Keyword: neutron
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MOPML047 Diversified Application of ILC photon, scattering, FEL, electron 502
 
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • T. Hayakawa
    QST, Tokai, Japan
  • N. Kawamura, S. Makimura, K. Mishima, D. Nomura, K. Shimomura, S. Yamamoto, T. Yamazaki
    KEK, Ibaraki, Japan
 
  ILC will be a very powerful accelerator complex. It has not only the high power energetic electron beam but also positron and photon beams. In addition to these beams, large cryogenic plants are equipped together with various utility facilities. Some suggestions on the assumption of availability of ILC are offered from various fields. These discussions will be reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-MOPML047  
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MOPML050 A Massive Open Online Course on Particle Accelerators target, survey, radiation, synchrotron 512
 
  • N. Delerue, A. Faus-Golfe
    LAL, Orsay, France
  • M.E. Biagini
    INFN/LNF, Frascati (Roma), Italy
  • E. Bründermann, A.-S. Müller
    KIT, Eggenstein-Leopoldshafen, Germany
  • P. Burrows
    JAI, Oxford, United Kingdom
  • G. Burt
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • A. Cianchi
    Università di Roma II Tor Vergata, Roma, Italy
  • C. Darve, R.A. Yogi
    ESS, Lund, Sweden
  • V.V. Dmitriyeva, S.M. Polozov
    MEPhI, Moscow, Russia
  • J. Kvissberg
    Lund University, Lund, Sweden
  • P. Lebrun
    JUAS, Archamps, France
  • E. Métral, H. Schmickler, J. Toes
    CERN, Geneva, Switzerland
  • S.P. Møller
    ISA, Aarhus, Denmark
  • L. Rinolfi
    ESI, Archamps, France
  • A. Simonsson
    Stockholm University, Stockholm, Sweden
  • V.G. Vaccaro
    Naples University Federico II and INFN, Napoli, Italy
 
  Funding: European Union H2020 - ARIES Project
The TIARA (Test Infrastructure and Accelerator Research Area) project funded by the European Union 7th framework programme made a survey of provision of education and training in accelerator science in Europe highlighted the need for more training opportunities targeting undergraduate-level students. This need is now being addressed by the European Union H2020 project ARIES (Accelerator Research and Innovation for European Science and Society) via the preparation of a Massive Online Open Course (MOOC) on particle accelerator science and engineering. We present here the current status of this project, the main elements of the syllabus, how it will be delivered, and the schedule for providing the course.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-MOPML050  
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MOPML053 Mu*STAR Accelerator-Driven Subcritical Reactors Burning Spent Nuclear Fuel at Light-Water-Reactor Sites target, site, operation, SRF 524
 
  • R.P. Johnson, R.J. Abrams, M.A. Cummings, T.J. Roberts
    Muons, Inc, Illinois, USA
 
  This project will use modeling and simulation tools to optimize many aspects of the Mu*STAR design and begin to explore accident scenarios. At present we have a conceptual design of the accelerator, the reactor, the spallation target, and the fractional distillation to separate volatile fission products. Our GAIN project with ORNL is preparing a design of the Fuel Processing Plant that will convert spent nuclear fuel into the molten-salt fuel for Mu*STAR. This includes all of the nuclear components, but not such things as the turbine and generator, physical plant, control and monitoring systems, etc. We currently have basic simulations of the reactor neutronics, and a start at calculating the fuel evolution. These have used MCNP and ORIGEN, and initial results have been reported1. This project will support the use of additional neutronics and multi-physics codes, enabling a much more thorough analysis of the system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-MOPML053  
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MOPML056 Evidence of the Electron-Screened Oppenheimer Philips Reactions 162Er(d, n)163Tm or 162Er(p,γ)163Tm in Deuterated Materials Subjected to a Low-Energy Photon Beam electron, proton, experiment, target 533
 
  • T.L. Benyo, A. Chait, L.P. Forsley, M. Pines, V. Pines, B.M. Steinetz
    NASA Glenn Research Center, Cleveland, USA
 
  NASA GRC has investigated electron-screening of deuterated metals using MV electron linear accelerators (LINACs). GRC found that repeatable sub-threshold nuclear reactions may have occurred resulting in nuclear products observed via witness-material neutron activation using high purity germanium (HPGe) gamma spectroscopy and liquid scintillator spectroscopy. The suspected path of creation may be the result of electron-screened Oppenheimer-Phillips reactions or Mirror Oppenheimer-Phillips reactions. Evidence of 162Er(d, n)163Tm or 162Er(p,γ)163Tm has been shown with the appearance of gamma peaks coinciding with 163Tm with a published ' life of 22 minutes from samples containing deuterated erbium exposed to a photon beam. Both of these reactions are a variation of the Oppenheimer-Phillips nuclear reaction. Evidence of the reactions have been detected by an HPGe gamma detection system and witnessed within gamma spectra collected from deuterated materials subjected to a nominally 1.95 MeV photon beam. This paper describes the theory behind the proposed reactions, the experiments conducted at GRC, and the experimental evidence of the suspected creation of the 163Tm isotope.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-MOPML056  
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MOPML062 Accelerator Neutron Source for Boron Neutron Capture Therapy vacuum, proton, experiment, tandem-accelerator 550
 
