07 Accelerator Technology
T11 Power Supplies
Paper Title Page
WEXGBF1 Testing of the ESS MB-IOT Prototypes 1759
  • M. Jensen
    ESS, Lund, Sweden
  • C. Bel, A. Beunas, D. Bussiere, P. Cacheux, V. Hermann, J.C. Racamier, C. Robert
    TED, Thonon, France
  • M. Boyle, H. Schult
    L-3, Williamsport, Pennsylvania, USA
  • G. Cipolla, E. Montesinos, M.S.B. Sanchez Barrueta
    CERN, Geneva 23, Switzerland
  • T. Kimura, P.E. Kolda, P. Krzeminski, L. Kurek, S. Lenci, O.S. Sablic, L. Turek, C. Yates
    CPI, Palo Alto, California, USA
  • M.F. Kirshner
    LANL, Los Alamos, New Mexico, USA
  • R.D. Kowalczyk, A.V. Sy, B.R. Weatherford
    SLAC, Menlo Park, California, USA
  • A. Zubyk
    L3 EDD, Williamsport, USA
  ESS is considering the use of MB-IOTs for parts of the high-beta linac. Two prototypes have been built by indus-try, namely L3 and CPI/Thales and have passed the factory acceptance test with excellent results. Both tubes will go through further extensive testing at CERN for ESS follow-ing delivery and a final decision on tube technology will be taken in April 2018. This invited talk presents the back-ground for the technical decision of IOTs vs klystrons, associated impact for ESS, and latest plans for industrial production of these IOTs for ESS.  
slides icon Slides WEXGBF1 [9.840 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEXGBF1  
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WEPMF008 Preliminary Designs and Test Results of Bipolar Power Supplies for APS Upgrade Storage Ring 2381
  • J. Wang, I.A. Abid, R.T. Keane, G.S. Sprau
    ANL, Argonne, Illinois, USA
  Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
The upgrade (APS-U) of the APS storage ring requires more than 1200 bipolar power supplies. Based on the performance requirement, the power supplies can be divided into two categories: fast bipolar power supplies for fast correctors and slow bipolar power supplies for trim coils and slow correctors. The common requirement of the power supplies is a bipolar output current up to ±15 A. The main difference is that the fast corrector power supplies require a small-signal bandwidth of 10 kHz. A prototype DC/DC power converter utilizing a MOSFET H-bridge circuit with a 500 kHz PWM was successfully developed through the R&D program, achieving the required bandwidth with less than 3-dB attenuation for a signal 0.5% of ±15 A. After the successful R&D program, the preliminary designs were performed to further improve the performance and to finalize the schematics, the PCB layouts, and the power supply constructions. The two types of the power supplies share the majority of the designs and features, with minor differences for the different bandwidth requirement. This paper presents the preliminary design, the key power supply functions and features, and the test results.
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPMF008  
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WEPMF072 Magnet Power Supplies for ALS-U 2538
  • G.C. Pappas, J.-Y. Jung, C.A. Swenson
    LBNL, Berkeley, California, USA
  The ALS-U project is an upgrade to the existing Advanced Light Source at Lawrence Berkeley Laboratory to a diffraction limited light source. To be able to achieve the small horizontal emittance of the ALS-U, the three bend achromats in the ALS will be replaced with nine bend achromats. Because the lifetime of the ALS-U beam will be significantly reduced, the plan is to use a swap out injection scheme between the storage ring and a new accumulator ring. The present plan is to use individual power supplies for each magnet in the storage ring, and series connected magnet strings for the accumulator ring. The sheer number of supplies needed, along with the tighter stability requirements for the ALS-U, is demanding in terms of the power supply requirements for stability and reliability. This paper will discuss the ALS-U magnet power supply requirements, and possible options to meet them.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPMF072  
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WEPML070 The Status of the CSNS/RCS Power Supply System 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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THPAL049 Power Supply Decoupling Design 3751
  • Y.T. Li, F.Y. Chang
    NSRRC, Hsinchu, Taiwan
  After an actual operation of the phase-shifted magnet's power supply was conducted, it was found that the currents in the two modules of magnets would be coupled each other. In order to solve this mutual coupling current, a decoupling controller is designed. From the experiment results indicate that it does not only solve the issue of coupling current but also shorten the rising time of the power supply current. This helps to increase the power supply bandwidth.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL049  
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THPAL054 Modification of a Power Supply for Low-Alpha Operation in the Taiwan Photon Source 3766
  • Y.S. Wong, Huang, J.C. Huang, C.Y. Liu, K.-B. Liu, B.S. Wang
    NSRRC, Hsinchu, Taiwan
  In this paper we describe the modifications of power supplies needed to operate the storage ring with a low momentum compaction factor (low alpha) to generate short x-ray pulses. This design includes an external polarity reversal circuit in quadrupole and sextupole magnet power supplies. The polarity reversal circuit contains four relay module where each relay can receive signals from the D-type analog interface. The power supply control system must be enhanced to switch output polarity. The operating principle and analyses of polarity reversal are discussed in more detail. Finally, a prototype polarity reversal circuit with 30 V, 250 A and 7.5 kW output power is implemented in the laboratory to verify the expected performance for the TPS low alpha operation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL054  
