IPAC2013 - List of Keywords (power-supply)

Paper	Title	Other Keywords	Page
MOPEA006	Operation and Performance Upgrade of the SOLEIL Storage Ring	feedback, vacuum, dipole, injection	73
	A. Nadji, F. Bouvet, P. Brunelle, A. Buteau, L. Cassinari, M.-E. Couprie, N. Hubert, M. Labat, J.-F. Lamarre, P. Lebasque, A. Lestrade, A. Loulergue, P. Marchand, J.L. Marlats, L.S. Nadolski, R. Nagaoka, M.-A. Tordeux SOLEIL, Gif-sur-Yvette, France
	SOLEIL delivers photons to 26 beamlines and 3 new ones are under construction together with the femtoslicing project. Up to 5 filling patterns are available for the users including a low alpha mode; all of them are in Top-up injection. The beam current for the users has been increased to 430 mA in the multibunch mode. The Storage Ring (SR) is running with a new optics incorporating an additional quadrupole triplet in one long straight section. The beam position stability remains excellent. Vertical positions from the dipole X-BPMs have been included in the orbit feedbacks loop with very encouraging results. A feedback loop maintaining the emittance coupling close to 1% for any Insertion Devices (IDs) configuration has been implemented. Up to 25 very diverse IDs are now installed on the SR, and several others are under design or construction. In house developments are being carried out in several domains such as construction of SR dipole power supply spare and of 70 kW-500 MHz solid state amplifiers, design of a pulsed multipole magnet for injection, and a Robinson wiggler, as well as a feasibility study of a local reduction of the emittance in one of the long straight sections.

MOPEA064	A New Long Pulse High Voltage Extraction Power Supply for FETS	extraction, high-voltage, ion-source, ion	228
	D.C. Faircloth, S.R. Lawrie, M. Perkins STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	A new 25 kV 2 ms 50 Hz extraction voltage power supply has been developed for the high performance H-minus ion source for the Front End Test Stand at the Rutherford Appleton Laboratory. The power supply has been designed to fit in a single 19 inch rack and has a modular design for easy maintenance. This paper details the design and performance of the power supply and extracted beam currents.

MOPWA002	New Purposed High Precision Power Supply For Quadrupole Magnets Of ILSF using Low Resolution Digital PWM	quadrupole, storage-ring, controls, feedback	664
	M. Jafarzadeh, M. Akbari, J. Rahighi, D. Shirangi, E.H. Yousefi ILSF, Tehran, Iran
	A total number of 10⁴ quadrupole magnets, split into 9 families, will be required for the ISLF storage ring lattice. Each quadrupole magnet is connected with its own independent power supply. In new design for quadrupole magnets, the outputs of two synchronized push-pull converters (one for coarse regulation and another for fine current regulation) will be added together before a synchronous rectification. In this manner, there will be no need for extra high-current electronic parts. Another advantage of this design is using a high-voltage inductor on the switching side rather than a high current inductor ion the high current side. The PWM signal to control of buck converter (at the input stage of each unit) will be generated inside a dsPIC .

MOPWA003	New Development of Compact Fast Pulsed Power Supply System in the SPring-8	kicker, high-voltage, radiation, pulsed-power	666
	C. Mitsuda, K. Fukami, K. Kobayashi, T. Nakanishi, H. Ohkuma, S. Sasaki JASRI/SPring-8, Hyogo-ken, Japan T. Ohshima RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
	We have developed a compact fast pulsed power supply system as a part of the development of the fast kicker magnet system in the SPring-8 storage ring. The kicker magnet is needed for the 1 ps short pulsed X-ray generation by a vertical kick and the suppression of the fast beam oscillation by counter kick. The required pulse width and current for above applications have to be a enough short time less than 4.8 us of the revolution time and more than 200 A respectively. We selected a Si-MOSFET as a switching device because a MOSFET has two capabilities of the fast switching and high-voltage resistance, and has a smaller size than an IGBT. The current are increased by parallel or parallel-series connecting of MOSFETs. We started the development of a test system whose output current was a 67 A with a pulse width of 1.0 us in 2008. From 2009 to 2011, we succeeded in achieving the output current of a 270 A with a pulse width of 0.8 us by using prototype system. In 2012, by increasing the number of MOSFET, we confirmed the output current of 250 A with a pulse width of 0.5 us, whose case size is a just 210(W) x 160(H) x 300(D) mm. We will report the development status in detail.

MOPWA004	Development of a Non-inductive Ceramic Resistor	kicker, injection, pulsed-power, impedance	669
	T. Sugimoto, K. Fan, K. Ishii, H. Matsumoto KEK, Ibaraki, Japan K. Abe Hitachi Haramachi Electronics Co. Ltd., Hitachishi, Ibaraki, Japan S. Fukuoka University of Tsukuba, Graduate School of Pure and Applied Sciences,, Tsukuba, Ibaraki, Japan
	Non-inductive ceramic resistors, based on alumina and carbon, are used for impedance matching in the circuit of the J-PARC main ring injection kicker system. The kickers were installed in December 2011, and have been in operation successfully since then. However, discharges at the edge of the ceramic bulk were observed after several weeks’ operation, which increase resistance from O(100) to O(1M). Investigation indicates that poor contact with the rough surface of the ceramic bulk due to irregular shaped spots causes micro-gaps, which trigger the discharge. In order to improve the contact, one type of brazing technology has been experimentally applied to one resistor. Another resistor had an annealed thin copper plate inserted, and both resistors were tested and compared. In this paper, we will describe details of the development of the resistors and give future prospects.

MOPWA005	Development of a Feedback Control System for Resonant Power Supplies in the J-PARC 3-GeV Synchrotron	controls, feedback, impedance, quadrupole	672
	Y. Watanabe JAEA, Ibaraki-ken, Japan N. Tani JAEA/J-PARC, Tokai-mura, Japan
	In the J-PARC 3-GeV Synchrotron, dipole magnets and seven families of quadrupole magnets are excited with a DC-biased 25 Hz sinusoidal waveforms using an individual resonant circuits. This paper proposed a feedback system to improve the amplitude and phase stability, specially against variation of capacitance caused by temperature characteristics in the resonant circuits. The control system has been successfully demonstrated and achieved amplitude and phase stability under ±0.005% and ±0.5 uS, respectively.

MOPWA006	Magnet Power Supply with Small Ripple using Sub-converter and Symmetrical Structure	controls, feedback, sextupole, extraction	675
	S. Nakamura J-PARC, KEK & JAEA, Ibaraki-ken, Japan S. Yamada KEK, Tokai, Ibaraki, Japan
	High precision tracking and small current ripple are necessary for a magnet power supply of a high power accelerator. A prototype power supply of the 100kW class is developed with an aim of small current ripple less than 10ppm, which employs a combination of main and sub-converter with symmetrical structure. The main converter unit supplies pattern current by a voltage feedforward control, while the sub-converters by a current feedback control. The symmetrical structure of the power supply is adopted to decouple normal mode and common mode ripples. Each converter unit is modularized and surrounded by a Faraday cage suppress for suppressing radiation of electrical noise and ease for maintenance. Its performance is studied using a set of 24 units of setupole magnets installed in J-PARC Main Ring.

MOPWA008	Power Supply of the Pulse Steering Magnet for Changing the Painting Area between the MLF and the MR at J-PARC 3 GeV RCS	injection, superconductivity, proton, controls	681
	T. Takayanagi, N. Hayashi, K. Horino, M. Kinsho, T. Togashi, T. Ueno, Y. Watanabe JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan Y. Irie KEK, Ibaraki, Japan
	The power supply of the pulse steering magnet (PSTR) has been produced. The PSTR of the 3-GeV RCS (Rapid Cycling Synchrotron) in the J-PARC (Japan Proton Accelerator Research Complex) aims at changing the painting area in a pulse-to-pulse mode at 25Hz between the MLF (Material and Life science Experimental Facility) and the MR (50-GeV Main Ring synchrotron) at J-PARC. The power supply has the equipment used to excite the pulse current and the direct current (DC) to correspond to two modes that the paint injection for beam users and the central injection for beam commissioning. In case of the paint injection, the power supply excites the current from 40 A to 450 A in pulse mode, which has the capability to switch from positive to negative polarity. The pulse current has been performed with good accuracy whose deviation to a setting current becomes to be less than ± 0.2 %. In case of the central injection, the power supply excites the current from 1000 A to 3000A in DC mode, which has been realized output current deviation below ± 0.01 %. This paper summarizes the design parameters and the experimental results of the power supply.

