Keyword: power-supply
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MOPMB050 Design of Ultra-wideband Amplifier in RF Front End for Bunch-by-bunch Measurement simulation, impedance, experiment, synchrotron-radiation 205
 
  • Y. Yang, Y.B. Leng, Y.B. Yan
    SSRF, Shanghai, People's Republic of China
  
  RF front end is one of the key technologies in beam diagnosis, especially in bunch-by-bunch measurement at storage ring. This paper gives the design of ultra-wideband amplifier in RF front end for bunch-by-bunch measurement at SSRF. Simulation have been done to verify the performance of this design.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB050  
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MOPMR058 Precise Beam Orbit Response Measurement with AC Excitation feedback, electronics, network, storage-ring 380
 
  • W.X. Cheng, K. Ha, Y. Tian, L.-H. Yu
    BNL, Upton, Long Island, New York, USA
  
  Fast correctors at NSLS-II storage ring has broad frequency response (~1kHz bandwidth), together with high accurate BPM 10kHz data makes the broadband fast orbit feedback realistic. With integrated NCO, beam orbit response can be precisely measured while driving the electron beam with AC current. Compared to the normal DC orbit response measurement, this method eliminates the measurement errors due to orbit drift. Accurately measured orbit response matrix can be used to characterize the machine lattice. Fast corrector frequency responses have been measured using the same method, by scanning the excitation frequency. This information can be used to optimize the fast orbit feedback control loop.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR058  
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MOPOR004 Recent Progress of 1-MW Beam Tuning in the J-PARC 3-GeV RCS resonance, injection, emittance, scattering 592
 
  • H. Hotchi, H. Harada, S. Kato, M. Kinsho, K. Okabe, P.K. Saha, Y. Shobuda, F. Tamura, N. Tani, Y. Watanabe, K. Yamamoto, M. Yoshimoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  
  The J-PARC 3-GeV RCS started 1 MW beam test from October 2014, and successfully achieved a 1 MW beam acceleration in January 2015. Since then, a large fraction of our effort has been focused on reducing and managing beam losses. This paper presents the recent progress of 1 MW beam tuning, especially focusing on our approaches to beam loss issues, such as space-charge induced beam loss and foil scattering beam loss during charge-exchange injection, etc.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR004  
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MOPOY052 200 MeV H− Linac Upgrades at Brookhaven linac, controls, ion, ion-source 968
 
  • D. Raparia, J.G. Alessi, G. Atoian, B. Briscoe, C. Cullen, D.M. Gassner, O. Gould, M. Harvey, T. Lehn, V. LoDestro, M. Mapes, I. Marneris, A. McNerney, J. Morris, W.E. Pekrul, J. Ritter, R.F. Schoenfeld, F. Severino, C. Theisen, A. Zaltsman, A. Zelenski
    BNL, Upton, Long Island, New York, USA
  
  The 200 MeV H− Linac has been operational for the last 45 years providing beam for the physics and isotope programs. Currently we are upgrading the Linac for improved reliability and integrated intensity. Recently we replaced the 7651 tubes with solid-state RF amplifiers. In addition, the low level RF system and Timing system were upgraded and new beam loss monitors were installed that is sensitive at low-energies and to neutrons. We have a plan for future upgrades to the vacuum, Controls, diagnostics and power supply systems. In order to achieve higher average current for the isotope program, it is plan to increase the beam pulse length from 450 us to 900 us. This will require modifications to the RF and all pulse power supply systems.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY052  
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TUPMR001 Preliminary Test of 1 Mv Electrostatic Accelerator at Komac ion, ion-source, high-voltage, extraction 1222
 
  • D.I. Kim
    KAERI, Daejon, Republic of Korea
  • Y.-S. Cho, H.-J. Kwon, S.H. Park
    Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
  
  Funding: This work was supported by the Ministry of Education, Science and Technology of the Korean Government.
1 MV electrostatic accelerator is being developed to satisfy the needs from the users, especially for the applications with a MeV range ion beam implantation at KOrea Multi-purpose Accelerator Complex (KOMAC). Typically, the accelerator consists of ion source, beam transport system and target chamber. For the accelerating voltage of a MeV range, ELV type high voltage power supply has been selected. And then, ion source has been selected as the newly developed RF ion source which can be installed inside the pressure vessel of high voltage power supply due to its limited space and electrical power. In this paper, preliminary test of 1 MV electrostatic accelerator including test results in test stand is presented. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR001  
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TUPMR005 First Results of a Turbo Generator Test for Powering the HV-Solenoids at a Relativistic Electron Cooler electron, solenoid, high-voltage, experiment 1233
 