  • S.Yu. Taskaev, D.A. Kasatov, A.N. Makarov, Y.M. Ostreinov, I.M. Shchudlo, I.N. Sorokin
    BINP SB RAS, Novosibirsk, Russia
  • T.A. Bykov
    Budker INP & NSU, Novosibirsk, Russia
  • Ya.A. Kolesnikov, A.M. Koshkarev, E.O. Sokolova
    NSU, Novosibirsk, Russia
 
  Funding: This study was carried out with a grant from the Russian Science Foundation (project No. 14-32-00006-P) with the support of the Budker Institute of Nuclear Physics and Novosibirsk State University.
A source of epithermal neutrons based on a vacuum-insulated tandem accelerator and a lithium target is developed for the technique of boron neutron capture therapy. A stationary proton beam of 2 MeV with a current of up to 5 mA was obtained in the accelerator. Neutron generation was performed and the flux and neutron spectrum were experimentally measured. A Beam Shaping Assembly was developed and manufactured, which makes it possible to form a therapeutic beam of neutrons to the greatest extent satisfying the requirements of BNCT. It was established that neutron irradiation of tumor cells of human glioma U251 and human glioblastoma T98G, previously incubated in a medium with boron, led to a significant suppression of their viability. Irradiation of mice with grafted human glioblastoma tumor led to their complete cure. In order to increase the beam parameters, the facility was equipped with a wire scanner OWS-30 (D-Pace, Canada; under the license of TRIUMF), a non-contact current sensor NPTC (Bergos, France), a FLIR T650SC infrared camera, an Optris CT Laser 3ML SF pyrometer (Optris, GmbH, Germany), cooled diaphragms with thermistors, telescopic beam receivers with thermoresistors, a new bushing insulator. Two new sources of negative hydrogen ions with a high current are being prepared, one of them is surface-plasma, the other is voluminous. The investigations established the effect of space charge and spherical aberration of lens on the ion beam transport, the dependence of the heating of the diaphragms of the electrodes and the size of the proton beam on the current of the injected beam of negative hydrogen ions and the pressure of the residual gas in the transport channel. The report describes the modernization of the accelerator, discusses the results of research, declares plans.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-MOPML062  
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MOPML063 In Situ Observations of Blistering of a Metal Irradiated with 2 MeV Protons proton, radiation, target, experiment 553
 
  • S.Yu. Taskaev, D.A. Kasatov, A.N. Makarov, I.M. Shchudlo
    BINP SB RAS, Novosibirsk, Russia
  • A. Badrutdinov, Y. Higashi, T. Miyazawa
    OIST, Onna-son, Okinawa, Japan
  • T.A. Bykov
    Budker INP & NSU, Novosibirsk, Russia
  • S.A. Gromilov
    Nikolaev IIC, Novosibirsk, Russia
  • Ya.A. Kolesnikov, A.M. Koshkarev, E.O. Sokolova
    NSU, Novosibirsk, Russia
  • H. Sugawara
    KEK, Ibaraki, Japan
 
  Funding: This study was carried out with a grant from the Russian Science Foundation (project No. 14-32-00006-P) with the support of the Budker Institute of Nuclear Physics and Novosibirsk State University.
A vacuum-insulated tandem accelerator was used to observe in situ blistering during 2-MeV proton irradiation of metallic samples to a fluence of up to 6.7 1020 cm2. Samples consisting of copper of different purity, tantalum, and tantalum-copper compounds were placed on the proton beam path and forced to cool. The surface state of the samples was observed using a CCD camera with a remote microscope. Thermistors, a pyrometer, and an infrared camera were applied to measure the temperature of the samples during irradiation. After irradiation, the samples were analyzed on an X-ray diffractometer, laser and electron microscopes. The present study describes the experiment, presents the results obtained and notes their relevance and significance in the development of a lithium target for an accelerator-based neutron source, for use in boron neutron capture therapy of cancer.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-MOPML063  
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TUPAF016 Increase of IPHI Beam Power at CEA Saclay rfq, proton, detector, target 694
 
  • F. Senée, F. Benedetti, E. Giner-Demange, A. Gomes, M. Oublaid
    CEA/DRF/IRFU, Gif-sur-Yvette, France
  • P. Ausset, M. Ben Abdillah, C. Joly
    IPN, Orsay, France
  • F. Belloni, B. Bolzon, N. Chauvin, M. Desmons, Y. Gauthier, C. Marchand, J. Marroncle, T. Papaevangelou, G. Perreu, O. Piquet, B. Pottin, Y. Sauce, J. Schwindling, L. Segui, O. Tuske, D. Uriot
    CEA/IRFU, Gif-sur-Yvette, France
  • F. Harrault, R. Touzery
    CEA/DSM/IRFU, France
 
  For the first time, in April 2016, the SILHI source produced a proton beam for IPHI RFQ. Due to several technical difficulties on the RFQ water cooling skid, a short RF power pulse (100 µs at the beginning until few hundred microseconds) is injected into the RFQ accelerates the high intensity proton beam up to 3 MeV. The repetition rate is tuned between 1 and 5 Hz. Under these conditions, the beam power after the RFQ is lower than 100 W. At the end of 2017, the 352 MHz RFQ conditioning has been completed (with the same duty cycle) and the proton beam has been accelerated. The increase of the beam power is expected to continue in 2018 in order to reach several kilowatts by the end of the year. In addition, two Ionization beam Profile Monitors (IPM) developed for ESS have been tested on the deviated beam line with a very low duty cycle. The IPHI facility should demonstrate the possibility to produce neutrons with a flexible compact accelerator in the framework of the SONATE project. This paper presents the status of the IPHI project in April 2018.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPAF016  
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TUPAF065 Opportunities and Challenges in Planning the Installation, Testing and Commissioning of Large Accelerator Facilities MMI, linac, DTL, target 878
 