MOPWA009	Development of a Fast Compensation Kicker System for J-PARC Main-ring Injection	kicker, injection, simulation, impedance	684
	S. Fukuoka University of Tsukuba, Graduate School of Pure and Applied Sciences,, Tsukuba, Ibaraki, Japan K. Fan, K. Ishii, H. Matsumoto, T. Sugimoto KEK, Ibaraki, Japan
	Injection system of J-PARC main ring employs four lumped kickers to deflect the incoming beam. The residual field caused by tail and reflection of excitation current increases the closed beam orbit leading to particle loss in high power operation. A correction method using a fast kicker system to compensate the remaining angle is being developed. Doe to the narrow bunch spacing, transmission line kicker is selected to satisfy requirements of fast rise and fall time. The kicker magnet uses ceramic capacitors instead of parallel metal plates to make the magnet compact and reduce the stray inductance. Capacitors are installed in vacuum chamber. A very thin core is used to reduce distributed inductance. A bandwidth is calculated as 160 MHz. A Marx generator using FET switches has been studied, which is able to produce fast rise and fall time as 50 ns. Any pulse shape is generated by choosing switches to fire. A prototype magnet and a power supply have been fabricated for parameters test. In this paper, we will report the details of the system design, analyze the measurement results and give future prospects.

MOPWA014	Research and Design of Digital Power Supply for HIRFL-RIBLL Corrector Magnet	controls, feedback, secondary-beams, ion	690
	Y.Z. Huang, Y.X. Chen, D.Q. Gao, J.B. Shangguan, R.K. Wang, H.H. Yan, Z.Z. Zhou IMP, Lanzhou, People's Republic of China
	One digital power supply was designed for RIBLL (Radioactive Ion Beam Line in Lanzhou) corrector magnet at HIRFL (Heavy Ion Research Facility in Lanzhou). Adopting two parallel connected IGBT full-bridges as the power circuit topology, the power supply can generate bipolar DC current when it runs in the fourquadrant working states, which well meets the requirements of corrector magnet. SOPC platform of Altera based on Nios II is chosen to design the digital power supply regulator. Employing FPGA as the control core and utilizing SOPC principles, the digital regulator is designed against special requirements of accelerator power supply. The test results indicate that performance of the power supply can meet the design requirements.

MOPWA015	The Control Strategy Research on Two Kinds of Topological Pulse Power Supply	controls, pulsed-power, heavy-ion, quadrupole	693
	C.F. Shi, D.Q. Gao, Y.Z. Huang, H.H. Yan, Z.Z. Zhou IMP, Lanzhou, People's Republic of China
	This paper introduces a kind of pulsed power supply at HIRFL-CSR，analyzes the ripple and current error of the quadrupole magnet power supply in the operation process, and gives a two-stage topology of pulsed power supply. The control method is simulinked and the results show that the new one can make up for the deficiencies of the existing pulse power supply and the main circuit structure and control method are feasible.

MOPWA018	CW-type HV Power Supply of 50 Hz and its Application in Accelerator Power Supply	high-voltage, electron, impedance, damping	699
	Z.-F. He, D.M. Li, Y.H. Liu, S.L. Wang, J.-L. Zhang, Y.-T. Zhang SINAP, Shanghai, People's Republic of China
	Funding: The Knowledge Innovation Program of Chinese Academy of Sciences 　　The high-voltage power supply is an integral part of accelerator technology, as its stable and reliable output is an important guarantee for accelerator properly working. In a number of engineering practice of accelerator design and construction, we tried to use the Cockcroft-Walton (CW) type of power supply driven by 50 Hz and got success. It is of simple structure, low cost, easy maintenance, and high efficiency. This report describes the technical difficulties and the solutions in the CW-type power supply driven by 50 Hz. It also gives an introduction of the latest design of 800 kV/30 mA electron accelerator, which is being assembled at SINAP. Recent work has shown that it is an option to choose 50 Hz driven power system when it is more lenient on the voltage ripple but needed to be as high as possible on the energy conversion efficiency.

MOPWA019	Digital Power Supply Controller Development Based on FPGA	controls, booster, synchrotron, synchrotron-radiation	702
	R.N. Xu, C.L. Guo, D.M. Li, R. Li, S. Tan, W.F. Wu SINAP, Shanghai, People's Republic of China
	A digital power supply controller of SSRF (Shanghai Synchrotron Radiation Facility) adops advanced DSP, FPGA and precision ADC as core unit and data acquisition unit. The controller, which is embedded in the power supply case, is composed of two cards, DSP card and ADC card. The controller can communicate with IOC by optical fiber via the Ethernet, Manchester or RS-232 port. The parameters of adjusting power supply can be easily changed to achieve high stability and repeatability. The long-term stability is better than 20ppm. The resolution of current is better than 5ppm. As a replacement of imported PSI controller, the controller is mainly used in middle power supplies in SSRF, and it could accord with all the technical requirements of the facility.

MOPWA021	Design of the Air Cooling System for the High Voltage Power Supply of a Electron Accelerator	high-voltage, simulation, radiation, electron	705
	F. Zhong, X. Lei, J. Yang, L. Yang HUST, Wuhan, People's Republic of China
	High voltage electron accelerators are widely applied in many fields of radiation pro-cessing,and the high voltage power supply is the critical equipment for the accelerator. for the requirement of high voltage, the design of locate the power supply in a steel barrel filled with SF6 is commonly used. Considering the various losses of the power supply, an air-cooling system is needed. This paper presents the design of the air-cooling system for the high voltage power supply. The fluid simulation of SF6 based on Fluent and the optimal design of the air duct's structure and the thermal efficiency have been done. The comparison and analysis of the simulation and the empirical formula result is also carried out. It illustrates the design of the air-cooling system can satisfy the demand of the heat radiation This paper also provides an effective method for the optimal design of the air duct's structure and the maximize efficiency of heat exchange.

MOPWA025	2Hz Ramping Mode Dipole Power Supply for Testing the NSLSII Booster Dipole Magnets	dipole, booster, controls, feedback	714
	A.I. Erokhin, A.V. Bulatov, K. Gorchakov, S.M. Gurov, V.V. Kolmogorov, A.A. Kremnev, D.N. Pureskin, D.V. Senkov, R.V. Vakhrushev BINP SB RAS, Novosibirsk, Russia
	Budker Institute has designed and delivered Booster for NSLSII project including vacuum system, magnet system, diagnostics and power supplies. Dipole power supplies were directly delivered to BNL by sub-contractor (Danfysik, Denmark). To test dipole magnets on factory side, at BINP, it was decided to design and construct a high current ramping mode power supply. The designed power supply can operate with the reactive output power up to 150kVA and output current up to 900A at 2Hz ramping mode. The absolute accuracy achieved is better than 100ppm for the injection and extraction flats and better than 500ppm for the ramps.

MOPWA027	Pulse Power Supplies for Kicker Magnets of NSLS-2 Booster Ring	injection, kicker, extraction, booster	720
	A.A. Korepanov, A. Akimov, A.A. Pachkov, A. Panov BINP SB RAS, Novosibirsk, Russia
	A set of identical ferrite kicker modules is utilized for the injection and extraction of the NSLS-2 booster ring. The pulse power supplies of these modules are based on the PFN-thyratron design. The pulse current amplitude of up to 4 kA at 300 ns flat top duration and PFN charging voltage of up to 23 kV were achieved on the extraction pulsers. The pulse to pulse repeatability of the output current waveform was measured and made up to 0.05% (σ) at nominal current for the extraction pulsers. The injection pulsers have a specification on the reverse current overshoot to be less than 0.5% of the amplitude. To fulfill this requirement a single turn saturated choke in the thyratron circuit was used. The design and the test results of the power supplies on NSLS-2 site are presented in the paper.