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THPAL055 A Novel High Step-down DC-DC Converter with Isolated Transformer and Switched Capacitor Techniques for Corrector Magnet Bulk Power in Taiwan Photon Source 3769
  • Y.S. Wong, K.-B. Liu
    NSRRC, Hsinchu, Taiwan
  • J.F. Chen
    NCKU, Tainan city, Taiwan
  In this study, a high step down DC-DC converter was successfully integrated using switch capacitor and isolated transformer techniques. Switching capacitor techniques has use of capacitor parallel energy storage and series release of the way to improve the voltage conversion ratio. In addition, the output voltage ripple will be smaller due to the input current being continuous, the inductance is an element to prevent a surge current. The isolated transformer techniques has use of inductor coil turns ratio to achieve high conversion ratio. But, the leakage inductor and parasitic capacitance on the power switch will be resonant to generate a surge voltage spike when the power switch S is turned off. So that, additional a passive clamp circuit, energy of leakage inductor will be recycled to clamp capacitor and voltage stress of main power switch. The power switch S can be selected a lower Rds(on) components and reduce the conduction losses to improve power converter efficiency. Step down mode operation principle and steady-state analysis were discussed in this paper. Finally, simulation and prototype circuit is implemented in this laboratory to verify the performance, the step-down DC-DC converter is input voltage 400-V, output voltage 48-V and output power 960-W.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL055  
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THPAL062 The New 20 kA 80 V Power Supply for the 520 MeV H Cyclotron at TRIUMF 3792
  • S. Carrozza, L. Bondesan, A. Morato, M.P. Pretelli, G.T. Taddia
    OCEM, Valsamoggia, Italy
  • M.C. Bastos, J.-P. Burnet, G. Hudson, Q. King, G. Le Godec, O. Michels
    CERN, Geneva, Switzerland
  • Y. Bylinskii, A.C.M. Leung, W. L. Louie, F. Mammarella, R.B. Nussbaumer, C. Valencia
    TRIUMF, Vancouver, Canada
  The new 20 kA, 80 V power supply for the main magnet of the 520 MeV H Cyclotron at TRIUMF was awarded to OCEM. It has replaced the original system (commissioned in 1976) based on a series pass regulator. The final acceptance tests have demonstrated the com-pliance with the project specifications, especially for the high current stability required for the Cyclotron operation. The current stability is ±5 ppm, including current ripple, for a period of more than 8 hours of continuous operation. In addition, the magnetic field can be further stabilized us-ing feedback of a flux loop signal. OCEM designed the power supply to use the third gen-eration of Function Generator/Controller (FGC3) control electronics from CERN. This was chosen to obtain the high current stability required by TRIUMF. This collaboration was facilitated through a Knowledge Transfer agreement between CERN and OCEM. The power supply commis-sioning has been performed as a collaboration between OCEM, TRIUMF and CERN. This paper describes the topology of the power supply, the control electronics, the high-precision current measure-ment system and the associated software as well as the commissioning results carried out with the magnet.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL062  
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THPAL083 A Test Facility for Developments in Ion Source Plasma Power Supplies 3845
  • R.E. Abel, D.C. Faircloth, S.R. Lawrie, J.H. Macgregor, M. Perkins
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  A new test facility is being designed and constructed at the ISIS spallation neutron source, Rutherford Appleton Laboratory, for the purpose of developing and experimenting with new plasma power supply topologies and modes of operation. The test facility will allow better control of power supply parameters such as discharge pulse current and plasma ignition voltage along with the possibility for closed loop feedback control. The design and technical construction details are presented with an overview of the plasma power supply developments.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL083  
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THPML124 Design of Beam Position Fast-Correction Magnet Power Supply for HALS 4967
SUSPL082   use link to see paper's listing under its alternate paper code  
  • Z.X. Shao, H. Gao, L. Wang, H.Y. Zhang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  Funding: Supported by 'Hefei Advanced Light Source Pre-research Project'
Hefei Advanced Light Source (HALS) is the fourth-generation radiation light source that is being pre-researched in China. Ultra-low emittance of the beam requires higher performance of power supply system. We designed a fast correcting power supply for the beam measurement needs. We adopted the all-digital method, the current closed-loop feedback used the AD7766 with 24-bit resolution as its A/D converter. And we added the corresponding constant temperature control, chain protection, etc. The small-signal frequency response of this system can reach more than 5kHz. The detail design scheme is described in this paper.
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML124  
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