  • A. Hofmann, K. Aulenbacher, M.W. Bruker, J. Dietrich, T. Weilbach
    HIM, Mainz, Germany
  • W. Klag
    IKP, Mainz, Germany
  • V.V. Parkhomchuk, V.B. Reva
    BINP SB RAS, Novosibirsk, Russia
  
  One of the challenges in a relativistic electron cooler is the generation of high voltage exceeding 2 MV and the powering of HV-solenoids, which need a floating power supply. As replacement of the well established, but limited, methods we propose streaming gas for the power transfer. The conversion of the energy by a turbo generator enables using scalable power supply / HV-generator combinations. BINP SB RAS has proposed two possibilities to build the power supply in a modular way. In the first proposal, two cascade transformers per module should be used; the first one powers 22 small HV-solenoids, the second one generates the voltage. In order to reach the final voltage, the modules are cascaded. The cascade transformers are fed by a turbo generator, which is driven by pressurised gas. The second possibility is to use two big HV-solenoids, which are powered directly by a turbo generator. The voltage could be generated for example with a Cockcroft Walton generator. A potential candidate is the Green Energy Turbine (GET) from the company DEPRAG, Germany. At the Helmholtz-Institut Mainz, two GET were tested. In this report, we present our experience and show first results.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR005  
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TUPMR039 The Development of a New High Field Injection Septum Magnet System for Main Ring of J-Parc injection, septum, operation, flattop 1337
 
  • T. Shibata, K. Ishii, H. Matsumoto, N. Matsumoto, T. Sugimoto
    KEK, Ibaraki, Japan
  • K. Fan
    HUST, Wuhan, People's Republic of China
  
  We are improving the Main Ring (MR) for beam power of 750 kw which is the first goal of J-PARC. The repetition period of the fast extraction must be short to 1.3 second from the current period of 2.48 second for the improvement of the beam power. It is necessary to exchange a high field injection septum magnet which will be installed at the injection line from RCS to MR and its power supply, because the current injection septum system can not be operated with 1.3 second repetition. Since confirmed the large leakage field around current circling beam line of the injection magnet, we must improve the shielding structure which make low leakage field. We started the development of the new injection septum magnet and its power supply in 2013. It can operate with 1 Hz repetition and the low leakage field which its order is 10-4 of the gap field. The new Injection septum magnet and the new power supply were constructed in Winter of 2014. We had many improvement of the magnet and power supply. We will install the new injection septum magnet system in this summer. In this presentation, we will report the detail of the results of its performance.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR039  
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TUPMR040 The Development of a New Low Field Septum Magnet System for Fast Extraction in Main Ring of J-PARC septum, operation, vacuum, extraction 1340
 
  • T. Shibata, K. Ishii, H. Matsumoto, N. Matsumoto, T. Sugimoto
    KEK, Ibaraki, Japan
  • K. Fan
    HUST, Wuhan, People's Republic of China
  
  The J-PARC Main Ring (MR) is being upgraded to improve its beam power to the design goal of 750 kW. One important way is to reduce the repetition period from 2.48 s to 1.3 s so that the beam power can be nearly doubled. We need to improve the septum magnets for fast extraction. We are improving the magnets and their power supplies. The present magnets which is conventional type have problem in durability of septum coil by its vibration, and large leakage field. The new magnets are eddy current type. The eddy current type does not have septum coil, but has a thin plate. We expect that there is no problem in durability, we can construct the thin septum plate, the leakage field can be reduced. The output of the present power supply are pattern current which of flat top is 10 ms width, the new one is short pulse which of one is 10 us. The short pulse consists of 1st and 3rd higher harmonic. We can expect that the flatness and reproducibility of flat top current can be improved. The calorific power can be also reduced. This paper will report the field measurement results with the eddy septum magnet systems.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR040  
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TUPMY036 Drive Generation and Propagation Studies for the Two Beam Acceleration Experiment at the Argonne Wakefield Accelerator kicker, laser, simulation, wakefield 1629
 
  • N.R. Neveu, M.E. Conde, D.S. Doran, W. Gai, G. Ha, C.-J. Jing, W. Liu, J.G. Power, D. Wang, C. Whiteford, E.E. Wisniewski
    ANL, Argonne, Illinois, USA
  • S.P. Antipov, C.-J. Jing
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • G. Ha
    POSTECH, Pohang, Kyungbuk, Republic of Korea
  • N.R. Neveu
    IIT, Chicago, Illinois, USA
  • D. Wang
    TUB, Beijing, People's Republic of China
  