MOPWA040	Bipolar 10A and 50A Magnet Power Supplies for SwissFEL	controls, beam-losses, monitoring	756
	R. Künzi, M. Emmenegger PSI, Villigen PSI, Switzerland
	15 years ago the Power Electronics Group at PSI, Switzerland developed power supplies (PS) for the magnets of the Swiss Light Source (SLS). These PS are based on switched mode converters with fully digital control. During the 12 years of operation of the SLS they have shown a very good reliability but also revealed some potential for improvement: After several years of operation the many fans installed started to fail more frequently and the same was observed for “off-the-shelf” AC/DC converters for the DC link. For the new SwissFEL, which shall be in service by 2016, approx. 610 PS rated at 10A and 40 PS rated at 50A will be necessary. As for any accelerator application high stability and reliability of the magnet PS are essential for high beam quality and availability. The development of the SwissFEL PS aims to raise the already good reliability by omitting as many fans as possible and adding redundancy for the AC/DC converters. Presently, a prototype rack with 21 10A PS is available and the mass production has started. The presented paper describes the PS concept and test results of the prototype regarding stability and efficiency are given.

MOPWA045	The Pulsed Power Supply System for TPS Project	injection, kicker, booster, storage-ring	771
	C.-S. Fann, C.L. Chen, K.T. Hsu, S.Y. Hsu, A.P. Lee, K.-K. Lin, K.L. Tsai NSRRC, Hsinchu, Taiwan
	The pulsed power supply system for TPS project consists of three types of pulser for booster injection/extraction and storage ring injection. Categorizing by the delivered peak current, pulse shape base-width, they are for: 1) booster kicker: 500 A, square, 1 μs; 2) storage ring kicker: 5 kA, half-sine, 5 μs; 3) transfer line septum: 10 kA, half-sine, 300 μs; respectively. All together, there are 10 units constructed for the associated pulsed magnets. In this report, the test results of the pulsed power supplies will be summarized and the measured results of their performance are presented.

MOPWA046	The Multi-channel Measuring Data Acquisition Interface for TPS Quadrupole and Sextupole Magnet Power Supplies by using LabVIEW as the Developing Tool	quadrupole, sextupole, controls, LabView	774
	B.S. Wang, Y.-C. Chien, C.-Y. Liu, K.-B. Liu NSRRC, Hsinchu, Taiwan H.P. Tsai Chroma ATE Inc., Taiwan
	This paper presents an implementation of a multi-channel measuring data acquisition interface of quadrupole and sextupole magnet power supplies (MPS) for Taiwan Photon source (TPS) withLabVIEW as the developing tool. The multi-channel measuring data acquisition interface could reduce quantity of measurement instrument and loading of operator at the MPS acceptance test. The instrument devices of measurement system include a multiplexer 、 a dynamic signal analyzer (DSA) and a multi-channel digital voltage meter (DVM), GPIB is the communication protocol betweenthe multi-channel measuring data acquisition interfaceand instruments. There are threeanalyzing procedure for the output currentof MPSin the default setting of the LabVIEW program, 1) Fast Fourier Transform of output current measured by DSA, 2) long-term stability of output current measured by DVM, 3) the linear error function fitting of output current by LabVEW toolbox;after these three analyzing procedureis completed, the performance of each MPS can be automatically generatedas a Microsoft Word report file.

MOPWA047	Development of a Digital Control Interface Card with a LabVIEW Control Program for TLS Corrector Magnet Power Supply	controls, LabView, feedback, monitoring	777
	B.S. Wang, K.-B. Liu NSRRC, Hsinchu, Taiwan
	This paper presents an implementation of a virtual instrument control interface and a digitally controlled interface card for Taiwan Light Source (TLS) corrector magnet power supplies (MPS). Eight pieces of corrector MPS converter module are monitored and controlled by the digitally controlled interface card with delimit boundary of ±10 voltage. The digitally controlled interface card was implemented with an ADS1278 24-bits multi-channel analog-to-digital converter、a DAC8718 16-bits multi-channel digital-to-analog converter and the TMS320F28335 digital signal processor. There are two control modes of the virtual instrument control interface, which are 1) local control mode by RS-232, 2) the remote control by MiiNePort\_E1 TCP/IP protocol; with the developed Labview control interface the user can choose which mode to communicate with the corrector magnet power supplies depending on the working environment.

MOPWA048	The Cable Engineering Project for the TPS Power Supply	booster, storage-ring, dipole, sextupole	780
	C.-Y. Liu, D.-G. Huang, K.-B. Liu, B.S. Wang NSRRC, Hsinchu, Taiwan
	The civil engineering of Taiwan Photon Source will soon be completed. The engineering of the power supply cabling should be done in advance of the schedule for the completion of the civil engineering. Using software (SolidWorks) to build a 3-D model, we obtain detailed cabling information because the model is made to scale 1 to 1. As all components are built into the model of the TPS accelerator, we can build accurately a model of the power supply cabling. For example, we can estimate every length and the total cable length for purchase and budget control. We can evaluate the conditions for every power cable to lay the cable tray from the power supply to the magnets, so we can lay every cable to follow the sequence in the cable tray. We thereby convert the drawing of the two-dimensional construction graph when we design the finished three-dimensional cabling model. The excellent and precise results are proved in this paper.

MOPWA067	Robust High-average-power Modulator	controls, klystron, neutron, pick-up	834
	I. Roth, N. Butler, M.P.J. Gaudreau, M.K. Kempkes Diversified Technologies, Inc., Bedford, Massachusetts, USA
	Funding: US DOE. Grant No. DE-SC0004254 Diversified Technologies Inc. (DTI) designed a modulator which meets the requirements of the Spallation Neutron Source (SNS) modulators at Oak Ridge National Laboratory and will be less expensive than copies of the current modulators. The SNS modulators, under development for a decade, still do not meet the specifications for voltage, droop, or pulsewidth. The modulators must provide pulses of 85 kV, 165 A, with pulsewidths of 1.5 ms and voltage flatness of 1%. The current modulator switches the full power at high frequency during each pulse, and has a complex output transformer. DTI designed a modulator that meets all specifications and is less expensive. The proposed design is cheaper because there is an HV switch that operates at full current only once per pulse, a corrector that switches only 5% of the power at high frequency, a low-cost transformer-rectifier power supply, and no output transformer. DTI’s patented switch uses IGBTs, allowing the switch to operate at full capacity even if 20% of the devices fail. The modulator will be installed in 2013 at SNS to test klystrons. DTI will present the system components of the design as well as the performance results to date.

TUOCB202	Fast Orbit Feedback Scheme and Implementation for Taiwan Photon Source	feedback, simulation, controls, EPICS	1146
	P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.Y. Wu NSRRC, Hsinchu, Taiwan
	TPS (Taiwan Photon Source) is a 3 GeV synchrotron light source which is being in construction at NSRRC. As most of 3rd generation light sources, 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, both of slow and fast correctors will be used for FOFB correction. In general, there are two schemes to operate these hybrid correctors. One is to transfer correction from fast to slow correctors periodically and avoid fast corrector saturation. The other is the fast correctors operated only at higher frequency domain and slow ones take care of DC part. TPS would adopt the first scheme but the second one still as a substitute. Both schemes will be supported. This report summarizes the infrastructure of the FOFB and the simulation is also presented.
	Slides TUOCB202 [3.035 MB]

TUPEA012	Rebunching Ultracold Neutrons by Magnetic Deceleration for the neutron EDM experiment at J-PARC	neutron, resonance, coupling, focusing	1187
	S. Imajo Kyoto University, Kyoto, Japan Y. Arimoto KEK, Ibaraki, Japan P.W. Geltenbort ILL, Grenoble, France Y. Iwashita Kyoto ICR, Uji, Kyoto, Japan M. Kitaguchi Kyoto University, Research Reactor Institute, Osaka, Japan Y. Seki RIKEN Nishina Center, Wako, Japan H.M. Shimizu Nagoya University, Nagoya, Japan T. Yoshioka Kyushu University, Fukuoka, Japan
	Ultra cold neutrons (UCN) - neutrons with energies less than 300 neV - can be accelerated or decelerated by means of static magnetic and RF fields. Neutron have a magnetic dipole moment, and hence their kinetic energies vary depending on their spin in magnetic fields. Their kinetic energies are restored when they get out from the magnetic field area if their spin did not flip. A spin flip can be triggered by applying an RF field whose frequency coincides with the spin precession frequency of a neutron in this magnetic field. This allows to tune the kinetic energy of neutrons. This method can be used to rebunch a pulsed beam of neutrons to a storage bottle that can store UCN. By open and close the storage bottle synchronously with the rebuncher, high UCN densities can be achieved for precision measurements of neutron properties such as the Electric Dipole Moment. The method and experimental setup are described in detail and the results of a recent first test experiments are presented.

