IPAC2019 - Classification: MC7: Accelerator Technology / T11 Power Supplies

Paper	Title	Page
TUPMP001	Design and Experimental Results of a 1.1kA/800V AC Power Supply for Sirius Booster Dipoles	1227
	C. Rodrigues, G.O. Brunheira, B.E. Limeira, G.M. Rogatto LNLS, Campinas, Brazil
	Sirius is a 4th generation synchrotron light source de-signed and being built by Brazilian Synchrotron Light Laboratory (LNLS), with first beam scheduled for 2019. Approximately thousand power supplies (PS) will be needed to feed all the magnets, being 57 to operate the booster injector. The two booster dipole PS are the most complex, not only due to their higher current (1.1 kA), voltage (800 V) and power (333 kW) output, but also because the current must follow a quasi-triangular waveform, from a value close to zero to almost the maximum in 320 ms and at a repetition rate of 2 Hz. Due to the high output values, each PS is formed by two sets in parallel of 4 modules in series, what means 8 modules with 550 A / 200 V output. In order to reduce the 2-Hz effect in the grid, each module has two main stages. The input stage has the function to regulate the average voltage in a capacitor bank consuming a constant RMS current from the grid, which value depends on of the PS average output power. The output stage has the function to transfer the energy from the capacitor bank to the load, with the output cur-rent following the reference waveform. This work describes this PS, showing its topology, some aspects of its design and obtained results.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP001
About •	paper received ※ 13 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP002	Overview of Sirius Power Supply System	1230
	C. Rodrigues, G.O. Brunheira, B.E. Limeira, R.J. Marcondeli, M.G. Martins, G.R. Oliveira, A.R.D. Rodrigues, G.M. Rogatto, A.P.A. Silva, A.R. Silva, H. Sousa LNLS, Campinas, Brazil
	Sirius is a 4th generation synchrotron light source designed and under construction by Brazilian Syn-chrotron Light Laboratory (LNLS), which first beam is scheduled to operate in 2019. Almost a thousand Pow-er supplies (PS) will be needed to feed all magnets of the magnetic lattice, with outputs ranging from 10A to 1.1kA and 50W to 333kW. Almost all power supplies were designed at LNLS. Only three families of power modules were de-signed: low power (FBP), high power (FAP) and AC (FAC). Each PS can have up to 8 modules in a parallel or/and series association, in order to reach the rated output values. All PS are digitally controlled by the same hardware and firmware, also developed by LNLS, called Digital Regulation System (DRS), but with different parameter settings. The DRS is also responsible by the communi-cation with other systems, PS monitoring, data man-agement, etc. This work presents an overview of this system, showing the PS specifications, family topologies and results of tests.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP002
About •	paper received ※ 13 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP011	Storageless Resonant Converter for Accelerator Magnets	1248
	M. Cautero, T.N. Gucin Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	Elettra Sincrotrone Trieste, a specialized research centre generating high quality synchrotron radiation, has been in operation since 1993 and was revised in 2009. Recently, Elettra has been funded for a complete renewal of the storage ring. For the new machine, it is planned to employ state of the art converters, mostly of which will be designed in-house. For this purpose, it has been decided to evaluate the performance of a storage-less resonant converter, pro-posed by Dr. Slobodan Ćuk, which is a step down DC/DC converter consisting of four switches, one resonant capac-itor and two resonant inductors. For this purpose, the voltage conversion ratio of the converter has been de-rived. The topology was confirmed with simulation and a PCB layout has been designed, which is still to be tested.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP011
About •	paper received ※ 08 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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TUPMP012	Power Converters for the ESS Warm Magnets: Procurement Status	1251
	R. Visintini, M. Cautero, T.N. Gucin Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy C.A. Martins ESS, Lund, Sweden
	In the frame of the Italian In-Kind collaboration for the construction of the European Spallation Source (ESS), Elettra Sincrotrone Trieste research center is in charge, among all, of the provision of the power converters for the warm magnets of the superconducting part of the linear accelerator and of the proton beam transport line. The procurement process is running for all types of power converters. The first components have been delivered to ESS already in March 2018, while the Dipole and Quadrupole power converters are under construction. The first batches have been factory tested and shipped to Lund. The corrector power converters have been manufactured and are currently tested and calibrated at Elettra before their delivery to ESS.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP012
About •	paper received ※ 09 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP014	Digital Control System of High Precision Magnet Power Supply for SPring-8-II	1259
	C. Kondo, K. Fukami, S. Takano, T. Watanabe Japan Synchrotron Radiation Research Institute (JASRI), RIKEN SPring-8 Center, Hyogo, Japan T. Fukui, H. Tanaka RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan S. Nakazawa SES, Hyogo-pref., Japan N. Nishimori QST, Tokai, Japan C. Saji JASRI/SPring-8, Hyogo-ken, Japan
	For the SPring-8 upgrade plan, SPring-8-II, a variety of magnet power supplies (PS) from 10 W to larger than 100 kW with a high current stability of about 10 ppm (pk-pk, typ.) are required. In order to develop the PSs within a given time and budget, we plan to use a common control system based on a digital control technology that can be adopted for the variety and the high precision PSs. The system consists of a high-precision analog-digital converter (ADC) circuit and a field programmable gate array (FPGA). Since the precision of the ADC circuit determines the current stability of the PS, we first developed the ADC circuit of high accuracy of less than 10 ppm (pk-pk). A proportional-integral (PI) control logic and a digital pulse width modulation (PWM) function was implemented in the FPGA firmware. These functions can be easily modified for each power supply by a desktop computer. We prototyped a DC power supply equipped with the newly developed digital feedback control system and confirmed that the current fluctuation was suppressed to less than 10 ppm (pk-pk). In the presentation, we will report the current status and future perspective of our power supply development including the evaluation results of the new circuits and the power supply we have developed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP014
About •	paper received ※ 16 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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TUPMP015	Magnet Power Supply Calibration with a Portable Current Measuring Unit at the J-PARC Main Ring	1263