  Funding: Work supported by by the U.S. Department of Energy under contract No. DE-AC02-06CH11357.
Simplified staging in a two beam accelerator (TBA) has been accomplished at the Argonne Wakefield Accelerator (AWA) facility. This layout consists of a drive beamline and witness beamline operating synchronously. The drive photoinjector linac produces a 70 MeV drive bunch train of eight electron bunches (charge per bunch between 5-40 nC) that pass through decelerating structures in each TBA stage. The witness linac produces an 8 MeV witness bunch that passes through the accelerating structures in each TBA stage. Recent effort has been focused on improving the uniformity of the UV laser pulses that generate the bunch trains. Current work at the AWA is focused on the transition from simplified staging to full staging. A kicker will be designed and installed to direct bunch trains to one TBA stage only. Preliminary calculations and simulation results are presented. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY036  
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WEPMY042 Effective Cycling and Ramping TANGO, synchrotron, device-server, synchrotron-radiation 2651
 
  • Ł. Żytniak, L.J. Dudek, P.P. Goryl, A. Kisiel, W.T. Kitka, A.I. Wawrzyniak
    Solaris, Kraków, Poland
  • P.J. Bell, V.H. Hardion, D.P. Spruce
    MAX IV Laboratory, Lund University, Lund, Sweden
  • G. Gaio
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  
  The National Synchrotron Radiation Centre Solaris, Kraków, Poland has been successfully built in collaboration with several institutes and organizations. The MAX IV Laboratory, Lund, Sweden and Elettra, Trieste, Italy, are the most important synchrotron partners. Solaris has built as an adaptation of MAX-IV 1.5 GeV ring and linear accelerator based on the same components as the ones of MAX-IV, therefore the device server for the magnet circuit has been developed by MAX-IV. Ramping was included in expert consultancy services contract won by Elettra. Solving problem with the power supplies stability and thanks to usage snapshots as steps for ramping it was possible to ramp the beam without losing current linearly.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY042  
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WEPOW040 Preliminary Beam Test for TPS Fast Orbit Feedback System feedback, interface, vacuum, electronics 2930
 
  • P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Huang, C.Y. Liao
    NSRRC, Hsinchu, Taiwan
  
  TPS (Taiwan Photon Source) is a 3 GeV synchrotron light source which had be successfully commissioning with SRF up to 500 Amp in 2015 and scheduled to open user operation in 2016. As most of the 3rd generation light source, the fast orbit feedback system would be adopted to eliminate various disturbances and improve orbit stability. Due to the vacuum chamber material made of aluminum with higher conductivity and lower bandwidth, extra fast correctors mounted on bellows will be used for FOFB correction loop and DC correction of fast correctors would be transferred to slow ones and avoid fast corrector saturation. This report summarizes the infrastructure of the FOFB and the preliminary beam test is also presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW040  
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WEPOY001 First Field Integral Measurement Campaign for Air Coil undulator, controls, operation, LabView 2991
 
  • Z. Zhao, B. Du, Q.K. Jia
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  • S. Karabekyan, J. Pflüger, M. Yakopov
    XFEL. EU, Hamburg, Germany
  
  For the operation of the air coils, which are needed for the undulator segments of the European x-ray free-electron laser (E-XFEL), precise conversion constants are needed to properly convert excitation current to steering strength. This paper describes the measurement of all 200 air coils, needed for this purpose using the short moving wire (MW) system. A LabView program was developed to measure the distribution of first field integral of both vertical (By) and horizontal (Bz) magnetic field components in the median plane of an air coil automatically. The program is an adaptation of the existing program, which was used to characterize magnetic properties of the phase shifters (PS). Before doing the measurements the new program automatically finds the centers of By and Bz components, which are found to match with the geometrical centers with sufficient accuracy. After the measuring procedure is complete, the results are presented as graphics output and final tables. It shows that the measurement results can fully meet the design requirements of E-XFEL. For all measurements the excitation current of the coils was set to 1 Ampere.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY001  
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THPMW001 SuperKEKB Main Ring Power Supply System wiggler, operation, quadrupole, controls 3531
 