TUPWO074	Reducing Spin Tune Spread by Matching DX Prime at Snakes in RHIC	quadrupole, simulation, proton, polarization	2030
	C. Liu, M. Bai, E.D. Courant, A. Marusic, M.G. Minty, V.H. Ranjbar, S. Tepikian, R.A. Thomas, D. Trbojevic BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. At the Relativistic Heavy Ion Collider (RHIC) at BNL the physics program includes collisions between beams of polarized protons at high beam energies. Maintaining the proton's polarization is vital and preserved primarily by application of a pair of Siberian snakes. Measurements from recent high-energy physics runs indicate polarization loss during acceleration between 100 and 250 GeV. Based on analytic estimations for off-momentum particles and/or beams, a nonzero difference in DX prime - the dispersion function angle - between the snakes can result in a shift in the spin tune, or equivalently, of the conditions of snake resonances in close proximity to the beam during acceleration. Requiring that DX prime at the two Siberian snakes in RHIC being equal would reduce the spin tune shift for off-energy particles so helping to maintain polarization during the energy ramp. Preservation of half-integer spin tune is also important for future operation of the spin flipper at store. In this report, the matching scheme and simulations using MAD-X will be presented together with a newly applied method based on response matrices.

WEPWA032	The Feed-forward Control Design of Correction Coil Power Supply for SSRF EPU	controls, EPICS, undulator, insertion	2199
	Q. Yuan, M. Gu, G.Y. Jiang, R. Wang SINAP, Shanghai, People's Republic of China
	The SSRF Elliptically Polarized Undulator (EPU) has been in operation for about three years. The feed-forward control algorithm of correction coil power supply (CCPS) is implemented in the Input and Output Controller (IOC) based on VME. The correction current responds not fast enough to gap movement, mainly because the communication between IOC and digital CCPS taking up much time. This paper introduces one new feed-forward design, that is ,on the one hand, the CCPS current responds to both gap movement and shift movement according to 2D Look-up Table(LUT) by linear interpolation method. On the other hand, feed-forward control algorithm is carried out in the EPU controller, and the CCPS with fast control response is directly controlled by PLC through analog interface. Thus, the correction current respond well to gap and shift movement owing to leaving out communication time.

WEPFI030	Design Studies on NSC KIPT Electron Gun System	gun, electron, high-voltage, cathode	2768
	Z.S. Zhou, Y.L. Chi, D.Y. He IHEP, Beijing, People's Republic of China
	In NSC KIPT, a neutron source based on a subcritical assembly driven by a 100MeV/100kW electron linear accelerator is under design and development. The linear accelerator needs a new high current electron gun. In this paper, physical design, mechanical fabrication and beam test of this new electron gun are described. The emission current is designed to be higher than 2A for the pulse width of 3us with repetition rate of 50 Hz. The gun will operate with a DC high voltage power supply which can provide up to 150 kV high voltages. Computer simulations and optimizations have been carried out in the design stage, including the gun geometry and beam transport line. The test results of high voltage conditioning and beam test are presented. The operation status of the electron gun system is also included. The basic test results show that the design, manufacture and operation of the new electron system are basically successful.

WEPFI033	Development of the HLS 40kW Solid State Amplifier	rf-amplifier, storage-ring, damping, synchrotron	2777
	L. Lin, G. Huang, C. Li, Y.T. Liu, W. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China
	A 40kW RF Solid State Amplifier (SSA) will replace the 25kW tetrode amplifier as the new RF power generator of HLS 800MeV electron storage ring. This SSA contains sixty-five 650W amplifier units (one unit drives sixty-four’s), with two-stage combination to reach the 40kW output. All of the components of SSA are prepared and tested, each of them meets the design requirements. The SSA has been assembled, and is in off-line testing now. The process of SSA’s design and manufacture, and the test results are presented in this paper.

WEPME033	Status of SSRF Fast Orbit Feedback System	feedback, EPICS, controls, synchrotron	2995
	C.X. Yin, B.C. Jiang, L.Y. Zhao SINAP, Shanghai, People's Republic of China
	As a 3rd generation light source, Shanghai Synchrotron Radiation Facility (SSRF) is pushing the requirement of beam stability to sub-micron in the range of DC to 100Hz. A fast orbit feedback system was designed and implemented to satisfy this requirement. In this paper, the layout of SSRF fast orbit feedback system, the structure of its electronics system and its hardware and software subsystems are described. The current status of SSRF fast orbit feedback system is presented.

WEPME064	Recent Development on Beam-based Alignment in RHIC	quadrupole, alignment, controls, dipole	3082
	J. Beebe-Wang, J.M. Ziegler BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. During the 2012 polarized proton and heavy ion runs, we continued the efforts on beam-based alignment (BBA) of quadrupoles in RHIC. A complete set of BBA data of triplet quadrupoles in all interaction regions of RHIC was obtained. In addition, the measurement procedures and data analysis were improved and the corresponding codes were developed. Here we report on the results of BBA measurements, analysis, and corrections. The model sensitivity, the measurement repeatability, and the BBA accuracy limitations are also discussed. As a continuing effort, we also present application code that is under development for future BBA operations in RHIC.

THPEA010	Design and Implementation of the Remote Control System of the Digital Magnet Power Supply of China Spallation Neutron Source	controls, EPICS, status, simulation	3167
	X. Wu, Y.C. He, J. Liu, C.H. Wang, J.C. Wang IHEP, Beijing, People's Republic of China
	The magnet power supplies of the China Spallation Neutron Source (CSNS) can be classified into three types: rapid cycling synchrotron (RCS) resonant power supplies, fast response power supplies and DC power supplies. All of the magnet power supplies are controlled by the intelligent controller called Digital Power Supply Control Module (DPSCM), which can regulate the current and voltage circuit. The DPSCM is developed by the power supply group. It has two RS232 communication interfaces. All the command setting and reading power parameters are transmitted by Modbus protocol. Therefore, we made the communication protocol based on Modbus RTU between the remote control system and the DPSCM. This paper introduces the design of the remote control interface to the DPSCM. We developed EPICS IOC applications and real-time database on MOXA embedded serial device DA710 and OPIs using Control System Studio (CSS) according to different kinds of the power supplies. We have tested the remote control system with these kinds of power supplies. The test result shows that the remote control system is stable and reliable and it can basically meet the requirements of power supply system and physicists.

THPEA018	Design of an Integrated Platform based on CSS and MATLAB for SSC-LINAC System Controlling and Data Analysis	controls, EPICS, linac, vacuum	3182
	M. Yue, S.Z. Gou, W. Zhang IMP, Lanzhou, People's Republic of China
	CSS is the abbreviation of Control System Studio and is widely used in particle accelerator experiments area. Based on Eclipse, it is a collection of tools which can display details of the PV, show alarm state, as well as the function of data browsers, archive engine and so on. CSS offers an integrated approach to build a control system. We have recently developed a control and monitor system for the SSC-LINAC system to control and monitor power supply, vacuum, high frequency, and other accelerator equipments. In the area of accelerator controlling, we often need to do some mathematical operations like Fourier transform of the monitored data to get some accuracy performances of interested equipments. Unfortunately, CSS cannot satisfy this requirement. It is well known that MATLAB plays very well in data process and provides many mathematical tools. If we can combine these two tools together, we can get better control strategy. In the presentation, we will discuss the design of this integrated platform to implement the display, control and data process.

THPEA020	The Design for Presetting Data Automatically in HIRFL Power Supply Control System	controls, LabView, heavy-ion, cyclotron	3187
	X.J. Liu, Y. Chen, K. Gu, A. Shi, J.Q. Wu, F. Yang, W. Zhang IMP, Lanzhou, People's Republic of China
	This article introduces the structure of power supply in HIRFL(Heavy Ion Research Facility in Lanzhou) and designs a program which can preset power supply data automatically. We use Labview which is produced by NI Corporation to read Excel, access the Oracle database and send the generated instructions to power supply controllers. This program brings great convenience to physicists. It is used in SSC(Separated Sector Cyclotron) power supply system. The result shows that we can preset data quickly and accurately.