  • D.C. Plostinar, D. Bergenholtz, H. Danared, L. Gunnarsson, M.I. Israelsson, A. Jansson, M. Lindroos, A. Sunesson, L. Tchelidze, J.G. Weisend
    ESS, Lund, Sweden
 
  Delivering major accelerator facilities requires complex project preparation, organisation and scheduling. Often, multiple factors have to be taken into account including technical, financial and political. This makes planning particularly difficult, but at the same time opens opportunities for improving and optimising the project prospects. In this paper, we discuss the major drivers governing the installation, testing and commissioning of major accelerators in general, with particular emphasis on the European Spallation Source (ESS) accelerator, currently under construction in Lund, Sweden.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPAF065  
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TUPAK013 Geant4 Simulation of Radiation Effect on the Deflector of Extraction System in HUST SCC250 septum, proton, radiation, simulation 990
 
  • S. Hu, K. Fan, L.X.F. Li, Z.Y. Mei, Z.J. Zeng, L.G. Zhang
    HUST, Wuhan, People's Republic of China
 
  China has payed extensive attention to the development of proton therapy in recent years. When design a compact, high energy superconducting cyclotron for proton therapy, radiation effect induced by beam losses is a crucial consideration. Since the proton beam is extracted out of HUST SCC250 by electrostatic deflectors, the fierce interaction between proton beam and the deflector septum is the main cause of beam losses, which will bring about radiation effect leading to activation and coil quench. This paper presents simulation results of radiation effect by utilizing Geant4 Monte Carlo code. The energy depositions of proton beam in various septum materials are compared. Meanwhile, the yields, the ener-gy and angular distributions of secondary particles are investigated. Those simulation results based on radiation effect will provide us with valuable implications for the design of this superconducting cyclotron.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPAK013  
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TUPAL001 Solvement of the Asynchronization Between the BPMs and Corrector Power Supplies During Orbit Correction in RCS of CSNS power-supply, MMI, software, proton 1008
 
  • M.T. Li
    CSNS, Guangdong Province, People's Republic of China
  • Y.W. An, M.Y. Huang
    IHEP, Beijing, People's Republic of China
 
  This paper proposes a new possible method to re-synchronize the BPM COD data and Corrector Supplies' data during orbit correction in RCS AC-mode beam commis-sioning of CSNS. This method is promising to improve the effect of the obit correction.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPAL001  
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TUPAL002 Numerical Calibration of the Injection Bump Sizes During the Beam Commissioning for CSNS injection, MMI, flattop, experiment 1011
 
  • M.Y. Huang, S. Wang, S.Y. Xu
    IHEP, Beijing, People's Republic of China
 
  In order to control the strong space charge effects, which cause large beam loss during the injection and acceleration processes, phase space painting method was used for injecting a small emittance beam from the linac into the large acceptance of the Rapid Cycling Synchrotron (RCS). During the beam commissioning, in order to control and optimize the painting results, the positions and ranges of the horizontal and vertical painting should be adjusted accurately. Therefore, the numerical calibration of the injection bump sizes was very important and need to be done as soon as possible. In this paper, a method to calibrate the horizontal and vertical bump sizes was presented and applied to China Spallation Neutron Source (CSNS). The numerical calibration results would be given and discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPAL002  
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TUPAL003 Measurement of the Injection Beam Parameters by the Multi-Wire Scanner for CSNS injection, proton, MMI, linac 1014
 
  • M.Y. Huang, H.C. Liu, S. Wang, Zh.H. Xu, P. Zhu
    IHEP, Beijing, People's Republic of China
  • X.H. Lu
    CSNS, Guangdong Province, People's Republic of China
 
  In order to inject the H beam to the Rapid Cycling Synchrotron (RCS) with high precision and high transport efficiency, the injection beam parameters need to be measured and then corrected while its eccentric position or direction angle is too large. In this paper, firstly, a method to measure the injection beam parameters by using two of the four multi-wire scanners (MWSs) is presented. The injection commissioning results confirmed that this method works well. Secondly, a method to measure the signals of injection beam and circular beam by the INMWS02 is presented and the method work well during the beam commissioning.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPAL003  
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TUPAL005 Study on the Fixed Point Injection during the Beam Commissioning for CSNS injection, MMI, timing, proton 1017
 
  • M.Y. Huang, H.C. Liu, S. Wang, S.Y. Xu
    IHEP, Beijing, People's Republic of China
 
  In order to inject the H beam into the Rapid Cycling Synchrotron (RCS) of China Spallation Neutron Source (CSNS) accurately, different injection methods were used in different periods of beam commissioning for CSNS. In the early stage of beam commissioning, since the precise relative position of the injection beam and circular beam was unknown and the injection beam power was relatively small, the fixed point injection method was used. In this paper, the fixed point injection method is studied in detail and the beam commissioning results are given and discussed. In addition, a method to adjust the timing of the injection pulse power is presented and confirmed by the beam commissioning.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPAL005  
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TUPAL010 Research on an Accelerator-Based BNCT Facility target, rfq, proton, DTL 1024
 
  • L. Lu, T. He, W. Ma, L.B. Shi, L.P. Sun, C.C. Xing, X.B. Xu, L. Yang
    IMP/CAS, Lanzhou, People's Republic of China
 