  • S. Nakamura, T. Adachi, T. Oki, N. Tokuda
    KEK, Ibaraki, Japan
  
  The power supplies for magnets of KEKB main ring were recycled into SuperKEKB main ring. Several tests were performed for all of the power supplies to check the soundness. Some of the power supplies were improved to satisfy the requirements of optical design, and some of them were replaced by new power supplies. Most of the trim-coils were arranged with one of power supply per a coil in SuperKEKB. The total number of the power supplies is over 2000.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW001  
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THPMW002 Power Supplies for Main Magnet of J-PARC Main Ring controls, acceleration, experiment, extraction 3534
 
  • S. Nakamura, Y. Kurimoto, Y. Morita, T. Shimogawa
    KEK, Ibaraki, Japan
  
  A large magnetic field ripple of the order of 10-2 were observed at the first beam commissioning of J-PARC main ring in 2008, To eliminate the ripple, we had improved the magnet power supplies by reconstructing a trap-filter of 600 Hz and adopting an additional DCCT. We made differencial circuit and symmetrical wiring for all magnets. On the other hand, acceleration period was reduced from 2.5 s to 1.4 s for increasing the beam power with feedforward control. We summarize the improvements of the magnet power supplies in this paper.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW002  
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THPMW003 Prototype Power Supply for SuperKEKB Final Focus Superconducting Corrector Magnets superconducting-magnet, controls, luminosity, impedance 3537
 
  • T. Oki, T. Adachi, S. Nakamura, N. Ohuchi, N. Tokuda
    KEK, Ibaraki, Japan
  
  A prototype power supply for the SuperKEKB final focus superconducting corrector magnets was developed. The aiming specifications of the power supply are a DC rated output of ± 60 A ± 5 V bipolar, current setting resolution < 1 ppm, current stability < 5 ppm/8 h, temperature coefficient < 1 ppm/degree, and current ripple < 5 ppm, where the assumed magnet inductance and cable resistance are 0.2'8.7 mH and 75 mohms, respectively. High power tests were performed and expected results were obtained.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW003  
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THPMW004 Conceptual Design for the HEPS Power Supply System booster, controls, interface, storage-ring 3540
 
  • F. Long, Y.P. Liu, X. Qi, Z.H. ZhenHua
    IHEP, Beijing, People's Republic of China
  
  The High Energy Photon Source (HEPS) requires more than 1600 power supplies with various kinds of power rating. The power supply system includes power supplies for the Booster, Transport, and Storage Ring. The power supply for the Booster is based on 2Hz sinusoidal dynamic current output with 1000ppm current tracking requirement. And the power supply performance requirements of 10ppm long-term current stability are much more rigorous than commercial power supplies. The paper shows the conceptual design of the power supply system for the HEPS and possible solutions to critical technical challenges.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW004  
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THPMW006 The Realization of the System for Rapid Detection of Bepc Ii Magnet Power Supply database, controls, data-acquisition, real-time 3543
 
  • S.Y. Chen, M.C. Zhan, J.X. Zhang
    IHEP, Bejing, People's Republic of China
  
  To quickly find the causes of the accelerator unstable or lost beam caused by magnet power supply in the Beijing Electron Positron Collider running, this set of rapid detection system for magnet power supply is developed. The stability of the system in 8 hours is about 0.005%, it can acquire over nearly 500 sets of magnet power supply current value most quickly in the 0.33ms time. All data is written to the MySQL database in real time，So as to be able to quickly troubleshoot magnet power supply problem through historical data analysis of database comparison.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW006  
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THPMW007 The Design of a New State Space Digital Power Supply Prototype feedback, controls, FPGA, hardware 3546
 
  • K. Shu, J.X. Zhang
    IHEP, Beijing, People's Republic of China
  
  Based on system identification and DLQR methods, a self-adaptive power supply can be implemented by the new controller structure without any change in power main circuit. Now only some raw tests have been taken which show its stableness, but the State Space Digital Controlling may turned out to be with potential. It makes power supplies with different capability easy to interchange without any more effort on tuning their parameters according to their loads, and can be extended to accommodate MIMO systems.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW007  
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THPMW009 Data Mining Applied in Management of Heavy Ion Accelerator Power Supplies heavy-ion, ion, database, network 3552
 
  • H. Zhang, D.Q. Gao, Q.S. Qian, P. Sun
    IMP/CAS, Lanzhou, People's Republic of China
  