THPEA021	A Platform Control System for 320 kV HV Platform	controls, high-voltage, ion, LabView	3189
	W. Zhang, K. Gu, J.Y. Li, X.J. Liu IMP, Lanzhou, People's Republic of China
	This article describes the platform control system applied to the Chinese Academy of 320KV HV platform for highly charged ions. This system is composed of the hardware and the software. The hardware is composed of the network controller based on ATmega128 core chip. Our control group has designed the network controller for controlling the different types of equipment on the platform. The control system achieves the reliability, stability control of the different types of equipment on the HV platform, and control of the network, improve operational efficiency. The software uses NI Corporation's LABVIEW to program user interface. We have established for the application modules of the network controller in the LABVIEW and realized the optimization of the network controller to configure and use. The platform control system has run three years in the 320KV HV platform.

THPEA022	The Remote Control System for LAPECR1	controls, ion, ion-source, high-voltage	3192
	W.X. Zhou, F.Y. Lin, J.F. Luo, Y.Y. Wang, J. Yin, Y.J. Yu, D.T. Zhou IMP, Lanzhou, People's Republic of China
	In order to support the debug of LAPECR1(Lanzhou All Permanent Magnet ECR Ion Source No.1) which merely provides H⁺ beam for HIRFL(Heavy Ion Research Facility in Lanzhou), a control system was realized in November 2011. The control system is composed of some controllers, a control-software and Intranet which is established by a switch. All of the controllers can access to Intranet directly or through serial-switch. And the controllers of the HV power and motor were designed by us. A IPC(Industrial Personal Computer) could control all of the equipments through Intranet. For the software of the system, it is designed using C++. And it could show the important data in the form of spectrum for the purpose of analysis and debug. The control system can acquire data and send command from/to the corresponding equipment.

THPEA024	The Control System of the SDUV-FEL Test Facility	controls, FEL, EPICS, PLC	3195
	J.G. Ding, S.M. Hu, G.Y. Jiang, H.F. Miao, H. Zhao, H.J. Zhu SINAP, Shanghai, People's Republic of China
	At SINAP, the Shanghai deep ultraviolet FEL test facility (SDUV FEL) was integrated to test the FEL key technologies and principles. The facility was constructed based on the existed SINAP 100MeV LINAC with modifications of cathode gun replacement and magnet compressor segment increment, extension of the undulator section, and the seeded laser system. The control system of the facility has been developed which upgraded and extended from the existed LINAC control system. The system was integrated based on the EPICS toolkit, consists of several subsystems of magnet power supply control, timing, vacuum monitor, RF control, undulator gap adjustment, and machine protection system. In this paper, the SDUV FEL control system is introduced. Solutions of equipment control, hardware and software implementations, and system integrations are described in details.

THPEA030	Improved Vector Modulator Card for MTCA-based LLRF Control System for Linear Accelerators	LLRF, controls, monitoring, radio-frequency	3207
	I. Rutkowski, K. Czuba, M. Grzegrzólka Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland D.R. Makowski, A. Mielczarek, P. Perek TUL-DMCS, Łódź, Poland H. Schlarb DESY, Hamburg, Germany
	Modern linear accelerators require high-precision RF field regulation of accelerating cavities. A critical component to achieve high-precision in the feedback loop a Low Level Radio Frequency (LLRF) controller is the vector modulator driving the high power RF chain. At FLASH, the Free Electron Laser in Hamburg and European XFEL the LLRF controls are based on MTCA.4 platform. This paper describes the concept, design and performance of an improved vector modulator module (DRTM-VM2). It is constructed as Rear Transition Module (RTM). The module consists of digital, analog, diagnostic and management subsystems. FPGA from Xilinx Spartan 6 family receives data from control module (AMC) using Multi-Gigabit Transceivers (MGTs). The FPGA controls the analog part which includes fast, high-precision DACs, I/Q modulator chips, programmable attenuators, power amplifier and fast RF gates for external interlock system. Pin assignment on the Zone3 connector is compliant with digital class D1.2 recommendations proposed by DESY. The design has been optimized for mass production and for easy extends to wider frequency range. Electronic switches offer software configuration of power and clock sources.

THPEA050	Power Supply Control and Applications Development for the TPS Storage Ring Quadrupole and Sextupole Magnet	controls, quadrupole, sextupole, EPICS	3258
	Y.-S. Cheng, J. Chen, P.C. Chiu, K.T. Hsu, C.Y. Liao, C.Y. Wu NSRRC, Hsinchu, Taiwan
	The TPS intermediate power supply for storage ring quadrupole and sextupole magnets with current rating 250 Amp will be equipped with Ethernet interface. The quadrupole power supply is 18bit with higher stability than sextupole with 16 bits, and have internal data buffer for post-mortem capability. The dedicated IOCs are built individually at the 24 cPCI platforms to manipulate the devices of the 24 cells of storage ring respectively. Each IOC is used to control 10 quadrupole magnet power supplies and 7 sextupole magnet power supplies. The GUIs of storage ring quadrupole and sextupole power supplies controls were implemented by the EDM toolkit. The client console can use the specific EDM pages to access power supplies via PVs channel access. The measured currents of quadrupole and sextupole power supplies were read back for observing performance. Some applications, like the degauss process, boot function and etc, are also developed with the specific toolkit. The efforts will be summarized at this report.

THPEA055	NESTOR Facility Control System	controls, storage-ring, monitoring, vacuum	3267
	D.V. Tarasov, V.N. Boriskin, I.M. Karnaukhov, D. Korzhov, V.N. Ljashchenko, A. Mytsykov, A.A. Shcherbakov, V.L. Skirda, V.I. Trotsenko, A.Y. Zelinsky NSC/KIPT, Kharkov, Ukraine
	The general principles of the NESTOR facility control system are presented in the paper. The main features of the systems such as magnetic, vacuum, diagnostic, Rf etc. concerning the control and monitoring are discussed. The first results of the system implementation are presented.

THPEA061	EPICS Accelerator Control System for the IAC-RadiaBeam THz Project	controls, EPICS, linac, HOM	3279
	A. Andrews, B.L. Berls, T. Downer, C.F. Eckman, K. Folkman, Y. Kim, C. O'Neill, J. Ralph IAC, Pocatello, IDAHO, USA P. Buaphad, Y. Kim ISU, Pocatello, Idaho, USA
	The Idaho Accelerator Center (IAC) of Idaho State University has been operating a 44 MeV L-band linac for various nuclear physics related applications. However, for the past several years, this research has been done without the aid of a modern computer based control system. To obtain a better reproducibility and stability in operation, the EPICS accelerator control system has been applied to control various components of this linac. This has been done for the purpose of a joint THz research project between IAC and RadiaBeam that was performed in November 2012. This paper describes the development of the EPICS accelerator control system used during this joint THz research experiment.

THPFI025	Design and Experimental Results of an Electro-static Pre-chopper for CSNS LEBT	rfq, radiation, simulation, cavity	3351
	H.C. Liu, S. Fu, K.Y. Gong, H.F. Ouyang, J. Peng IHEP, Beijing, People's Republic of China
	The China Spallation Neutron Source (CSNS) front end incorporates a pre-chopper in the Low Energy Beam Transport line (LEBT) that will remove a 530ns section of beam at approximately 1MHz rate, which is the RF frequency of the ring at injection. It’s one of the most critical devices for properly controlling the injecting beam loss. Physical designing of the pre-chopper is carried out, and the RFQ itself was used as the beam dump of the chopper system. In order to examine the reliability of the pre-chopper design, the beam study of a similar chopper system was successfully performed. Results of physical design and experiments will be presented.

THPFI066	Performance Enhancement of Electrical Power System at NSRRC	controls, radio-frequency, synchrotron, synchrotron-radiation	3448
	T.-S. Ueng, J.-C. Chang, Y.F. Chiu, K.C. Kuo, Y.-C. Lin NSRRC, Hsinchu, Taiwan
	A lot of efforts have been devoted to improve the reliability, the stability and the power quality of NSRRC electrical power system in recent years. These improvements include the power factor correction, solving nuisance tripping of air circuit breakers, replacing old-type capacitor banks, installing automatic voltage regulators and designing multi-source backup system with automatic transfer switch. All these improvement works are to ensure the reliable operation of NSRRC power system and reduce the electrical power accidents during the normal operation. Further, it can also provide the convenience for the electric power dispatching of NSRRC during the regular maintenance of power system.