	K. Miura, Y. Kurimoto, Y. Morita, D. Naito, T. Oogoe, T. Shimogawa KEK, Ibaraki, Japan Y. Kuniyasu Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan K. Ooya SANKYU PLANT TECHNO CO., LTD., 6-5-3, Kachidoki, Japan R. Sagawa Universal Engineering, Ibaraki-ken, Japan
	In the J-PARC MR, 96 bending magnets (BMs) are used in total. They are divided into 6 groups of 16 BMs. The 16 BMs in each group are connected in series and driven by a single power supply. Since all 96 BMs are symmetrically located in the ring, the magnet currents regulated by the 6 power supplies need to be same. Each power supply performs output current feedback control using electronic circuits including analog amplifications and AD / DA conversions. Due to individual differences of the electronic circuits, output current is generally expected to be different for each power supply. Therefore, we developed a current measurement unit with the portable DCCT as an independent reference. Further, we measured the magnet currents regulated by the 6 BM power supplies using the unit. We report the details of the unit as well as the results of the current measurements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP015
About •	paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP016	New Power Supply of Main Magnets for J-Parc Main Ring Upgrade	1266
	T. Shimogawa, Y. Kurimoto, K. Miura, Y. Morita, D. Naito KEK, Ibaraki, Japan R. Sagawa Universal Engineering, Ibaraki-ken, Japan
	It is plans that the proton beam power provided to experimental facilities increase with shortening repetition period in J-PARC Main Ring (MR). As the shorten repetition period, the replacement of the power converters for main magnets in J-PARC MR is necessary to cope with issues such as power fluctuation of the main grid and increase of the output voltage. We have considered and developed the power converters with a 10 MW class which have the capacitor banks with the large capacitance. In the end of 2017, the first new power converter for a bending magnets family, which is the largest power converter in this upgrade plan, was installed in J-PARC site and the power test is ongoing using a dummy and a real load. In this report, the first new power converter for a bending magnets family in J-PARC MR is reported including the test results.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP016
About •	paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP017	Design of Scanning Magnet Power Supply for HUST-PTF	1269
	X.Y. Li, Y.Y. Hu, Y.J. Lin, P. Tan, X.D. Tu, Y.C. Yu, L.G. Zhang, Z.Q. Zhang HUST, Wuhan, People’s Republic of China
	An active scanning proton therapy facility is being de-veloped at Huazhong University of Science and Technol-ogy（HUST）. By controlling the deflection position of the beam with scanning magnets at different times, the superposition of discrete spot beams will form a specified shape and dose distribution conformal to the target tu-mour. A high precision and fast response power supply is required to deflect the beam quickly and accurately. In this paper, the TOSCA module in Opera3D is used to model and simulate the scanning magnets and to obtain the equivalent inductance of the magnet. Then the calcu-lated equivalent resistance inductance instead of the magnet is used to design the scanning magnet power supply. A high-voltage bridge is utilized to achieve fast response speed, and a low voltage bridge and PI control algorithm is adopted to ensure power supply accuracy. The Simulation result shows that the designed power supply meets the requirements of response speed and accuracy.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP017
About •	paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP020	The Research on the Calibration of Direct-Current Current Transformers	1280
	C. Han, Y. Gao, X.L. Guo, P. Liu IHEP, Beijing, People’s Republic of China
	The measurement accuracy of direct current-current transformer (DCCT) is one of the key factors influencing the output of high-precision direct current power supply. In this paper, a calibration system designed by measuring resistance principle with a high accuracy direct current comparator (DCC) was presented for DCCT whose measurement accuracy is better than 10^-5. The system can achieve high-precision calibration of DCCT within the measurement range of 0-400 A, and the uncertainty of the system calibration is better than 1.1×10-6 in the whole range. The accuracy and linearity of DCCT are tested to verify the accuracy of the whole calibration system, thereby the current accuracy of the magnet power supply can be further improved.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP020
About •	paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP022	Research on Digital Scanning Power Supply Technology for Proton Therapy System	1286
	J. Huang, M. Fan, J. Yang, L.G. Zhang HUST, Wuhan, People’s Republic of China T. Yu, C. Zuo Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People’s Republic of China
	Funding: Work supported by The National Key Research and Development Program of China, with grant No. 11505068 Proton has great advantages in the field of cancer radiotherapy because of its good characteristic of Bragg peak. HUST-PTF is a proton therapy facility under development in Huazhong University of science and technology. It delivers the beam to the patients with a pencil beam scanning nozzle. Scanning power supplies are placed in the nozzle of the proton therapy device and they are required high accuracy, high speed and high stability. In this paper，the structure diagram of HUST-PTF is shown. The parameters of scanning magnets and its power supply are introduced. Finally, some test results of power supply are shown. The next work will debug the control system of the scanning power supply and adjust it with the scanning magnet to see if it meets the design requirements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP022
About •	paper received ※ 19 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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TUPMP023	Design of Digital Controller for Multi Module Series-parallel Accelerator Power Supply	1288
	J. Li, Y. Liu, X. Qi, W.Q. Zhang IHEP, Beijing, People’s Republic of China
	Funding: Supported by funds, Key laboratory of particle Acceleration Physics & Technology, Institute of High Energy Physics, Chinese Academy of Sciences，Project number：Y5294107TD With the development of accelerators, Accelerator physics require power supply output high voltage and current (Peak power reached MWs). And the current stability requirements better than 10ppm. Therefore, the power supply is mostly used in the mode of module series-parallel. However, during actual commissioning, the power supply often does not run at rated current. If the power supply is running at less than 30% of the rated current, the power output current stability will drop sharply. This topic designed a set of digital controller for multi-module serial-parallel control. The digital controller can automatically adjust the number of input modules according to the current setting, and can automatically allocate the required PWM number of the module. While taking into account the synchronization between the various modules, Ensure the power supply is always running at an optimal working condition. Through a special AD conversion hardware design and advanced closed-loop controller algorithm, the digital controller can provide up to 20 high-resolution PWM signals to drive power conversion devices.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP023