  Scientific and effective management of power supplies could reduce the failure rate and improve the efficiency of the heavy ion accelerator. This paper shows how to introduce data mining into the intelligent management of heavy ion accelerator power supplies. A web site platform was developed to collect raw data. The raw data includes many kinds of information about one power supply's life cycle form its development to operation. Among which the failure records are particularly important. According to the attribute that the records are mostly nominal data, R software and SQL Server 2008 Business Intelligence Development Studio were chose as mining tools. R soft-ware was used to carry on the statistical characteristic analysis and SQL Server 2008 Business Intelligence Development Studio was used to find out association rules. Useful conclusions have been drawn. This work has laid a solid foundation to further establish the intelligent management system of heavy ion accelerator power supplies.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW009  
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THPMW010 PAL-XFEL Dipole Magnet Power Supplies dipole, controls, quadrupole, operation 3555
 
  • S.-H. Jeong, Y.-G. Jung, H.-S. Kang, D.E. Kim, I.S. Ko, H.-G. Lee, S.B. Lee, D.H. Na, B.G. Oh, K.-H. Park, H.S. Suh
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  Total 632 magnet power supplies (MPSs) are under operating in PAL-XFEL. These magnet power supplies can be categorized as three types - corrector, quadrupole and dipole. The dipole MPSs are ranging from 110A/80V bipolar PS to 310A/200V unipolar PS. The long term stability of bipolar power supply is 10 ppm with 250 A 40V output for gun solenoid. The three types of dipole MPSs are developed for PAL-XFEL. Precise measurement results show that all power supplies meet the required specifications. The long term operation stability of the MPSs are appeared to be sufficient for a stable operation of the PAL-XFEL.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW010  
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THPMW011 Magnet Power Supplies Performance at the PLS-II Storage Ring sextupole, operation, quadrupole, storage-ring 3558
 
  • S.-C. Kim, A. Ahn, J.M. Kim, K.R. Kim, C.D. Park, J.C. Yoon
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  Funding: This work is supported by the Ministry of science, ICT and Future Planning, Korea.
Magnet power supplies(MPS) are operating unipolar(bending, main-quadrupole, sextupole and septum) and bipolar(slow corrector, fast corrector, aux-quadrupole and skew) at the PLS-II storage ring(SR). Unipolar MPSs maintain stability, and bipolar MPSs maintain stability, have best resolution performance total operation region including zero-crossing during beam operation. Slow and fast corrector MPSs for beam correction have good step response characteristics. In this paper, we present the improve activity and performance of the PLS-II SR MPS. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW011  
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THPMW013 Development of PAL-XFEL Magnet Power Supply interface, FPGA, operation, status 3564
 
  • K.-H. Park, S.-H. Jeong, Y.-G. Jung, D.E. Kim, I.S. Ko, H.-G. Lee, S.B. Lee, B.G. Oh, H.S. Suh
    PAL, Pohang, Kyungbuk, Republic of Korea
  • W.S. Choi
    POSTECH, Pohang, Kyungbuk, Republic of Korea
  
  All magnets and magnet power supplies (MPS) for PAL-XFEL had been installed at the site. The all MPSs had been tested with the magnets at the field. The total number of assembled MPSs was amounted to 688, which were grouped into nine categories by their power capacities in order to reduce the manufacturing cost and make maintenance easy. The general specifications for the MPS for the PAL- XFEL were summarized. The design configurations of the MPS were also explained to satisfy the given requirements such as the output current stability. The test results of performances of the MPSs for corrector magnets were described here.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW013  
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THPMW014 High Voltage Supply for Particle Accelerators Based on Modular Multilevel Converters high-voltage, operation, flattop, controls 3567
 
  • P. Asimakopoulos, K.D. Papastergiou
    CERN, Geneva, Switzerland
  
  Modular Multilevel Converters brought a paradigm shift in very high voltage and high power applications with the replacement of high voltage valves by multiple series-connected, low-voltage modules that can be by-passed in case of fault. The reliability and precision in output waveform generation make it a potential candidate in accelerator power conversion. This work demonstrates operation of MMC-based high voltage magnet supply for a transfer line application. The output current regulation precision and the total power losses are examined. Finally, the challenge of the control optimization combined with the passive components dimensioning is highlighted.
* R. Marquardt and A. Lesnicar, "An innovative modular multilevel converter topology suitable for a wide power range", in Proc. IEEE Bologna Power Technol. Conf., Jun. 2003, pp. 1-6.
 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW014  
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THPMW015 A Digtal Regulation Controller Prototype for the TPS Booster Power Supplies controls, booster, dipole, feedback 3570
 