THPFI071	Baking Tests and Results of A1050 Diamond Edge Gasket	vacuum, target, controls, ion	3463
	Y.T. Huang, C.-C. Chang, J.-R. Chen, G.-Y. Hsiung, S-N. Hsu, H.P. Hsueh NSRRC, Hsinchu, Taiwan J.-R. Chen National Tsing Hua University, Hsinchu, Taiwan
	A1050 is a common and soft material, widely used in everyday life. It is machinable and cheap, which makes it a candidate for a gasket material. In the case of sealing between disparate materials, treating the thermal expansion when the gasket suffers from baking is difficult. The clearance and the eccentricity between the gasket and the flange are also important; most leaks occur about 80 ~ 110 oC. The experimental apparatus comprised a vacuum chamber with six diamond-edge gaskets assembled, a turbo-molecular pump and an extractor gauge. The pre-baking torque for this gasket is 70 – 80 kg cm; the rates of both heating and cooling are less than 40 oC per hour. The gaskets are baked repeatedly under the same conditions excluding the target temperature set for baking. A1050 diamond gaskets work well after baking at 120 ~ 140 oC; at temperature 170 ~ 180 oC, leaks sometimes appear on cooling. This paper presents the baking results of A1050 diamond-edge gasket and explains the cause of leaking after baking above 150 oC.

THPWA022	An 800kV 30mA Line-Frequency Cockcroft-Walton Dc Generator Using Gas Insulated Transformer for Radiation Application	high-voltage, electron, impedance, radiation	3675
	Y.H. Liu, H.L. Guo, Z.-F. He, D.M. Li, M.X. Li, W.G. Shi, H.J. Su, S.L. Wang, Y.J. Yang, J.L. Zhang, Y.-T. Zhang SINAP, Shanghai, People's Republic of China
	The design and construction of a line-frequency 800 kV Cockcroft-Walton DC generator using gas insulated transformers are described, as well as the motive to develop it into radiation application. Several features are underlined, preliminary test results of the prototype presented and some problems encountered discussed.

THPWO031	Status of J-PARC Accelerators	linac, extraction, vacuum, injection	3830
	K. Hasegawa, M. Kinsho, H. Oguri JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan T. Koseki J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	After nine-months of beam shutdown by the Great Earthquake in March 2011, the J-PARC facility resumed beam operation. In December 2011, operations were carried out at low duty such as single-shots or 1 to 2.5 Hz for beam tuning. At the beginning of January 2012, we started beam tuning at the full repetition rate of 25 Hz at the linac and the 3 GeV Rapid Cycling Synchrotron (RCS). After the tuning, user programs of the Materials and Life Science Experiment Facility (MLF), the Neutrino facility and the Hadron facility started. The beam power was increased from 100 to 300 kW to the MLF users, from 3.3 kW to 6 kW to the Hadron users, and from 140 to 200 kW to the Neutrino users. The beam availability went lower to 73 % in JFY 2011 due to the trouble of the linac klystron power supply in March, but it has got back to 90-94 % as of November in JFY2012. We have also much upgrade work during the shutdown period or in parallel to the operation. We’ve demonstrated new record power beyond 500kW from the RCS. The status and progress of the J-PARC accelerators are presented.

THPWO032	Progress of Injection Energy Upgrade Project for J-PARC RCS	injection, impedance, septum, linac	3833
	N. Hayashi, H. Harada, K. Horino, H. Hotchi, J. Kamiya, M. Kinsho, P.K. Saha, Y. Shobuda, T. Takayanagi, N. Tani, T. Togashi, T. Ueno, M. Watanabe, Y. Watanabe, K. Yamamoto, M. Yamamoto, Y. Yamazaki, M. Yoshimoto JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan Y. Irie KEK, Ibaraki, Japan T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	The injection energy of the J-PARC RCS will be upgraded in 2013. New power supplies for the shift bump magnet system will be installed. Some of other systems, upgrade of the painting bump power supplies and pulse steering systems, are already installed and tested or used for the nominal operation. The paper reports the progress of injection energy upgrade project.

Paper

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MOPEA006

Operation and Performance Upgrade of the SOLEIL Storage Ring

feedback, vacuum, dipole, injection

73

A. Nadji, F. Bouvet, P. Brunelle, A. Buteau, L. Cassinari, M.-E. Couprie, N. Hubert, M. Labat, J.-F. Lamarre, P. Lebasque, A. Lestrade, A. Loulergue, P. Marchand, J.L. Marlats, L.S. Nadolski, R. Nagaoka, M.-A. Tordeux
SOLEIL, Gif-sur-Yvette, France

SOLEIL delivers photons to 26 beamlines and 3 new ones are under construction together with the femtoslicing project. Up to 5 filling patterns are available for the users including a low alpha mode; all of them are in Top-up injection. The beam current for the users has been increased to 430 mA in the multibunch mode. The Storage Ring (SR) is running with a new optics incorporating an additional quadrupole triplet in one long straight section. The beam position stability remains excellent. Vertical positions from the dipole X-BPMs have been included in the orbit feedbacks loop with very encouraging results. A feedback loop maintaining the emittance coupling close to 1% for any Insertion Devices (IDs) configuration has been implemented. Up to 25 very diverse IDs are now installed on the SR, and several others are under design or construction. In house developments are being carried out in several domains such as construction of SR dipole power supply spare and of 70 kW-500 MHz solid state amplifiers, design of a pulsed multipole magnet for injection, and a Robinson wiggler, as well as a feasibility study of a local reduction of the emittance in one of the long straight sections.

MOPEA064

A New Long Pulse High Voltage Extraction Power Supply for FETS

extraction, high-voltage, ion-source, ion

228

D.C. Faircloth, S.R. Lawrie, M. Perkins
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

A new 25 kV 2 ms 50 Hz extraction voltage power supply has been developed for the high performance H-minus ion source for the Front End Test Stand at the Rutherford Appleton Laboratory. The power supply has been designed to fit in a single 19 inch rack and has a modular design for easy maintenance. This paper details the design and performance of the power supply and extracted beam currents.

MOPWA002

New Purposed High Precision Power Supply For Quadrupole Magnets Of ILSF using Low Resolution Digital PWM

quadrupole, storage-ring, controls, feedback

664

M. Jafarzadeh, M. Akbari, J. Rahighi, D. Shirangi, E.H. Yousefi
ILSF, Tehran, Iran

A total number of 10⁴ quadrupole magnets, split into 9 families, will be required for the ISLF storage ring lattice. Each quadrupole magnet is connected with its own independent power supply. In new design for quadrupole magnets, the outputs of two synchronized push-pull converters (one for coarse regulation and another for fine current regulation) will be added together before a synchronous rectification. In this manner, there will be no need for extra high-current electronic parts. Another advantage of this design is using a high-voltage inductor on the switching side rather than a high current inductor ion the high current side. The PWM signal to control of buck converter (at the input stage of each unit) will be generated inside a dsPIC .

MOPWA003

New Development of Compact Fast Pulsed Power Supply System in the SPring-8

kicker, high-voltage, radiation, pulsed-power

666

C. Mitsuda, K. Fukami, K. Kobayashi, T. Nakanishi, H. Ohkuma, S. Sasaki
JASRI/SPring-8, Hyogo-ken, Japan
T. Ohshima
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan

We have developed a compact fast pulsed power supply system as a part of the development of the fast kicker magnet system in the SPring-8 storage ring. The kicker magnet is needed for the 1 ps short pulsed X-ray generation by a vertical kick and the suppression of the fast beam oscillation by counter kick. The required pulse width and current for above applications have to be a enough short time less than 4.8 us of the revolution time and more than 200 A respectively. We selected a Si-MOSFET as a switching device because a MOSFET has two capabilities of the fast switching and high-voltage resistance, and has a smaller size than an IGBT. The current are increased by parallel or parallel-series connecting of MOSFETs. We started the development of a test system whose output current was a 67 A with a pulse width of 1.0 us in 2008. From 2009 to 2011, we succeeded in achieving the output current of a 270 A with a pulse width of 0.8 us by using prototype system. In 2012, by increasing the number of MOSFET, we confirmed the output current of 250 A with a pulse width of 0.5 us, whose case size is a just 210(W) x 160(H) x 300(D) mm. We will report the development status in detail.