About •	paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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TUPMP024	Research on Module Design and Network Management of Accelerator Power Supply System	1291
	Y. Li, S.Y. Chen, C. Han, P. Liu IHEP, Beijing, People’s Republic of China
	Accelerator power supply system is a very special system. Many factors such as high number of power supplies, uninterrupted operation and unreasonable design lead to high failure rate, long maintenance time and the discovery of the fault is not timely, which bring a lot of unnecessary troubles to the operator. In this paper, a networked control method for accelerator power supply is studied, and the power supply parallel connection technology is used to maximize the trouble-free time of the power supply and increase the redundancy performance of the power supply. With independent networked control, the accelerator power supply system becomes a whole, no longer relying solely on the control of the accelerator control system, but in a network system with self-diagnosis and self-healing. Through the monitoring and management of the upper computer, the power supply system will be work stable, and the function of remote operation and remote repair of the power supply is realized finally. This is a research direction for the operation of large accelerator power supply systems in the future.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP024
About •	paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP025	Design of Fast Corrector Magnet Power Supply for HEPS	1294
SUSPFO065	use link to see paper's listing under its alternate paper code
	P. Liu, C. Han, F. Long IHEP, Beijing, People’s Republic of China
	High energy photon source is a fourth-generation synchrotron radiation light source with energy of 6Gev and ultra-low emittance (<0.1nm’rad). The ultra-low beam emittance requires high beam stability. Therefore, we develop a fast correction power supply with high bandwidth and low current ripple to improve the performance of the fast close orbit correction sys-tem to prove the high beam stability. The power supply adopts FPGA for full-digital control and use high speed ADC with temperature control. The power sup-ply has a small signal-bandwidth of 10 kHz and output current ripple lower than 20ppm. In this paper, we will describe the hardware design and software control methods and the test results will be demonstrated
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP025
About •	paper received ※ 13 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP027	Research and Design of Digital Magnet Power Supply Controller	1297
	Z.X. Shao, H. Gao, G. Liu, P. Liu, X.K. Sun, H.Y. Zhang USTC/NSRL, Hefei, Anhui, People’s Republic of China
	Funding: Supported by’the Fundamental Research Funds for the Central Universities’（WK2310000064） Hefei Advanced Light Source (HALS) is the fourth-generation radiation light source in China which is under design. Ultra-low beam emittance requires higher performance of power supply system. The power supply controller is a key part of the power system. This article describes the design and testing of high-stability power controllers and fast corrector power supply controllers. A new controller architecture is proposed for the problems of the two controllers.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP027
About •	paper received ※ 29 April 2019 paper accepted ※ 18 May 2019 issue date ※ 21 June 2019
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TUPMP028	Research Progress of Power Supply System in HALS	1300
SUSPFO068	use link to see paper's listing under its alternate paper code
	Z.X. Shao, H. Gao, G. Liu, P. Liu, L. Wang, H.Y. Zhang USTC/NSRL, Hefei, Anhui, People’s Republic of China
	Funding: Supported by ’the Fundamental Research Funds for the Central Universities’（WK2310000064） Supported by the Hefei Advanced Light Source Pre-research Project. Hefei Advanced Light Source (HALS) is the fourth generation light source in China’s planning and construction. In order to achieve the diffraction limit of the emission and improve the beam quality, the research on magnet power supply (MPS) technology is essential. We have designed a variety of solutions for different power supplies. We designed the first version of the high stability power supply control card. The first version of the high-stability power supply control card was designed and tested with a small power module. Our pre-research system has developed a corrector magnet power supply with a small signal response bandwidth higher than 10 kHz. The developed power prototypes all use self-developed controllers, and most of the test results can meet the requirements. This article describes the progress of the HALS power supply system.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP028
About •	paper received ※ 08 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP032	Design of Analog to Digital Converter Scheme for High - Precision Electromagnet Power supply	1309
	M.J. Kim, Choi. Choi POSTECH, Pohang, Kyungbuk, Republic of Korea J.H. Han, S.-H. Jeong, Y.G. Jung, H.-S. Kang, D.E. Kim, H.-G. Lee, S.B. Lee, S.J. Lee, B.G. Oh, K.-H. Park, H.S. Suh PAL, Pohang, Kyungbuk, Republic of Korea M.S. Kim Dongguk University, Seoul, Republic of Korea
	This paper deals with the design of an analogue-to-digital converter (ADC) scheme for a highly precise magnet current supply (MPS). The MPSs are requires with stable and precise current specification in range of the ppm. To meet the requirements, the AD circuit is composed of parallel ADCs of low-medium resolution. Digitally, the oversampling and averaging are performed to increase both the effective resolution and the signal to noise ratio (SNR). The implemented AD circuit was improved about 18 dB (32 times oversampling). The MPS applied by the proposed ADC scheme provides more precise control and the stable current within 10 ppm at 200 A. The experiment used a dipole magnet of the PAL-XFEL and its results proved feasibility through precisely measurable DVM3458A (Keysight Co.).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP032
About •	paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP034	A Modular Optical Firing Interface for CERN’s Generic Power Converter Control Platform	1315
	M. Di Cosmo, T.G. Gaime, B. Todd CERN, Geneva, Switzerland
	The power converters group at CERN has developed a third generic converter controller (FGC3) and regulation platform (RegFGC3), capable of controlling any of CERN’s power converters. This platform provides electrical connections to the low-level control elements of power converters, and in some cases a galvanic isolation is required between the converter controller output, and the power converter under control. To meet these requirements, a generic modular optical firing platform has been developed, which converts the electrical firing pulses from the RegFGC3 and FGC3 platforms into optical drive signals. Designed to be fully scalable, this platform provides various protection mechanisms to verify the integrity of the firing information. For example, checking for illegal firing states, dead-time, and drive errors. This paper describes the modular optical firing interface, the basic principles, and the configurations which are in use, or are planned to be used at CERN.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP034