  • B.S. Wang, Y.-C. Chien, Y.T. Li, C.Y. Liu, K.-B. Liu, Y.S. Wong
    NSRRC, Hsinchu, Taiwan
  
  In the newly built TPS (Taiwan Photon Source), the AC power supplies of the Booster ring are required to operate in DC and AC mode with accuracy. Especially in AC mode, during the booster ramping process, the current ramping profiles of the Quadruple Magnets have to track that of the Dipole AC power supply with precise phase and amplitude to maximize the beam energy boost efficiency. At present, analog current commands for all the booster power supplies with relative phase and amplitude information are generated externally. The current ramping profiles are pre-calculated and calibrated in a centralized manner. In this paper, an auto-calibration process using Curve-Fitting algorithm is proposed. In the new process, the current ramping profile data is first stored digitally in each power supply and then outputted to each power supply with a synchronous trigger signal in hope to eliminate the signal integrality problem inherent in analog signals , so that the beam energy boost up could be more reliable and efficient. The new proposed method has been implemented and tested successfully and will be applied to the booster power supplies to test its performance in the future.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW015  
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THPMW016 Dipole Power Supply for the Storage Ring of Taiwan Photon Source dipole, storage-ring, booster, controls 3573
 
  • C.Y. Liu, Y.-C. Chien, K.-B. Liu, B.S. Wang, Y.S. Wong
    NSRRC, Hsinchu, Taiwan
  
  The performance of the TPS dipole power supply for the dipole magnets in the TPS storage ring is important. As the output current of the power supply follows the beam current for operation at 3 GeV, the power supply must deliver enormous energy to the dipole magnets. The target energy corresponds to 700 A at 800 V. The dipole supply for the TPS storage ring is a unipolar switching power supply, also called a bulk power supply. The TPS dipole power supply modulates the output current regulated by the PWM signal. The switching device is an IGBT module working at frequency 2 kHz. A PID controller and a DCCT are used for feedback control of the output current. We obtained an optimal control gain with long-term stability of the output current under 10 ppm. The performance of the TPS storage ring dipole supply can thus satisfy the TPS requirement. The beam current generates 3 GeV in the TPS ring. This paper reports the excellent results.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW016  
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THPMW017 Phase Shifter Power Supply Design controls, simulation, electron, photon 3576
 
  • Y.T. Li, K.-B. Liu, B.S. Wang, Y.S. Wong
    NSRRC, Hsinchu, Taiwan
  
  Taiwan Photon Source is an interdisciplinary project. The phase-shift magnet is used to connect the radiation phase between two EPU48s. The power supply for this phase-shift magnet is a key element to determine the phase shift quality. In this report, the theory of the designed circuit is firstly introduced, and then a comparison simulation result and actual measurement is summarized to prove the correctness of theoretical analysis and circuit design.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW017  
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THPMW018 Simulation a High Step-up DC-DC Converter for Accelerator simulation, operation, sextupole, quadrupole 3579
 
  • Y.S. Wong, Y.-C. Chien, C.Y. Liu, K.-B. Liu, B.S. Wang
    NSRRC, Hsinchu, Taiwan
  
  This paper simulation a novel high step-up DC-DC high circuit architecture for storage ring quadrupole and sextupole power supply DC bus voltage. The input source is a low voltage photovoltaic energy through proposed circuit to increase high output voltage system. This volt-age can be as DC bus of quadrupole and sextupole power supply. The part of the circuit has a power switch, isolated transformer inductors, switched capacitors and diodes. This proposed circuit has the advantages of galvanic isolation function, small transformer and high step-up gain and efficiency. Continuous conduction mode (CCM) operation principles are discussed in this paper. Finally, Simplis software has been used for simulation a 24 Vdc step-up to 200 Vdc and 100 w DC-DC converters.
high step-up, switched capacitor, photovoltaic 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW018  
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THPMW023 Simulation of an Accelerator Pulse Power Supply with an Active Rectifier Using SIMPLORER simulation, controls, heavy-ion, ion 3594
 