MOPWA004

Development of a Non-inductive Ceramic Resistor

kicker, injection, pulsed-power, impedance

669

T. Sugimoto, K. Fan, K. Ishii, H. Matsumoto
KEK, Ibaraki, Japan
K. Abe
Hitachi Haramachi Electronics Co. Ltd., Hitachishi, Ibaraki, Japan
S. Fukuoka
University of Tsukuba, Graduate School of Pure and Applied Sciences,, Tsukuba, Ibaraki, Japan

Non-inductive ceramic resistors, based on alumina and carbon, are used for impedance matching in the circuit of the J-PARC main ring injection kicker system. The kickers were installed in December 2011, and have been in operation successfully since then. However, discharges at the edge of the ceramic bulk were observed after several weeks’ operation, which increase resistance from O(100) to O(1M). Investigation indicates that poor contact with the rough surface of the ceramic bulk due to irregular shaped spots causes micro-gaps, which trigger the discharge. In order to improve the contact, one type of brazing technology has been experimentally applied to one resistor. Another resistor had an annealed thin copper plate inserted, and both resistors were tested and compared. In this paper, we will describe details of the development of the resistors and give future prospects.

MOPWA005

Development of a Feedback Control System for Resonant Power Supplies in the J-PARC 3-GeV Synchrotron

controls, feedback, impedance, quadrupole

672

Y. Watanabe
JAEA, Ibaraki-ken, Japan
N. Tani
JAEA/J-PARC, Tokai-mura, Japan

In the J-PARC 3-GeV Synchrotron, dipole magnets and seven families of quadrupole magnets are excited with a DC-biased 25 Hz sinusoidal waveforms using an individual resonant circuits. This paper proposed a feedback system to improve the amplitude and phase stability, specially against variation of capacitance caused by temperature characteristics in the resonant circuits. The control system has been successfully demonstrated and achieved amplitude and phase stability under ±0.005% and ±0.5 uS, respectively.

MOPWA006

Magnet Power Supply with Small Ripple using Sub-converter and Symmetrical Structure

controls, feedback, sextupole, extraction

675

S. Nakamura
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
S. Yamada
KEK, Tokai, Ibaraki, Japan

High precision tracking and small current ripple are necessary for a magnet power supply of a high power accelerator. A prototype power supply of the 100kW class is developed with an aim of small current ripple less than 10ppm, which employs a combination of main and sub-converter with symmetrical structure. The main converter unit supplies pattern current by a voltage feedforward control, while the sub-converters by a current feedback control. The symmetrical structure of the power supply is adopted to decouple normal mode and common mode ripples. Each converter unit is modularized and surrounded by a Faraday cage suppress for suppressing radiation of electrical noise and ease for maintenance. Its performance is studied using a set of 24 units of setupole magnets installed in J-PARC Main Ring.

MOPWA008

Power Supply of the Pulse Steering Magnet for Changing the Painting Area between the MLF and the MR at J-PARC 3 GeV RCS

injection, superconductivity, proton, controls

681

T. Takayanagi, N. Hayashi, K. Horino, M. Kinsho, T. Togashi, T. Ueno, Y. Watanabe
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
Y. Irie
KEK, Ibaraki, Japan

The power supply of the pulse steering magnet (PSTR) has been produced. The PSTR of the 3-GeV RCS (Rapid Cycling Synchrotron) in the J-PARC (Japan Proton Accelerator Research Complex) aims at changing the painting area in a pulse-to-pulse mode at 25Hz between the MLF (Material and Life science Experimental Facility) and the MR (50-GeV Main Ring synchrotron) at J-PARC. The power supply has the equipment used to excite the pulse current and the direct current (DC) to correspond to two modes that the paint injection for beam users and the central injection for beam commissioning. In case of the paint injection, the power supply excites the current from 40 A to 450 A in pulse mode, which has the capability to switch from positive to negative polarity. The pulse current has been performed with good accuracy whose deviation to a setting current becomes to be less than ± 0.2 %. In case of the central injection, the power supply excites the current from 1000 A to 3000A in DC mode, which has been realized output current deviation below ± 0.01 %. This paper summarizes the design parameters and the experimental results of the power supply.

MOPWA009

Development of a Fast Compensation Kicker System for J-PARC Main-ring Injection

kicker, injection, simulation, impedance

684

S. Fukuoka
University of Tsukuba, Graduate School of Pure and Applied Sciences,, Tsukuba, Ibaraki, Japan
K. Fan, K. Ishii, H. Matsumoto, T. Sugimoto
KEK, Ibaraki, Japan

Injection system of J-PARC main ring employs four lumped kickers to deflect the incoming beam. The residual field caused by tail and reflection of excitation current increases the closed beam orbit leading to particle loss in high power operation. A correction method using a fast kicker system to compensate the remaining angle is being developed. Doe to the narrow bunch spacing, transmission line kicker is selected to satisfy requirements of fast rise and fall time. The kicker magnet uses ceramic capacitors instead of parallel metal plates to make the magnet compact and reduce the stray inductance. Capacitors are installed in vacuum chamber. A very thin core is used to reduce distributed inductance. A bandwidth is calculated as 160 MHz. A Marx generator using FET switches has been studied, which is able to produce fast rise and fall time as 50 ns. Any pulse shape is generated by choosing switches to fire. A prototype magnet and a power supply have been fabricated for parameters test. In this paper, we will report the details of the system design, analyze the measurement results and give future prospects.

MOPWA014

Research and Design of Digital Power Supply for HIRFL-RIBLL Corrector Magnet

controls, feedback, secondary-beams, ion

690

Y.Z. Huang, Y.X. Chen, D.Q. Gao, J.B. Shangguan, R.K. Wang, H.H. Yan, Z.Z. Zhou
IMP, Lanzhou, People's Republic of China

One digital power supply was designed for RIBLL (Radioactive Ion Beam Line in Lanzhou) corrector magnet at HIRFL (Heavy Ion Research Facility in Lanzhou). Adopting two parallel connected IGBT full-bridges as the power circuit topology, the power supply can generate bipolar DC current when it runs in the fourquadrant working states, which well meets the requirements of corrector magnet. SOPC platform of Altera based on Nios II is chosen to design the digital power supply regulator. Employing FPGA as the control core and utilizing SOPC principles, the digital regulator is designed against special requirements of accelerator power supply. The test results indicate that performance of the power supply can meet the design requirements.

MOPWA015

The Control Strategy Research on Two Kinds of Topological Pulse Power Supply

controls, pulsed-power, heavy-ion, quadrupole

693

C.F. Shi, D.Q. Gao, Y.Z. Huang, H.H. Yan, Z.Z. Zhou
IMP, Lanzhou, People's Republic of China

This paper introduces a kind of pulsed power supply at HIRFL-CSR，analyzes the ripple and current error of the quadrupole magnet power supply in the operation process, and gives a two-stage topology of pulsed power supply. The control method is simulinked and the results show that the new one can make up for the deficiencies of the existing pulse power supply and the main circuit structure and control method are feasible.

MOPWA018

CW-type HV Power Supply of 50 Hz and its Application in Accelerator Power Supply

high-voltage, electron, impedance, damping

699

Z.-F. He, D.M. Li, Y.H. Liu, S.L. Wang, J.-L. Zhang, Y.-T. Zhang
SINAP, Shanghai, People's Republic of China

Funding: The Knowledge Innovation Program of Chinese Academy of Sciences
　　The high-voltage power supply is an integral part of accelerator technology, as its stable and reliable output is an important guarantee for accelerator properly working. In a number of engineering practice of accelerator design and construction, we tried to use the Cockcroft-Walton (CW) type of power supply driven by 50 Hz and got success. It is of simple structure, low cost, easy maintenance, and high efficiency. This report describes the technical difficulties and the solutions in the CW-type power supply driven by 50 Hz. It also gives an introduction of the latest design of 800 kV/30 mA electron accelerator, which is being assembled at SINAP. Recent work has shown that it is an option to choose 50 Hz driven power system when it is more lenient on the voltage ripple but needed to be as high as possible on the energy conversion efficiency.

MOPWA019

Digital Power Supply Controller Development Based on FPGA

controls, booster, synchrotron, synchrotron-radiation

702

R.N. Xu, C.L. Guo, D.M. Li, R. Li, S. Tan, W.F. Wu
SINAP, Shanghai, People's Republic of China

A digital power supply controller of SSRF (Shanghai Synchrotron Radiation Facility) adops advanced DSP, FPGA and precision ADC as core unit and data acquisition unit. The controller, which is embedded in the power supply case, is composed of two cards, DSP card and ADC card. The controller can communicate with IOC by optical fiber via the Ethernet, Manchester or RS-232 port. The parameters of adjusting power supply can be easily changed to achieve high stability and repeatability. The long-term stability is better than 20ppm. The resolution of current is better than 5ppm. As a replacement of imported PSI controller, the controller is mainly used in middle power supplies in SSRF, and it could accord with all the technical requirements of the facility.