About •	paper received ※ 15 May 2019 paper accepted ※ 17 May 2019 issue date ※ 21 June 2019
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TUPMP039	Data-driven Controller Design Using the CERN Power Converter Control Libraries (CCLIBS)	1335
	A. Nicoletti, M. Martino CERN, Geneva, Switzerland
	The data-driven control approach is a control methodology in which a controller is designed without the need of a model. Parametric uncertainties and the associated unmodeled dynamics are therefore irrelevant; the only source of uncertainty comes from the measurement process. The CERN Power Converter Control Libraries (CCLIBS) have been updated to include data-driven H-infinity control methods recently proposed in literature. In particular, a two-step convex optimization algorithm is performed for obtaining the 2-degree-of-freedom controller parameters. The newly implemented tools in CCLIBS can be used both for frequency response measurement of the load and for controller synthesis. A case study is presented where these tools are used for an application in the CERN East Area Renovation Project for which a high-precision 900 A trapezoidal current pulse is required with 450 ms flat-top and 350 ms ramp-up and ramp-down times. The tracking error must remain within ± 100 parts-per-million (ppm) during the flat-top (before the ramp-down phase starts). The magnet considered in the case study is of non-laminated iron type, hence the necessity of data-driven techniques since the dynamics of such a magnet is difficult to be modeled accurately (due to eddy currents losses). The Power Converter used is a SIRIUS 2P (with a current and voltage rating of 400 Arms and 450 V, respectively) whose digital control loop is regulated at a sampling rate of 5 kS/s.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP039
About •	paper received ※ 08 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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TUPMP040	Impact of Flux Jumps on High-Precision Powering of Nb₃Sn Superconducting Magnets	1338
	M. Martino, P. Arpaia, S. Ierardi CERN, Geneva, Switzerland
	Nb₃Sn superconducting magnets represent a technology enabler for future high-energy particle accelerators. A possible impediment, though, comes from flux jumps that, so far, could not be avoided by design unlike for NbTi technology. However, the impact of flux jumps on the powering has not been properly investigated to date. Flux jumps appear during current ramps at relatively low value of current and tend to disappear towards nominal current. They are usually detected as voltage jumps between different magnet coils but they might also produce overall voltage jumps across the magnet electrical terminals. Such jumps might perturb the power converter feedback control loop and therefore potentially jeopardize its precision performance during energy ramps. This work aims at : (i) presenting preliminary experimental test results on some HL-LHC Nb₃Sn model and prototype magnets, and (ii) attempting to build a simplified electrical model of the flux jumps (with focus only at its interaction with the power converter feedback control loop). Such work is a starting point for outlining possible power converters control strategies able to minimize flux jumps impact on high-precision powering of Nb₃Sn superconducting magnets.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP040
About •	paper received ※ 23 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP046	Improvement the Bending Magnet Power Supply Performance for TPS Storage Ring	1353
	B.S. Wang, C.H. Huang, J.C. Huang, C.Y. Liu, K.-B. Liu, Y.S. Wong NSRRC, Hsinchu, Taiwan
	In the TPS (Taiwan Photon Source) facility, current stability of the electron beam depends on the bending magnet power supply and an orbit FOFB system to compensate the magnetic field. Due to the output current stability of the bending magnet power supply drifts with temperature so the orbit FOFB system should be applied to fine tune magnetic field and the photon beam should circulate in storage ring. In this paper, to stabilize the temperature of regulation circuit’s temperature box of the bending magnet power supply, the long-term output current stability is improve from ± 50ppm to ± 10ppm, and orbit FOFB system substantially reduce the tune X of beam position, effectively increasing the beam current stability and quality.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP046
About •	paper received ※ 12 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP053	Test Results of the Low-Stored-Energy -80 kV Regulator for Ion Sources at LANSCE	1369
	J.T. Bradley III, L.N. Merrill, G. Rouleau, W. Roybal, G. Sanchez LANL, Los Alamos, New Mexico, USA
	Funding: Work supported by the U. S. Department of Energy. The H⁻ ion source at the LANSCE accelerator facility uses an 80 kV accelerating column to produce an H⁻ ion beam. A regulated power supply maintains the source and support equipment racks at -80kV with respect to local ground. As the facility’s H⁻ beam currents have been increased, voltage droop on the regulated -80 kV power supply has become one of the limiting factors on beam current. The previous regulator used a standard 120kV DC HV supply and a high power planar triode in series to regulate the voltage down to 80 kV and to stop the flow of current during an arcdown of the -80 kV accelerating column. In 2018 we devised a method of using a pair of standard, 50 kV capacitor charging supplies to produce the required 80 kV with minimal stored energy and significantly better voltage regulation over the beam pulse. This configuration has been tested on the Ion Source Test Stand and is being considered for installation on the main LANSCE linac. We will present the design, modeling and measured results of the new system as compared with the performance of the previous system.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP053
About •	paper received ※ 14 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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TUPTS034	Development of Low Inductance Circuit for Radially Symmetric Circuit	2013
	T. Takayanagi, K. Horino, T. Ueno JAEA/J-PARC, Tokai-mura, Japan
	Radiation symmetric type circuits using semiconductors of SIC-MOSFETs, one of next generation semiconductors, are composed of circuits in which many semiconductor switches are multiplexed in series and in parallel. Since the lengths of all parallel circuits are equal, the output waveform will not be distorted due to timing jitter or level change. This circuit is useful for outputting the waveform of ultrafast short pulse. Therefore, we have developed a circuit that achieves further low inductance by making the power transmission circuit into a double circular ring structure equal to the coaxial shape. Compare the inductance value obtained from the structure and the output waveform. In addition, we compare the calculation and the actual measurement in the actual test and present the verification result of the developed circular ring structure.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS034
About •	paper received ※ 01 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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Paper