  Seven people have been diagnosed with cancer per minute in China, and cancer has been the leading cause of death with about one fourth of all deaths in China. As effective means and ways for cancer therapy, Boron Neutron Cancer Therapy (BNCT) has drawn greater attention. Accelerator based neutron source is a compact neutron source, and technologies of accelerating a high current beam has matured. We proposed an accelerator based BNCT (AB-BNCT), which can accelerate a 10 mA proton beam up to 7 MeV and target on a shelled-Beryllium. The dynamics of accelerators and neutron calculations will be reported in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPAL010  
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TUPAL021 Evaluation of Activated Nuclides Due to Secondary Particles Produced in Stripper Foil in J-PARC RCS proton, experiment, radiation, target 1048
 
  • M. Yoshimoto, S. Kato, M. Kinsho, K. Okabe, P.K. Saha, K. Yamamoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
 
  Multi-turn charge-exchange beam injection is key technique to achieve the high intensity proton beam accelerators. In the J-PARC RCS, 400MeV H beams from the LINAC are converted to H+ beam with the stripper foils, and then injected into the ring. The stripper foil is irradiated by not only the injecting H beams but also the circulating H+ beams. The high energy and high power beam irradiation into the foil induces the nuclear reactions, and generated secondary neutrons and protons. These secondary particles causes high residual does around the stripper foil. Now, to identify species of secondary particles and to identify energies and emission angles, activation analysis method using the sample pieces is considered. In this presentation, we report the result of the evaluation of this activation analysis with PHITS codes.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPAL021  
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TUPAL025 Preliminary Test of the Beam Transport System for Li-8 Production Target Ion Source target, beam-transport, proton, ion-source 1054
 
  • H.-J. Kwon, Y.-S. Cho, J.J. Dang, D.I. Kim, H.S. Kim, S. Lee, Y.G. Song, S.P. Yun
    Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
 
  Funding: This work has been supported by through KOMAC (Korea Multi-purpose Accelerator Complex) operation fund of KAERI by MSIT (Ministry of Science and ICT)
A prototype target ion source was developed in order to produce a radioactive beam such as Li-8 as a part of the goals to establish a platform for secondary particle production at KOMAC (Korea Multi-purpose Accelerator Complex). A beam transport system from the 100-MeV linac to prototype target ion source was designed and constructed. It consists of 8 quadrupole magnets, 2 bending magnets and beam diagnostic devices such as AC current transformers, beam position monitors, beam profile monitors and beam loss monitors. Details on the beam transport system and test results are presented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPAL025  
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TUPAL034 Effect of 805-MHz Linac RF Stability on Beam Losses in LANSCE High-Energy Beamlines beam-losses, linac, proton, operation 1078
 
  • Y.K. Batygin
    LANL, Los Alamos, New Mexico, USA
 
  Funding: Work supported by the United States Department of Energy, National Nuclear Security Agency, under contract DE-AC52-06NA25396.
Operation of an accelerator facility critically depends on stability of the field amplitudes and phases of the accelerating cavities. The LANSCE linear accelerator consists of a 201.25-MHz, drift-tube linac and an 805-MHz, side-coupled-cavity linac (SCL). Beam losses in the high-energy beamlines of the 800-MeV facility were measured versus variation of the amplitudes and phases of the 805-MHz, SCL, RF cavities. A recent study* confirms that to achieve low losses, the stability of the amplitudes and phases should be kept within 0.1% and 0.1o, respectively. This agrees with a previous study of beam losses in the 201.25-MHz linac. Details of the measurements and results are presented.
*L.J.Rybarcyk, R.C.McCrady, Proceeding of LINAC2016, East Lansing, MI, USA, MOPLR072, p.301.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPAL034  
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TUPAL041 Vacuum Accelerating Tube with Two Symmetrically Located Targets for Neutron Generation electron, cathode, target, plasma 1097
 
  • V.I. Rashchikov, A.A. Isaev, A.E. Shikanov
    MEPhI, Moscow, Russia
 
  Original neutron generator* on the base of pulse accelerating vacuum tube with two targets, symmetrically located on the both sides of deuteron source is discussed. Two immersion lenses in front of each other uses as accelerating and focusing systems. Lenses cathodes are Faraday cups with targets for neutron production on the bottom. Symmetric ring magnetic elements cover immersion lenses for correcting focusing conditions. Computer simulation allows us to choose electrodes geometry and accelerating pulse value for electron flow from ion-electron emission oscillate between the targets and provide device operate as reflective triode. Estimations of neutron flow and spatio-temporal neutron field structure are done.
* Patent RF N2467526, 14.06.2011
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPAL041  
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TUPAL042 On Possibility of Reflective Triode Uses for Thermonuclear Neutron Generation in Budker-Post Trap with Pulsed Magnetic Field plasma, proton, electron, focusing 1100
 
  • V.I. Rashchikov, A.N. Didenko, A.A. Isaev, K.I. Kozlovskiy, V.L. Shatokhin, A.E. Shikanov, E.D. Vovchenko
    MEPhI, Moscow, Russia
 