  • F.J. Wu, D.Q. Gao, M. Li
    IMP/CAS, Lanzhou, People's Republic of China
  
  In this paper, a simulation model of an accelerator pulse power supply with an active rectifier (voltage-type SVPWM rectifier) was set up based on the C-Model function in SIMPLORER 8.1, which is a simulation software belonging to the ANSOFT corporation. We introduce a SVPWM rectifier into an accelerator pulse power supply to solve its problems such as low input power factor, a large number of AC current harmonics and instable DC bus voltage due to the diode or thyristor rectifier used in it now. Components of control strategies developed in C language were built up and inserted into the simulation project. The simulation results indicate that an accelerator pulse power supply with a SVPWM rectifier can solve the problems above well. For all the control strategies were developed in C language, they can be transplanted into the digital signal processor (DSP) nearly without change for the prototype controlling. So it provides a basis for development of the experimental prototype.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW023  
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THPMY024 Upgrade of a UHV Furnace for 1700 C Heat Treatment and Processing of Niobium Samples vacuum, niobium, radiation, radio-frequency 3709
 
  • J. Conrad, L. Alff, R. Grewe, T. Kürzeder, M. Major, N. Pietralla
    TU Darmstadt, Darmstadt, Germany
  • F. Hug
    IKP, Mainz, Germany
  • S.T. Sievers
    MIT, Marburg, Germany
  
  Funding: Supported by the German Federal Ministry for Education and Research (BMBF) under Grant No. 05H15RDRBA
In 2005 a high temperature vacuum furnace was put into operation at the Institute for Nuclear Physics at the Technische Universität Darmstadt. It has been designed for firing pure Niobium at temperatures of up to 1870 C. Until now several Nb cavities have been heat treated at 850 C with a proven record of success. The current focus of research in improving the superconductive characteristics of accelerator cavities is on new materials such as Nb3Sn or NbN or on the doping of Nb surfaces with nitrogen, so called N2-Doping. The surface preparations generally take place at temperatures of not more than 1000 C. To study phenomena that occur at higher temperatures, like the formation of delta-phase NbN at 1300 to 1700 C, it is planned to refurbish the UHV furnace and use it for corresponding studies. We will report on the design of a new annealing pot and a sample holder and give a review on our first experiences with the upgraded furnace. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY024  
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THPOW013 ARM-Based Controller of Power Supply for Focus Solenoid of Klystron klystron, controls, solenoid, linac 3957
 
  • Z.R. Zhou, F.L. Shang, L. Shang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Funding: Supported by the National Science Foundation of China 11175181 By the Fundamental Research Funds for the Central Universities WK2310000056
Klystrons are widely used in accelerators to provide powerful microwave power to the accelerating structure of linac to accelerate particles. The stability of a klystron is affected by the beam quality of high voltage gun of the klystron. The focus solenoid is needed to provide focus magnetic field around the klystron. ARM-based high performance of current stability power supply is designed to improve the quality of focus magnetic field of klystron, with a two-loop-hybrid design, which could achieve fast dynamic response and high static stability performance, instead of analogue power supply design. The bench test of the ARM-based controlled is done and the commissioning of the controller needs be done in future study. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW013  
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THPOW050 Upgrade of Septum Magnets of the Transfer Line in TPS septum, injection, simulation, booster 4057
 
  • C.S. Yang, C.-H. Chang, Y.L. Chu, J.C. Huang, C.-S. Hwang, J.C. Jan, F.-Y. Lin
    NSRRC, Hsinchu, Taiwan
  
  Taiwan Photon Source (TPS) is a 3-GeV light source. The full current of the storage beam and commissioning of insertion devices are still in progress. An improved injection between the booster ring (BR) and the storage ring (SR) was implemented to increase the efficiency of injection and the reliability of the electrical parts. A DC septum (length 0.8 m) was replaced with an AC septum (length 1 m, type C) to decrease the leakage field and to relax the loading of the power supply. Mapping the field with mu-metal shielding was also implemented to diminish the leakage field from the AC septum. The lattice of the transfer line between the booster ring and the storage ring, BTS, was also rearranged to meet the new injection requirements. The performance of the AC septum with mu-metal shielding and the upgrade of the BTS lattice are discussed in this paper.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW050  
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THPOY001 Implementation of a New Ramp Computation Scheme for the Magnet Power Supplies at ELSA controls, electron, extraction, injection 4085
 
  • D. Proft, W. Hillert
    ELSA, Bonn, Germany
  
  At the ELSA electron stretcher facility new power supply control units have been commissioned. These require a new software interface for set-point calculation based on the accelerator and timing model. Goal of the new scheme is a strict separation of the bidirectional ramp computation into an accelerator model dependent, a magnet dependent and a power supply dependent part. This introduces possible calibration/correction factors on each layer, thus allowing easy component replacement of the power supplies, the control units or even the magnets without the need for recalibration of the whole chain. In this contribution we will provide insights into the implementation of the new modeling scheme.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY001  
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THPOY007 Application of Embedded Linux Boards in SSRF and SXFEL Control System controls, embedded, Linux, EPICS 4098
 