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Design and Experimental Results of a 1.1kA/800V AC Power Supply for Sirius Booster Dipoles

1227

C. Rodrigues, G.O. Brunheira, B.E. Limeira, G.M. Rogatto
LNLS, Campinas, Brazil

Sirius is a 4th generation synchrotron light source de-signed and being built by Brazilian Synchrotron Light Laboratory (LNLS), with first beam scheduled for 2019. Approximately thousand power supplies (PS) will be needed to feed all the magnets, being 57 to operate the booster injector. The two booster dipole PS are the most complex, not only due to their higher current (1.1 kA), voltage (800 V) and power (333 kW) output, but also because the current must follow a quasi-triangular waveform, from a value close to zero to almost the maximum in 320 ms and at a repetition rate of 2 Hz. Due to the high output values, each PS is formed by two sets in parallel of 4 modules in series, what means 8 modules with 550 A / 200 V output. In order to reduce the 2-Hz effect in the grid, each module has two main stages. The input stage has the function to regulate the average voltage in a capacitor bank consuming a constant RMS current from the grid, which value depends on of the PS average output power. The output stage has the function to transfer the energy from the capacitor bank to the load, with the output cur-rent following the reference waveform. This work describes this PS, showing its topology, some aspects of its design and obtained results.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP001

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paper received ※ 13 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP002

Overview of Sirius Power Supply System

1230

C. Rodrigues, G.O. Brunheira, B.E. Limeira, R.J. Marcondeli, M.G. Martins, G.R. Oliveira, A.R.D. Rodrigues, G.M. Rogatto, A.P.A. Silva, A.R. Silva, H. Sousa
LNLS, Campinas, Brazil

Sirius is a 4th generation synchrotron light source designed and under construction by Brazilian Syn-chrotron Light Laboratory (LNLS), which first beam is scheduled to operate in 2019. Almost a thousand Pow-er supplies (PS) will be needed to feed all magnets of the magnetic lattice, with outputs ranging from 10A to 1.1kA and 50W to 333kW. Almost all power supplies were designed at LNLS. Only three families of power modules were de-signed: low power (FBP), high power (FAP) and AC (FAC). Each PS can have up to 8 modules in a parallel or/and series association, in order to reach the rated output values. All PS are digitally controlled by the same hardware and firmware, also developed by LNLS, called Digital Regulation System (DRS), but with different parameter settings. The DRS is also responsible by the communi-cation with other systems, PS monitoring, data man-agement, etc. This work presents an overview of this system, showing the PS specifications, family topologies and results of tests.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP002

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paper received ※ 13 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP011

Storageless Resonant Converter for Accelerator Magnets

1248

M. Cautero, T.N. Gucin
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

Elettra Sincrotrone Trieste, a specialized research centre generating high quality synchrotron radiation, has been in operation since 1993 and was revised in 2009. Recently, Elettra has been funded for a complete renewal of the storage ring. For the new machine, it is planned to employ state of the art converters, mostly of which will be designed in-house. For this purpose, it has been decided to evaluate the performance of a storage-less resonant converter, pro-posed by Dr. Slobodan Ćuk, which is a step down DC/DC converter consisting of four switches, one resonant capac-itor and two resonant inductors. For this purpose, the voltage conversion ratio of the converter has been de-rived. The topology was confirmed with simulation and a PCB layout has been designed, which is still to be tested.

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paper received ※ 08 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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TUPMP012

Power Converters for the ESS Warm Magnets: Procurement Status

1251

R. Visintini, M. Cautero, T.N. Gucin
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
C.A. Martins
ESS, Lund, Sweden

In the frame of the Italian In-Kind collaboration for the construction of the European Spallation Source (ESS), Elettra Sincrotrone Trieste research center is in charge, among all, of the provision of the power converters for the warm magnets of the superconducting part of the linear accelerator and of the proton beam transport line. The procurement process is running for all types of power converters. The first components have been delivered to ESS already in March 2018, while the Dipole and Quadrupole power converters are under construction. The first batches have been factory tested and shipped to Lund. The corrector power converters have been manufactured and are currently tested and calibrated at Elettra before their delivery to ESS.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP012

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paper received ※ 09 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP014

Digital Control System of High Precision Magnet Power Supply for SPring-8-II

1259

C. Kondo, K. Fukami, S. Takano, T. Watanabe
Japan Synchrotron Radiation Research Institute (JASRI), RIKEN SPring-8 Center, Hyogo, Japan
T. Fukui, H. Tanaka
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
S. Nakazawa
SES, Hyogo-pref., Japan
N. Nishimori
QST, Tokai, Japan
C. Saji
JASRI/SPring-8, Hyogo-ken, Japan

For the SPring-8 upgrade plan, SPring-8-II, a variety of magnet power supplies (PS) from 10 W to larger than 100 kW with a high current stability of about 10 ppm (pk-pk, typ.) are required. In order to develop the PSs within a given time and budget, we plan to use a common control system based on a digital control technology that can be adopted for the variety and the high precision PSs. The system consists of a high-precision analog-digital converter (ADC) circuit and a field programmable gate array (FPGA). Since the precision of the ADC circuit determines the current stability of the PS, we first developed the ADC circuit of high accuracy of less than 10 ppm (pk-pk). A proportional-integral (PI) control logic and a digital pulse width modulation (PWM) function was implemented in the FPGA firmware. These functions can be easily modified for each power supply by a desktop computer. We prototyped a DC power supply equipped with the newly developed digital feedback control system and confirmed that the current fluctuation was suppressed to less than 10 ppm (pk-pk). In the presentation, we will report the current status and future perspective of our power supply development including the evaluation results of the new circuits and the power supply we have developed.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP014

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paper received ※ 16 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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TUPMP015

Magnet Power Supply Calibration with a Portable Current Measuring Unit at the J-PARC Main Ring

1263

K. Miura, Y. Kurimoto, Y. Morita, D. Naito, T. Oogoe, T. Shimogawa
KEK, Ibaraki, Japan
Y. Kuniyasu
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
K. Ooya
SANKYU PLANT TECHNO CO., LTD., 6-5-3, Kachidoki, Japan
R. Sagawa
Universal Engineering, Ibaraki-ken, Japan

In the J-PARC MR, 96 bending magnets (BMs) are used in total. They are divided into 6 groups of 16 BMs. The 16 BMs in each group are connected in series and driven by a single power supply. Since all 96 BMs are symmetrically located in the ring, the magnet currents regulated by the 6 power supplies need to be same. Each power supply performs output current feedback control using electronic circuits including analog amplifications and AD / DA conversions. Due to individual differences of the electronic circuits, output current is generally expected to be different for each power supply. Therefore, we developed a current measurement unit with the portable DCCT as an independent reference. Further, we measured the magnet currents regulated by the 6 BM power supplies using the unit. We report the details of the unit as well as the results of the current measurements.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP015

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paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP016

New Power Supply of Main Magnets for J-Parc Main Ring Upgrade

1266

T. Shimogawa, Y. Kurimoto, K. Miura, Y. Morita, D. Naito
KEK, Ibaraki, Japan
R. Sagawa
Universal Engineering, Ibaraki-ken, Japan

It is plans that the proton beam power provided to experimental facilities increase with shortening repetition period in J-PARC Main Ring (MR). As the shorten repetition period, the replacement of the power converters for main magnets in J-PARC MR is necessary to cope with issues such as power fluctuation of the main grid and increase of the output voltage. We have considered and developed the power converters with a 10 MW class which have the capacitor banks with the large capacitance. In the end of 2017, the first new power converter for a bending magnets family, which is the largest power converter in this upgrade plan, was installed in J-PARC site and the power test is ongoing using a dummy and a real load. In this report, the first new power converter for a bending magnets family in J-PARC MR is reported including the test results.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP016

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paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP017

Design of Scanning Magnet Power Supply for HUST-PTF

1269

X.Y. Li, Y.Y. Hu, Y.J. Lin, P. Tan, X.D. Tu, Y.C. Yu, L.G. Zhang, Z.Q. Zhang
HUST, Wuhan, People’s Republic of China

An active scanning proton therapy facility is being de-veloped at Huazhong University of Science and Technol-ogy（HUST）. By controlling the deflection position of the beam with scanning magnets at different times, the superposition of discrete spot beams will form a specified shape and dose distribution conformal to the target tu-mour. A high precision and fast response power supply is required to deflect the beam quickly and accurately. In this paper, the TOSCA module in Opera3D is used to model and simulate the scanning magnets and to obtain the equivalent inductance of the magnet. Then the calcu-lated equivalent resistance inductance instead of the magnet is used to design the scanning magnet power supply. A high-voltage bridge is utilized to achieve fast response speed, and a low voltage bridge and PI control algorithm is adopted to ensure power supply accuracy. The Simulation result shows that the designed power supply meets the requirements of response speed and accuracy.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP017

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paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP020

The Research on the Calibration of Direct-Current Current Transformers

1280

C. Han, Y. Gao, X.L. Guo, P. Liu
IHEP, Beijing, People’s Republic of China

The measurement accuracy of direct current-current transformer (DCCT) is one of the key factors influencing the output of high-precision direct current power supply. In this paper, a calibration system designed by measuring resistance principle with a high accuracy direct current comparator (DCC) was presented for DCCT whose measurement accuracy is better than 10^-5. The system can achieve high-precision calibration of DCCT within the measurement range of 0-400 A, and the uncertainty of the system calibration is better than 1.1×10-6 in the whole range. The accuracy and linearity of DCCT are tested to verify the accuracy of the whole calibration system, thereby the current accuracy of the magnet power supply can be further improved.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP020

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paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP022

Research on Digital Scanning Power Supply Technology for Proton Therapy System

1286

J. Huang, M. Fan, J. Yang, L.G. Zhang
HUST, Wuhan, People’s Republic of China
T. Yu, C. Zuo
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People’s Republic of China

Funding: Work supported by The National Key Research and Development Program of China, with grant No. 11505068
Proton has great advantages in the field of cancer radiotherapy because of its good characteristic of Bragg peak. HUST-PTF is a proton therapy facility under development in Huazhong University of science and technology. It delivers the beam to the patients with a pencil beam scanning nozzle. Scanning power supplies are placed in the nozzle of the proton therapy device and they are required high accuracy, high speed and high stability. In this paper，the structure diagram of HUST-PTF is shown. The parameters of scanning magnets and its power supply are introduced. Finally, some test results of power supply are shown. The next work will debug the control system of the scanning power supply and adjust it with the scanning magnet to see if it meets the design requirements.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP022

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paper received ※ 19 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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TUPMP023

Design of Digital Controller for Multi Module Series-parallel Accelerator Power Supply

1288

J. Li, Y. Liu, X. Qi, W.Q. Zhang
IHEP, Beijing, People’s Republic of China

Funding: Supported by funds, Key laboratory of particle Acceleration Physics & Technology, Institute of High Energy Physics, Chinese Academy of Sciences，Project number：Y5294107TD
With the development of accelerators, Accelerator physics require power supply output high voltage and current (Peak power reached MWs). And the current stability requirements better than 10ppm. Therefore, the power supply is mostly used in the mode of module series-parallel. However, during actual commissioning, the power supply often does not run at rated current. If the power supply is running at less than 30% of the rated current, the power output current stability will drop sharply. This topic designed a set of digital controller for multi-module serial-parallel control. The digital controller can automatically adjust the number of input modules according to the current setting, and can automatically allocate the required PWM number of the module. While taking into account the synchronization between the various modules, Ensure the power supply is always running at an optimal working condition. Through a special AD conversion hardware design and advanced closed-loop controller algorithm, the digital controller can provide up to 20 high-resolution PWM signals to drive power conversion devices.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP023

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paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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TUPMP024

Research on Module Design and Network Management of Accelerator Power Supply System

1291

Y. Li, S.Y. Chen, C. Han, P. Liu
IHEP, Beijing, People’s Republic of China

Accelerator power supply system is a very special system. Many factors such as high number of power supplies, uninterrupted operation and unreasonable design lead to high failure rate, long maintenance time and the discovery of the fault is not timely, which bring a lot of unnecessary troubles to the operator. In this paper, a networked control method for accelerator power supply is studied, and the power supply parallel connection technology is used to maximize the trouble-free time of the power supply and increase the redundancy performance of the power supply. With independent networked control, the accelerator power supply system becomes a whole, no longer relying solely on the control of the accelerator control system, but in a network system with self-diagnosis and self-healing. Through the monitoring and management of the upper computer, the power supply system will be work stable, and the function of remote operation and remote repair of the power supply is realized finally. This is a research direction for the operation of large accelerator power supply systems in the future.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP024

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paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP025

Design of Fast Corrector Magnet Power Supply for HEPS

1294

SUSPFO065

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P. Liu, C. Han, F. Long
IHEP, Beijing, People’s Republic of China

High energy photon source is a fourth-generation synchrotron radiation light source with energy of 6Gev and ultra-low emittance (<0.1nm’rad). The ultra-low beam emittance requires high beam stability. Therefore, we develop a fast correction power supply with high bandwidth and low current ripple to improve the performance of the fast close orbit correction sys-tem to prove the high beam stability. The power supply adopts FPGA for full-digital control and use high speed ADC with temperature control. The power sup-ply has a small signal-bandwidth of 10 kHz and output current ripple lower than 20ppm. In this paper, we will describe the hardware design and software control methods and the test results will be demonstrated

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP025

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paper received ※ 13 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP027

Research and Design of Digital Magnet Power Supply Controller

1297

Z.X. Shao, H. Gao, G. Liu, P. Liu, X.K. Sun, H.Y. Zhang
USTC/NSRL, Hefei, Anhui, People’s Republic of China

Funding: Supported by’the Fundamental Research Funds for the Central Universities’（WK2310000064）
Hefei Advanced Light Source (HALS) is the fourth-generation radiation light source in China which is under design. Ultra-low beam emittance requires higher performance of power supply system. The power supply controller is a key part of the power system. This article describes the design and testing of high-stability power controllers and fast corrector power supply controllers. A new controller architecture is proposed for the problems of the two controllers.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP027

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paper received ※ 29 April 2019 paper accepted ※ 18 May 2019 issue date ※ 21 June 2019

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TUPMP028

Research Progress of Power Supply System in HALS

1300

SUSPFO068

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Z.X. Shao, H. Gao, G. Liu, P. Liu, L. Wang, H.Y. Zhang
USTC/NSRL, Hefei, Anhui, People’s Republic of China

Funding: Supported by ’the Fundamental Research Funds for the Central Universities’（WK2310000064） Supported by the Hefei Advanced Light Source Pre-research Project.
Hefei Advanced Light Source (HALS) is the fourth generation light source in China’s planning and construction. In order to achieve the diffraction limit of the emission and improve the beam quality, the research on magnet power supply (MPS) technology is essential. We have designed a variety of solutions for different power supplies. We designed the first version of the high stability power supply control card. The first version of the high-stability power supply control card was designed and tested with a small power module. Our pre-research system has developed a corrector magnet power supply with a small signal response bandwidth higher than 10 kHz. The developed power prototypes all use self-developed controllers, and most of the test results can meet the requirements. This article describes the progress of the HALS power supply system.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP028

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paper received ※ 08 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP032

Design of Analog to Digital Converter Scheme for High - Precision Electromagnet Power supply

1309

M.J. Kim, Choi. Choi
POSTECH, Pohang, Kyungbuk, Republic of Korea
J.H. Han, S.-H. Jeong, Y.G. Jung, H.-S. Kang, D.E. Kim, H.-G. Lee, S.B. Lee, S.J. Lee, B.G. Oh, K.-H. Park, H.S. Suh
PAL, Pohang, Kyungbuk, Republic of Korea
M.S. Kim
Dongguk University, Seoul, Republic of Korea

This paper deals with the design of an analogue-to-digital converter (ADC) scheme for a highly precise magnet current supply (MPS). The MPSs are requires with stable and precise current specification in range of the ppm. To meet the requirements, the AD circuit is composed of parallel ADCs of low-medium resolution. Digitally, the oversampling and averaging are performed to increase both the effective resolution and the signal to noise ratio (SNR). The implemented AD circuit was improved about 18 dB (32 times oversampling). The MPS applied by the proposed ADC scheme provides more precise control and the stable current within 10 ppm at 200 A. The experiment used a dipole magnet of the PAL-XFEL and its results proved feasibility through precisely measurable DVM3458A (Keysight Co.).