  Scheme for thermonuclear neutron generation in compact Budker-Post trap with barrel-shaped pulsed magnetic field produced by two symmetrically located thin coils with diameter not exceed 0.05 m is proposed. During neutron generation in the trap simultaneously forms plasma which include hydrogen nuclides with density up to 1013 m-3 and two pulsed counter hydrogen nuclides flows accelerated in the diodes. Diodes consist of transparent anode with the form of sphere sector symmetrically covered by the same form grounded cathode. Diodes located symmetrically in front of each other, coaxially to magnetic trap. Computer simulation shows possibility to generate up to 1010 neutrons per pulse for deuterium-tritium compound in the diode system with transverse dimension ~0.1 m, amplitude and accelerating pulse duration 5.105 V and 100 nsec. The value of magnetic induction in the center of the trap should be approximately equal to 20 T.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPAL042  
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TUPAL047 Strain Measurement in the Recent SNS Mercury Target with Gas Injection target, injection, proton, radiation 1117
 
  • Y. Liu, W. Blokland, C.D. Long, S.N. Murray, B.W. Riemer, R.L. Sangrey, M. W. Wendel, D.E. Winder
    ORNL, Oak Ridge, Tennessee, USA
 
  Funding: ORNL is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. DOE.
High-radiation-tolerant fiber-optic strain sensors were recently developed to measure the transient proton-beam-induced strain profiles on the mercury target vessel at the Spallation Neutron Source (SNS). Here we report the strain measurement results and radiation-resistance performance on the latest SNS mercury target vessel equipped with helium gas injection. The results have demonstrated the efficacy of gas injection to reduce the cyclic stress on the target module.
 
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TUPAL052 Multi-Physics Analysis of a CW IH-DTL for CIFNEF DTL, cavity, linac, operation 1129
 
  • Q.Y. Tan, M.J. Easton, Q. Fu, P.P. Gan, H.P. Li, Y.R. Lu, Z. Wang
    PKU, Beijing, People's Republic of China
 
  The Compact Intense Fast NEutron Facility (CIFNEF) project aims to produce high intense neutrons via the 7Li (d, n) 8Be reaction using a 5 MeV, 10 mA deuteron linac. The main components of the linac are an ion source, a short radio frequency quadrupole (RFQ) and an interdigi-tal H-mode drift tube linac (IH-DTL). The IH-DTL will accelerate the continuous wave (CW) deuteron beam from 1 MeV to 5 MeV with a total cavity length of 1.25 m using Kombinierte Null Grad Struktur (KONUS) design, achieving an accelerating gradient of 3.2 MV/m. The RF power loss for the whole cavity is estimated to be 85 kW. This high power loss is a significant challenge to the cooling design, as it could cause large rises in tempera-ture, thermal deformation and frequency drift. A detailed multi-physics analysis of the CW IH-DTL is presented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPAL052  
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TUPML068 The European Spallation Source Neutrino Super Beam Design Study proton, detector, linac, target 1702
 
  • M. Dracos
    IPHC, Strasbourg Cedex 2, France
 
  Funding: This project is now supported by the COST Action CA15139/EuroNuNet and EU/H2020 innovation programme ESSnuSB under grant agreement No 777419.
ESSnuSB proposes to use the proton linac of the European Spallation Source (ESS) currently in construction in Lund (Sweden) to produce a very intense neutrino super beam, in parallel with the spallation neutron production. The ESS linac is expected to be operational by 2023 delivering 5 MW average power, 2 GeV proton beam, with 2.86 ms long pulses at a rate of 14 Hz. The primary proton beam-line completing the linac will consist of an accumulator ring to compress the beam pulses to 1.3 µs and a switchyard to distribute the protons onto the target station. The secondary beam-line producing neutrinos will consist of a four-horn/target station, a decay tunnel and a beam dump. A megaton scale water Cherenkov detector will be located at a baseline of about 500 km in one of the existing mines in Sweden and it will measure the neutrino oscillations. ESSnuSB was recently granted by the European H2020-INFRADEV program to start beginning of 2018 a 4-year design study on the feasibility of such facility. This paper presents the objectives, the steps and the organization of the ESSnuSB DS.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPML068  
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TUPML076 Installation, Commissioning and Characterization of EBIS-SC as a Short Pulsed Proton Source at KOMAC extraction, electron, proton, MMI 1721
 
  • S. Lee, Y.-S. Cho, H.S. Kim, H.-J. Kwon
    Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
 
  Funding: This work has been supported through KOMAC operation fund of KAERI by MSIT (Ministry of Science and ICT)
Neutron source is applicable to various fields in basic/applied science and industries. There are several neutron sources in the world such LENS, SNS, J-PARC, ISIS and ESS either for short or long pulsed neutron. At Korea Multipurpose Accelerator Complex (KOMAC), to provide wide ranges of research opportunities to beam user, a 100 MeV proton linac based pulsed neutron source is planned for both long and short pulses of neutron source. Currently, the 100 MeV proton linac is operational with a 2 ms long pulsed proton injector, i.e. a microwave ion source. We will upgrade our injector by combining the already existing microwave ion source with a EBIS-SC (Superconducting Electron Beam Ion Source from Dreebit GmbH) for short pulses (< 1 us) of proton. This planned injector will work one at the time and provide long/short pulses of accelerated proton hitting a target to emit correspondingly long/short neutron pulses. Main modification on the proton injector is the EBIS-SC, so in this paper we report the installation, and commission of the EBIS-SC test bench at KOMAC. And the characterization of the EBIS-SC is described in detail.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPML076  
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WEYGBD3 The CERN Gamma Factory Initiative: An Ultra-High Intensity Gamma Source photon, factory, electron, positron 1780
 
  • M.W. Krasny
    LPNHE, Paris, France
  • R. Alemany-Fernández, H. Bartosik, N. Biancacci, P. Czodrowski, B. Goddard, S. Hirlaender, J.M. Jowett, R. Kersevan, M. Kowalska, M.W. Krasny, M. Lamont, D. Manglunki, A.V. Petrenko, M. Schaumann, C. Yin Vallgren, F. Zimmermann
    CERN, Geneva, Switzerland
  • P.S. Antsifarov
    Institute of Spectroscopy, Russian Academy of Science, Troitsk, Moscow, Russia
  • A. Apyan
    ANSL, Yerevan, Armenia
  • E.G. Bessonov
    LPI, Moscow, Russia
  • J. Bieron, K. Dzierzega, W. Placzek, S. Pustelny
    Marian Smoluchowski Institute of Physics, Jagiellonian University, Kraków, Poland
  • D. Budker
    Johannes Gutenberg University Mainz, Institut für Physik, Mainz, Germany
  • K. Cassou, I. Chaikovska, R. Chehab, K. Dupraz, A. Martens, Z.F. Zomer
    LAL, Orsay, France
  • F. Castelli
    Università degli Studi di Milano, Milano, Italy
  • C. Curatolo, L. Serafini
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  • K. Kroeger
    FSU Jena, Jena, Germany
  • V. Petrillo
    Universita' degli Studi di Milano & INFN, Milano, Italy
  • V.P. Shevelko
    LPI RAS, Moscow, Russia
  • T. Stöhlker
    HIJ, Jena, Germany
  • G. Weber
    IOQ, Jena, Germany
  • Y.K. Wu
    FEL/Duke University, Durham, North Carolina, USA
  • M.S. Zolotorev
    LBNL, Berkeley, California, USA
 
  This contribution discusses the possibility of broadening the present CERN research programme making use of a novel concept of light source. The proposed, Partially Stripped Ion beam driven, light source is the backbone of the Gamma Factory (GF) initiative. It could be realized at CERN by using the infrastructure of the already existing accelerators. It could push the intensity limits of the presently operating light-sources by up to 7 orders of magnitude, reaching fluxes of 1017 photons/s in the interesting gamma-ray energy domain between 1 MeV and 400 MeV. The GF light-source cannot be replaced, in this energy domain, by a FEL source as long as the multi TeV electron beams are not available. Its intensity is beyond the reach of the Inverse Compton Scattering sources. The unprecedented-intensity, energy-tuned gamma beams, together with the gamma-beams-driven secondary beams of polarized leptons, neutrinos, neutrons and radioactive ions are the basic research tools of the proposed Gamma Factory. A broad spectrum of new opportunities, in a vast domain of uncharted fundamental and applied physics territories, could be opened by the Gamma Factory research programme.  
slides icon Slides WEYGBD3 [7.537 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEYGBD3  
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WEPAL055 TPS Beam Trip Analysis and Dose Distribution radiation, kicker, SRF, storage-ring 2302
 
  • B.Y. Chen, F.Y. Chang, S. Fann, C.S. Huang, C.H. Kuo, T.Y. Lee, C.C. Liang, W.Y. Lin, Y.C. Lin, Y.-C. Liu
    NSRRC, Hsinchu, Taiwan
 
  Failure analysis during TPS users operation is im-portant to improve the performance of the TPS storage ring. In this report, we discuss the particular radiation dose patterns, relevant to different beam trips, and the development of a tool to help us analyse this dose distri-bution. We will use this analysing tool to train our ability for future failure analysis to shorten the time it takes to find the problem.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPAL055  
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WEPMF032 Experimental Studies on Secondary Electron Emission Characteristics for Chamber Materials of Accelerators electron, experiment, detector, vacuum 2425
 
  • Y. Jiao, Z. Duan, W.B. Liu, Y.D. Liu
    IHEP, Beijing, People's Republic of China
  • Liu. S. Liu
    Institute of High Energy Physics (IHEP), People's Republic of China
  • P.C. Wang
    DNSC, Dongguan, People's Republic of China
 
  Funding: National Natural Science Foundation of China (11275221) and Key Laboratory Foundation of Particle Acceleration Physics &Technology (Y5294106TD)
Secondary electron emission (SEE) of surface is origin of multipacting effect which could seriously deteriorate beam quality and even perturb the normal operation of particle accelerators. Experimental measurements on secondary electron yield (SEY) on different materials and coating have been developed in many accelerator laboratory. In fact, the SEY is just one parameter of secondary electron emission characteristics which include spatial and energy distribution of emitted electrons. A novel experimental apparatus was set up in China Spallation Neutron Source (CSNS) and innovative measurement methods were applied to obtain the whole characteristics of SEE. With some traditional accelerator chamber materials such as Cu, Al, TiN, SEY dependence on primary electron energy and beam injection angle, spatial and energy distribution of emitted secondary electrons were achieved with this measurement apparatus. This contribution also tries to give all the experimental results a reasonable theoretical analysis.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPMF032  
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WEPMF084 Design, Prototyping Activities and Beam Irradiation Test for the New nTOF Neutron Spallation Target target, interface, proton, radiation 2582
 
  • R. Esposito, M. Bergeret, J. Busom, M.E.J. Butcher, M. Calviani, R. Cimmino, T. Coiffet, J.P.C. Espadanal, L. Gentini, R. Illan Fiastre, V. Maire, F. Ogallar Ruiz, A. Perillo-Marcone, S. Sgobba, M.A. Timmins, C. Torregrosa, E. Urrutia, V. Vlachoudis
    CERN, Geneva, Switzerland
  • R. Logé
    EPFL, Lausanne, Switzerland
 