  • Y.B. Yan, G.H. Chen, L.W. Lai, Y.B. Leng, L.Y. Yu, W.M. Zhou
    SINAP, Shanghai, People's Republic of China
  
  Funding: CAS Key Technology Talent Program and Youth Innovation Promotion Association
The embedded Linux boards, such as Raspberry Pi B+ and Beaglebone Black, are credit-card-sized single-board computer. They are low-cost and equipped with a huge array of GPIO (general purpose input output), which can be used to take readings from sensors and control external devices. The active development community and open-source nature also make them ideal choices for many applications. They can be integrated with the accelerator control system and make more devices 'intelligent' via an economical way. It will be helpful to improve the efficiency of the accelerator. The details of the applications in SSRF and SXFEL control system will be reported in this paper. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY007  
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THPOY016 Fast Machine Interlock Platform for Reliable Machine Protection Systems hardware, EPICS, controls, timing 4119
 
  • R. Tavčar, J. Dedič, E. Erjavec, R. Modic
    Cosylab, Ljubljana, Slovenia
  • M. Liu, C.X. Yin
    SINAP, Shanghai, People's Republic of China
  
  This article presents a machine interlock system (MIS), designed and developed in collaboration between SINAP and Cosylab. The design is based on the experience and requirements of different accelerator facilities around the world, with the goal of providing, out of the box, the flexibility, reliability, availability, determinism, response speed, etc., which facilities need for a Machine Protection System (MPS). The goal of the MIS platform is to provide a reliable tool, which covers all the common MIS behaviour, required by an MPS designer. The system is based on a proven hardware platform, uses radiation-tolerant FPGAs, has built-in redundancies for power supply, hardware components and logic and is configurable from EPICS. We present several design principles that were used and explain the features and principles of application. Furthermore, we present the system architecture, from hardware and firmware to software. The MIS system is currently being installed at the BNCT facility at the Ibaraki Neutron Medical Research Center in Japan and is planned in the treatment interlock system of APTRON, the Advanced Proton Therapy Facility in Shanghai, China.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY016  
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THPOY018 Main Operation Improvements on Taiwan Light Source operation, feedback, controls, FPGA 4125
 
  • C.H. Kuo, H.H. Chen, H.C. Chen, K.T. Hsu, S.J. Huang, J.A. Li, C.Y. Liao, M.-C. Lin, Y.K. Lin, Y.-C. Liu
    NSRRC, Hsinchu, Taiwan
  
  With the beam energy of 1.5 GeV, the storage ring of Taiwan Light Source (TLS) in National Synchrotron Radiation Research Center (NSRRC) has provided research service to users for more than twenty years. It takes a lot of efforts to keep this accelerator reliable and to improve its stability. NSRRC has finished the construction and commissioning of the new 3-GeV accelerator Taiwan Photon Source (TPS) which will be opened to users with limited beam lines in 2016. On the other hand, TLS has 25 beamlines and still serves users very well as being benefited by its mature operation skills and continuous efforts on maintenance and system improvement. Main challenges and corresponding solutions on TLS operation in these recent years t are presented herein, together with the statistics on operation performance.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY018  
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THPOY024 Demagnetization of an Entire Accelerator Vault cyclotron, electron, TRIUMF, linac 4143
 
  • T. Planche, R.A. Baartman, S.R. Koscielniak
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  • G. Arias, T.C. LeRoss, K.K.S. Multani
    UBC, Vancouver, B.C., Canada
  • D.A. Bissky Dziadyk
    McGill University, Montréal,, Canada
  • T. Zuiderveen
    University of Ottawa, Ottawa, Ontario, Canada
  
  The ARIEL electron linac produced its first high-energy beam on 31 September 2014. Despite over 40 years of experience with ion beams, transporting electrons constituted a new challenge for TRIUMF. With good reason: the difference in rest mass makes electrons orders of magnitude more sensitive than ions to magnetic fields (for the same kinetic energy). In this paper we show how beam steering could have been seriously compromised by the remament field from the structural steel of the building, and how this issue was addressed using a technique developed to demagnetize steel-hull ships: we degaussed the entire accelerator vault.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY024  
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