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP032

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paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP034

A Modular Optical Firing Interface for CERN’s Generic Power Converter Control Platform

1315

M. Di Cosmo, T.G. Gaime, B. Todd
CERN, Geneva, Switzerland

The power converters group at CERN has developed a third generic converter controller (FGC3) and regulation platform (RegFGC3), capable of controlling any of CERN’s power converters. This platform provides electrical connections to the low-level control elements of power converters, and in some cases a galvanic isolation is required between the converter controller output, and the power converter under control. To meet these requirements, a generic modular optical firing platform has been developed, which converts the electrical firing pulses from the RegFGC3 and FGC3 platforms into optical drive signals. Designed to be fully scalable, this platform provides various protection mechanisms to verify the integrity of the firing information. For example, checking for illegal firing states, dead-time, and drive errors. This paper describes the modular optical firing interface, the basic principles, and the configurations which are in use, or are planned to be used at CERN.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP034

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paper received ※ 15 May 2019 paper accepted ※ 17 May 2019 issue date ※ 21 June 2019

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TUPMP039

Data-driven Controller Design Using the CERN Power Converter Control Libraries (CCLIBS)

1335

A. Nicoletti, M. Martino
CERN, Geneva, Switzerland

The data-driven control approach is a control methodology in which a controller is designed without the need of a model. Parametric uncertainties and the associated unmodeled dynamics are therefore irrelevant; the only source of uncertainty comes from the measurement process. The CERN Power Converter Control Libraries (CCLIBS) have been updated to include data-driven H-infinity control methods recently proposed in literature. In particular, a two-step convex optimization algorithm is performed for obtaining the 2-degree-of-freedom controller parameters. The newly implemented tools in CCLIBS can be used both for frequency response measurement of the load and for controller synthesis. A case study is presented where these tools are used for an application in the CERN East Area Renovation Project for which a high-precision 900 A trapezoidal current pulse is required with 450 ms flat-top and 350 ms ramp-up and ramp-down times. The tracking error must remain within ± 100 parts-per-million (ppm) during the flat-top (before the ramp-down phase starts). The magnet considered in the case study is of non-laminated iron type, hence the necessity of data-driven techniques since the dynamics of such a magnet is difficult to be modeled accurately (due to eddy currents losses). The Power Converter used is a SIRIUS 2P (with a current and voltage rating of 400 Arms and 450 V, respectively) whose digital control loop is regulated at a sampling rate of 5 kS/s.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP039

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paper received ※ 08 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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TUPMP040

Impact of Flux Jumps on High-Precision Powering of Nb₃Sn Superconducting Magnets

1338

M. Martino, P. Arpaia, S. Ierardi
CERN, Geneva, Switzerland

Nb₃Sn superconducting magnets represent a technology enabler for future high-energy particle accelerators. A possible impediment, though, comes from flux jumps that, so far, could not be avoided by design unlike for NbTi technology. However, the impact of flux jumps on the powering has not been properly investigated to date. Flux jumps appear during current ramps at relatively low value of current and tend to disappear towards nominal current. They are usually detected as voltage jumps between different magnet coils but they might also produce overall voltage jumps across the magnet electrical terminals. Such jumps might perturb the power converter feedback control loop and therefore potentially jeopardize its precision performance during energy ramps. This work aims at : (i) presenting preliminary experimental test results on some HL-LHC Nb₃Sn model and prototype magnets, and (ii) attempting to build a simplified electrical model of the flux jumps (with focus only at its interaction with the power converter feedback control loop). Such work is a starting point for outlining possible power converters control strategies able to minimize flux jumps impact on high-precision powering of Nb₃Sn superconducting magnets.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP040

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paper received ※ 23 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP046

Improvement the Bending Magnet Power Supply Performance for TPS Storage Ring

1353

B.S. Wang, C.H. Huang, J.C. Huang, C.Y. Liu, K.-B. Liu, Y.S. Wong
NSRRC, Hsinchu, Taiwan

In the TPS (Taiwan Photon Source) facility, current stability of the electron beam depends on the bending magnet power supply and an orbit FOFB system to compensate the magnetic field. Due to the output current stability of the bending magnet power supply drifts with temperature so the orbit FOFB system should be applied to fine tune magnetic field and the photon beam should circulate in storage ring. In this paper, to stabilize the temperature of regulation circuit’s temperature box of the bending magnet power supply, the long-term output current stability is improve from ± 50ppm to ± 10ppm, and orbit FOFB system substantially reduce the tune X of beam position, effectively increasing the beam current stability and quality.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP046

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paper received ※ 12 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP053

Test Results of the Low-Stored-Energy -80 kV Regulator for Ion Sources at LANSCE

1369

J.T. Bradley III, L.N. Merrill, G. Rouleau, W. Roybal, G. Sanchez
LANL, Los Alamos, New Mexico, USA

Funding: Work supported by the U. S. Department of Energy.
The H⁻ ion source at the LANSCE accelerator facility uses an 80 kV accelerating column to produce an H⁻ ion beam. A regulated power supply maintains the source and support equipment racks at -80kV with respect to local ground. As the facility’s H⁻ beam currents have been increased, voltage droop on the regulated -80 kV power supply has become one of the limiting factors on beam current. The previous regulator used a standard 120kV DC HV supply and a high power planar triode in series to regulate the voltage down to 80 kV and to stop the flow of current during an arcdown of the -80 kV accelerating column. In 2018 we devised a method of using a pair of standard, 50 kV capacitor charging supplies to produce the required 80 kV with minimal stored energy and significantly better voltage regulation over the beam pulse. This configuration has been tested on the Ion Source Test Stand and is being considered for installation on the main LANSCE linac. We will present the design, modeling and measured results of the new system as compared with the performance of the previous system.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP053

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paper received ※ 14 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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TUPTS034

Development of Low Inductance Circuit for Radially Symmetric Circuit

2013

T. Takayanagi, K. Horino, T. Ueno
JAEA/J-PARC, Tokai-mura, Japan

Radiation symmetric type circuits using semiconductors of SIC-MOSFETs, one of next generation semiconductors, are composed of circuits in which many semiconductor switches are multiplexed in series and in parallel. Since the lengths of all parallel circuits are equal, the output waveform will not be distorted due to timing jitter or level change. This circuit is useful for outputting the waveform of ultrafast short pulse. Therefore, we have developed a circuit that achieves further low inductance by making the power transmission circuit into a double circular ring structure equal to the coaxial shape. Compare the inductance value obtained from the structure and the output waveform. In addition, we compare the calculation and the actual measurement in the actual test and present the verification result of the developed circular ring structure.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS034

About •

paper received ※ 01 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)