  A third-generation neutron spallation target for the neutron time-of-flight facility at CERN (nTOF) is currently undergoing the design and prototyping stage. The new design aims at improving reliability, increasing beam intensity on target and avoiding issues encountered in the current generation target, in particular the contamination of the cooling system water with radioactive spallation products coming from washing out lead. After a preliminary design and an initial prototyping stage*, a baseline solution has been defined consisting in a pure lead target core contained in a Ti-6Al-4V cladding and embedded in a massive Pb block. A backup solution has also been defined, consisting in a Ta-cladded W core embedded in a Pb block. Both solutions are currently undergoing the detailed design stage. This contribution details the prototyping activity, the robustness studies for accidental scenarios and the design of a beam irradiation test on prototypes of the target core.
R. Esposito et al., "Design of the new CERN nTOF neutron spallation target: R&D and prototyping activities," in Proc. of IPAC'17, Copenhagen, May 2017.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPMF084  
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WEPML070 The Status of the CSNS/RCS Power Supply System power-supply, dipole, network, resonance 2850
 
  • X. Qi, Z. Hao, W. Zhang
    IHEP, Beijing, People's Republic of China
 
  The 1.6GeV proton synchrotron proposed in the CSNS Project is a 25Hz rapid-cycling synchrotron (RCS) with injection energy of 80MeV. Beam power is aimed to 100kW at 1.6GeV. In this year, the neutron beam was successfully obtained for the first time. This paper will introduce the commission statues of RCS Power Supply System status in the last year.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML070  
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WEPML072 Gas Permeability Measurement of Graphene Films vacuum, background, experiment, detector 2856
 
  • P.C. Wang, X. Sun
    DNSC, Dongguan, People's Republic of China
  • Liu. S. Liu
    Institute of High Energy Physics (IHEP), People's Republic of China
  • C. Meng, H. Wang, D.H. Zhu
    IHEP, Beijing, People's Republic of China
 
  Graphene has extremely high strength and thermal conductivity, which can possibly be used for high-power beam window in accelerator. In this paper, gas permeabilities of different graphene films have been measured by the permeation measurement facility. According to the results, the possibility of the graphene-made beam windows will be discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML072  
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THPAK068 Fringe Field Effect of Solenoids solenoid, optics, quadrupole, ECR 3385
 
  • T.V. Gorlov, J.A. Holmes
    ORNL, Oak Ridge, Tennessee, USA
 
  Funding: This work has been supported by Oak Ridge National Laboratory, man-aged by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy.
We derive a precise analytical nonlinear transverse map for single particle transport through a solenoid with hard edge fringe fields. The transfer map is two dimensional for transverse coordinates and momenta with fixed longitudinal momentum. Because it is an accurate analytic map, it is also symplectic. The transfer map is compared with ex-act numerical tracking.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAK068  
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THPAL022 Precision Magnet Measurements for Deuteron Beam Transport quadrupole, dipole, multipole, alignment 3670
 
  • R.A. Marsh, D.J. Gibson, B. Rusnak
    LLNL, Livermore, California, USA
 
  Funding: This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
A versatile 4 MeV and 7 MeV deuteron beam transport line is being developed at Lawrence Livermore National Laboratory in support of an accelerator-driven source for fast neutron imaging. The beamline design requires precise alignment and high quality quadrupole magnets to transport a low emittance beam to the target through diagnostics, a bending dipole, and a differential pumping line with minimum beam loss and emittance growth. Vector magnetic field measurements of these magnets have been completed using a mobile version of an existing magnet mapping capability. This magnet mapping system is being used to ensure the delivered magnets meet the field uniformity specification, and that the mountings are aligned and capable of reaching the specified alignment tolerances. Details of the magnet measurement and calibration process that enable accurate field measurements to represent the intrinsic magnet field quality and not the systematic error of the measurement setup are presented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL022  
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THPAL023 Assessing the Continued Suitability of an Existing Water System for an Accelerator Upgrade operation, simulation, interface, HOM 3673
 
  • W.C. Barkley, C.E. Buechler, E.N. Pulliam
    LANL, Los Alamos, New Mexico, USA
 
  This paper assesses the continued suitability of an existing Water Cooling System (WCS) for cooling intermediate and high-power RF power amplifiers at the Los Alamos Neutron Science Center (LANSCE). At LANSCE, the high-power and intermediate power amplifiers installed in the 70s were at end-of-life with obsolete parts and no suitable replacements available to extend their life. The LANSCE Refurbishment Project was initiated (now complete) to replace these amplifiers and to utilize already existing WCSs. Two existing WCSs were repurposed and one new WCS was designed and installed. Unscheduled, intermittent water system trips on one of the WCSs has prompted the engineering group to drill down into the original decision, build a flow model and assess some of the legacy components' suitability to solve the problem. This paper discusses the general approach, troubleshooting and solution recommendations to be made for resolution of the intermittent issues.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL023  
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THPAL070 Multi-Physics Analysis of Two Bunchers for CIFNEF cavity, simulation, beam-transport, target 3815
 
  • Q.Y. Tan, M.J. Easton, Q. Fu, P.P. Gan, H.P. Li, Y.R. Lu, Z. Wang
    PKU, Beijing, People's Republic of China
 