MOPWA021

Design of the Air Cooling System for the High Voltage Power Supply of a Electron Accelerator

high-voltage, simulation, radiation, electron

705

F. Zhong, X. Lei, J. Yang, L. Yang
HUST, Wuhan, People's Republic of China

High voltage electron accelerators are widely applied in many fields of radiation pro-cessing,and the high voltage power supply is the critical equipment for the accelerator. for the requirement of high voltage, the design of locate the power supply in a steel barrel filled with SF6 is commonly used. Considering the various losses of the power supply, an air-cooling system is needed. This paper presents the design of the air-cooling system for the high voltage power supply. The fluid simulation of SF6 based on Fluent and the optimal design of the air duct's structure and the thermal efficiency have been done. The comparison and analysis of the simulation and the empirical formula result is also carried out. It illustrates the design of the air-cooling system can satisfy the demand of the heat radiation This paper also provides an effective method for the optimal design of the air duct's structure and the maximize efficiency of heat exchange.

MOPWA025

2Hz Ramping Mode Dipole Power Supply for Testing the NSLSII Booster Dipole Magnets

dipole, booster, controls, feedback

714

A.I. Erokhin, A.V. Bulatov, K. Gorchakov, S.M. Gurov, V.V. Kolmogorov, A.A. Kremnev, D.N. Pureskin, D.V. Senkov, R.V. Vakhrushev
BINP SB RAS, Novosibirsk, Russia

Budker Institute has designed and delivered Booster for NSLSII project including vacuum system, magnet system, diagnostics and power supplies. Dipole power supplies were directly delivered to BNL by sub-contractor (Danfysik, Denmark). To test dipole magnets on factory side, at BINP, it was decided to design and construct a high current ramping mode power supply. The designed power supply can operate with the reactive output power up to 150kVA and output current up to 900A at 2Hz ramping mode. The absolute accuracy achieved is better than 100ppm for the injection and extraction flats and better than 500ppm for the ramps.

MOPWA027

Pulse Power Supplies for Kicker Magnets of NSLS-2 Booster Ring

injection, kicker, extraction, booster

720

A.A. Korepanov, A. Akimov, A.A. Pachkov, A. Panov
BINP SB RAS, Novosibirsk, Russia

A set of identical ferrite kicker modules is utilized for the injection and extraction of the NSLS-2 booster ring. The pulse power supplies of these modules are based on the PFN-thyratron design. The pulse current amplitude of up to 4 kA at 300 ns flat top duration and PFN charging voltage of up to 23 kV were achieved on the extraction pulsers. The pulse to pulse repeatability of the output current waveform was measured and made up to 0.05% (σ) at nominal current for the extraction pulsers. The injection pulsers have a specification on the reverse current overshoot to be less than 0.5% of the amplitude. To fulfill this requirement a single turn saturated choke in the thyratron circuit was used. The design and the test results of the power supplies on NSLS-2 site are presented in the paper.

MOPWA040

Bipolar 10A and 50A Magnet Power Supplies for SwissFEL

controls, beam-losses, monitoring

756

R. Künzi, M. Emmenegger
PSI, Villigen PSI, Switzerland

15 years ago the Power Electronics Group at PSI, Switzerland developed power supplies (PS) for the magnets of the Swiss Light Source (SLS). These PS are based on switched mode converters with fully digital control. During the 12 years of operation of the SLS they have shown a very good reliability but also revealed some potential for improvement: After several years of operation the many fans installed started to fail more frequently and the same was observed for “off-the-shelf” AC/DC converters for the DC link. For the new SwissFEL, which shall be in service by 2016, approx. 610 PS rated at 10A and 40 PS rated at 50A will be necessary. As for any accelerator application high stability and reliability of the magnet PS are essential for high beam quality and availability. The development of the SwissFEL PS aims to raise the already good reliability by omitting as many fans as possible and adding redundancy for the AC/DC converters. Presently, a prototype rack with 21 10A PS is available and the mass production has started. The presented paper describes the PS concept and test results of the prototype regarding stability and efficiency are given.

MOPWA045

The Pulsed Power Supply System for TPS Project

injection, kicker, booster, storage-ring

771

C.-S. Fann, C.L. Chen, K.T. Hsu, S.Y. Hsu, A.P. Lee, K.-K. Lin, K.L. Tsai
NSRRC, Hsinchu, Taiwan

The pulsed power supply system for TPS project consists of three types of pulser for booster injection/extraction and storage ring injection. Categorizing by the delivered peak current, pulse shape base-width, they are for: 1) booster kicker: 500 A, square, 1 μs; 2) storage ring kicker: 5 kA, half-sine, 5 μs; 3) transfer line septum: 10 kA, half-sine, 300 μs; respectively. All together, there are 10 units constructed for the associated pulsed magnets. In this report, the test results of the pulsed power supplies will be summarized and the measured results of their performance are presented.

MOPWA046

The Multi-channel Measuring Data Acquisition Interface for TPS Quadrupole and Sextupole Magnet Power Supplies by using LabVIEW as the Developing Tool

quadrupole, sextupole, controls, LabView

774

B.S. Wang, Y.-C. Chien, C.-Y. Liu, K.-B. Liu
NSRRC, Hsinchu, Taiwan
H.P. Tsai
Chroma ATE Inc., Taiwan

This paper presents an implementation of a multi-channel measuring data acquisition interface of quadrupole and sextupole magnet power supplies (MPS) for Taiwan Photon source (TPS) withLabVIEW as the developing tool. The multi-channel measuring data acquisition interface could reduce quantity of measurement instrument and loading of operator at the MPS acceptance test. The instrument devices of measurement system include a multiplexer 、 a dynamic signal analyzer (DSA) and a multi-channel digital voltage meter (DVM), GPIB is the communication protocol betweenthe multi-channel measuring data acquisition interfaceand instruments. There are threeanalyzing procedure for the output currentof MPSin the default setting of the LabVIEW program, 1) Fast Fourier Transform of output current measured by DSA, 2) long-term stability of output current measured by DVM, 3) the linear error function fitting of output current by LabVEW toolbox;after these three analyzing procedureis completed, the performance of each MPS can be automatically generatedas a Microsoft Word report file.

MOPWA047

Development of a Digital Control Interface Card with a LabVIEW Control Program for TLS Corrector Magnet Power Supply

controls, LabView, feedback, monitoring

777

B.S. Wang, K.-B. Liu
NSRRC, Hsinchu, Taiwan

This paper presents an implementation of a virtual instrument control interface and a digitally controlled interface card for Taiwan Light Source (TLS) corrector magnet power supplies (MPS). Eight pieces of corrector MPS converter module are monitored and controlled by the digitally controlled interface card with delimit boundary of ±10 voltage. The digitally controlled interface card was implemented with an ADS1278 24-bits multi-channel analog-to-digital converter、a DAC8718 16-bits multi-channel digital-to-analog converter and the TMS320F28335 digital signal processor. There are two control modes of the virtual instrument control interface, which are 1) local control mode by RS-232, 2) the remote control by MiiNePort\_E1 TCP/IP protocol; with the developed Labview control interface the user can choose which mode to communicate with the corrector magnet power supplies depending on the working environment.

MOPWA048

The Cable Engineering Project for the TPS Power Supply

booster, storage-ring, dipole, sextupole

780

C.-Y. Liu, D.-G. Huang, K.-B. Liu, B.S. Wang
NSRRC, Hsinchu, Taiwan

The civil engineering of Taiwan Photon Source will soon be completed. The engineering of the power supply cabling should be done in advance of the schedule for the completion of the civil engineering. Using software (SolidWorks) to build a 3-D model, we obtain detailed cabling information because the model is made to scale 1 to 1. As all components are built into the model of the TPS accelerator, we can build accurately a model of the power supply cabling. For example, we can estimate every length and the total cable length for purchase and budget control. We can evaluate the conditions for every power cable to lay the cable tray from the power supply to the magnets, so we can lay every cable to follow the sequence in the cable tray. We thereby convert the drawing of the two-dimensional construction graph when we design the finished three-dimensional cabling model. The excellent and precise results are proved in this paper.

MOPWA067

Robust High-average-power Modulator

controls, klystron, neutron, pick-up

834

I. