TUZGBE —  MC7 Orals   (01-May-18   14:00—15:30)
Chair: G. Bisoffi, INFN/LNL, Legnaro (PD), Italy
Paper Title Page
TUZGBE1
Development of a 15 T Model Dipole for a Very High Energy Hadron Collider  
 
  • A.V. Zlobin
    Fermilab, Batavia, Illinois, USA
 
  The U.S. Magnet Development Program (MDP) is developing advanced accelerator magnet technology for future hadron colliders. In this context, a 15 T Nb3Sn dipole is being built and tested at Fermilab. This invited talk presents and discusses magnet design features and results including quench performance and magnetic measurements.  
slides icon Slides TUZGBE1 [13.540 MB]  
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TUZGBE2 Final-focus Superconducting Magnets for SuperKEKB 1215
 
  • N. Ohuchi, K.A. Aoki, Y. Arimoto, M.K. Kawai, T. Kawamoto, H. Koiso, Y. Kondo, M. Masuzawa, A. Morita, S. Nakamura, Y. Ohnishi, Y. Ohsawa, T. Oki, H. Sugimoto, K. Tsuchiya, R. Ueki, X. Wang, H. Yamaoka, Z.G. Zong
    KEK, Ibaraki, Japan
  • M. Anerella, J. Escallier, A.K. Jain, A. Marone, B. Parker, P. Wanderer
    BNL, Upton, Long Island, New York, USA
  • J. DiMarco, T.G. Gardner, J.M. Nogiec, M.A. Tartaglia, G. Velev
    Fermilab, Batavia, Illinois, USA
  • T.-H. Kim
    Mitsubishi Electric Corp, Advanced Technology R & D Center, Hyogo, Japan
 
  The SuperKEKB collider aims at 40 times higher luminosity than that achieved at KEKB, based on the nano-beam scheme. The vertical beta function at the interaction point will be squeezed to 300μmeter. Final-focus superconducting magnet system which consists of eight main quadrupole magnets, 43 corrector windings, and compensation solenoids is a key component to achieve high luminosity. This invited talk presents the construction and commissioning of the final-focus magnet system.  
slides icon Slides TUZGBE2 [4.239 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUZGBE2  
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TUZGBE3 Towards Implementation of Laser Engineered Surface Structures for Electron Cloud Mitigation 1220
 
  • M. Sitko, V. Baglin, S. Calatroni, P. Chiggiato, B. Di Girolamo, E. Garcia-Tabares Valdivieso, M. Taborelli
    CERN, Geneva, Switzerland
  • A. Abdolvand, D. Bajek, S. Wackerow
    University of Dundee, Nethergate, Dundee, Scotland, United Kingdom
  • M. Colling, T.J. Jones, P.A. McIntosh
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
 
  The LHC operation has proven that the electron cloud could be a significant limiting factor in machine performance, in particular for future High Luminosity LHC (HL-LHC) beams. Electron clouds, generated by electron multipacting in the beam pipes, leads to beam instabilities and beam-induced heat load in cryogenic systems. Laser Engineered Surface Structures (LESS) is a novel surface treatment which changes the morphology of the internal surfaces of vacuum chambers. The surface modification results in a reduced secondary electron yield (SEY) and, consequently, in the eradication of the electron multipacting. Low SEY values of the treated surfaces and flexibility in choosing the laser parameters make LESS a promising treatment for future accelerators. LESS can be applied both in new and existing accelerators owing to the possibility of automated in-situ treatment. This approach has been developed and optimised for the LHC beam screens in which the electron cloud has to be mitigated before the HL-LHC upgrade. We will present the latest steps towards the implementation of LESS.  
slides icon Slides TUZGBE3 [1.830 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUZGBE3  
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TUZGBE4 Toward High-Power High-Gradient Testing of mm-Wave Standing-Wave Accelerating Structures 1224
 
  • E.A. Nanni, V.A. Dolgashev, A.A. Haase, J. Neilson, S.G. Tantawi
    SLAC, Menlo Park, California, USA
  • S. Jawla, R.J. Temkin
    MIT/PSFC, Cambridge, Massachusetts, USA
  • S. C. Schaub
    MIT, Cambridge, Massachusetts, USA
  • B. Spataro
    INFN/LNF, Frascati (Roma), Italy
 
  Funding: This work is supported in part by Department of Energy contract DE-AC02-76SF00515 (SLAC) and DE-SC0015566 (MIT).
We will preliminary testing results for single-cell accelerating structures intended for high-gradient testing at 110 GHz. The purpose of this work is to study the basic physics of ultrahigh vacuum RF breakdown in high-gradient RF accelerators. The accelerating structures consist of pi-mode standing-wave cavities fed with TM01 circular waveguide mode. We fabricated of two structures one in copper and the other in CuAg alloy. Cold RF tests confirm the design RF performance of the structures. The geometry and field shape of these accelerating structures is as close as practical to single-cell standing-wave X-band accelerating structures more than 40 of which were tested at SLAC. This wealth of X-band data will serve as a baseline for these 110 GHz tests. The structures will be powered with a MW gyrotron oscillator that produces microsecond pulses. One megawatt of RF power from the gyrotron may allow us to reach a peak accelerating gradient of 400 MeV/m.
 
slides icon Slides TUZGBE4 [4.648 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUZGBE4  
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TUZGBE5 A Combined Temperature and Magnetic Field Mapping System for SRF Cavities 1228
 
  • J.M. Köszegi, K. Alomari, J. Knobloch, O. Kugeler, B. Schmitz
    HZB, Berlin, Germany
 
  In the past decade, a significant improvement of SRF cavity performance has been achieved, yet a number of performance limiting mechanisms, such as magnetic flux trapping, still exist. We present a diagnostics tool which combines flux expulsion measurement during the superconducting phase transition with temperature mapping during operation. This system has a time resolution for both temperature and magnetic field mapping of 2 ms for full cavity coverage, so that short-lived events, including cavity quenches, can easily be resolved.  
slides icon Slides TUZGBE5 [1.363 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUZGBE5  
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