  CIFNEF(Compact Intense Fast NEutron Facility) project will accelerate and deliver a 5 MeV deuteron beam to the targets to produce high-intense neutrons. A 2.5 MHz pulsed deuteron beam with bunch width within 2 ns is needed on the targets at last. To fulfill the special requirements of the beam dynamics, two types of bunchers are adopted in the CIFNEF. One is a 10.156 MHz buncher used in the low energy beam transport (LEBT) line to longitudinally focus the 50 keV deuteron beam to the RFQ longitudinal acceptance with 4 kV effective voltage. A lumped element model is adopted because of the low frequency and it consists of an inductance coil in parallel with the capacitance of drift tube. The other one is an 81.25 MHz buncher used in the high energy beam transport (HEBT) line to longitudinally focus the 5 MeV deuteron beam to 2 ns. A QWR cavity with 2-gaps is used to provide 150 kV effective voltage. Thermal and structural analyses have been carried out on these two bunchers. Details of simulations of these two bunchers are presented and discussed in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL070  
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THPAL117 Development of a Proton-to-Neutron Converter for Radioisotope Production at ISAC-TRIUMF target, proton, ISAC, TRIUMF 3917
 
  • L. Egoriti, P.G. Bricault, T. Day Goodacre, A. Gottberg
    TRIUMF, Vancouver, Canada
  • M. Delonca, R.M. Dos Santos Augusto, J.P. Ramos, S. Rothe, T. Stora
    CERN, Geneva, Switzerland
  • M. Dierckx, D. Houngbo, L. Popescu
    SCK•CEN, Mol, Belgium
  • R.M. Dos Santos Augusto
    LMU, München, Germany
 
  At ISAC-TRIUMF, a 500 MeV proton beam is impinged upon thick targets to induce nuclear reactions to pro-duce reaction products that are delivered as a Radioactive Ion Beam (RIB) to experiments. Uranium carbide is among the most commonly used target materials which produces a vast radionuclide inventory coming from both spallation and fission- events. This can also represent a major limitation for the successful delivery of certain RIBs to experiments since, for a given mass, many isobar-ic isotopes are to be filtered by the dipole mass separator. These contaminants can exceed the yield of the isotope of interest by orders of magnitude, often causing a significant reduction in the sensitivity of experiments or even making them impossible. The design of a 50 kW proton-to-neutron (p2n) converter-target is ongoing to enhance the production of neutron-rich nuclei while significantly reducing the rate of neutron-deficient contaminants. The converter is made out of a bulk tungsten block which converts proton beams into neutrons through spallation. The neutrons, in turn, induce pure fission in an upstream UCx target. The present target design and the service infrastructure needed for its operation will be discussed in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL117  
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THPML020 The First Results of Trial Operation and Performance Improve of the 100 MeV/ 100 kW Electron Linear Accelerator of the NSC KIPT SCA Neutron Source electron, gun, MMI, operation 4693
 
  • A.Y. Zelinsky, O.E. Andreev, V.P. Androsov, O. Bezditko, O.V. Bykhun, A.N. Gordienko, V.A. Grevtsev, A. Gvozd, V.E. Ivashchenko, I.I. Karnaukhov, I.M. Karnaukhov, V.P. Lyashchenko, M. Moisieienko, A.V. Reuzayev, D.V. Tarasov, V.I. Trotsenko
    NSC/KIPT, Kharkov, Ukraine
  • Y.L. Chi
    IHEP, Beijing, People's Republic of China
 
  The NSC KIPT SCA Neutron Source uses 100 MeV/ 100 kW electron linear accelerator as a driver for the generation of the initial neutrons. The trial operation of the accelerator was started in 2018. To provide design electron beam parameters is the primary task of the first stage of the trial operation. During the first stage of the accelerator operation the following tasks were under consideration: minimization of the electron beam losses along accelerator, providing of the stable electron beam pulse current, adjustment of the electron beam position along accelerator and providing of the uniform electron beam distribution at the tungsten neutron generating target. The main results of the accelerator operation and methods of performance improve are described in the paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML020  
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THPML021 Individual Acceptance Testing and Comprehensive Testing of NSC KIPT SCA Neutron Source Technological Systems and Equipment target, detector, electron, MMI 4696
 
  • A.Y. Zelinsky, O.V. Bykhun, I.M. Karnaukhov, A. Mytsykov, I. Ushakov
    NSC/KIPT, Kharkov, Ukraine
  • I. Bolshinsky
    INL, Idaho Falls, Idaho, USA
  • Y. Gohar
    ANL, Argonne, Illinois, USA
 
  During 2016-2017 the installation, assembling and commissioning of the NSC KIPT SCA Neutron Source technological systems were completed. The facility was designed and developed by NSC KIPT of Ukraine in collaboration with ANL of USA. The construction of the neutron source facility was started in 2012. The neutrons of the subcritical assembly are generated by 100 MeV/ 100 kW electron beam uniformly distributed at the surface of the tungsten target. It is supposed that the facility will be used to perform basic and applied nuclear research, produce medical isotopes, and train nuclear specialists. The individual acceptance testing and comprehensive testing were conducted for the technological and engineering systems of the neutron source. The tests were performed in compliance with programs and methodologies agreed by the State Nuclear Regulatory Inspectorate of Ukraine. The testing results confirmed compliance of the equipment with technical specifications, standards, regulations and rules on nuclear and radiation safety and preparedness of these systems for trial operation with the KIPT neutron source. The trial operation of the NSC KIPT SCA 'Neutron Source' has been started.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML021  
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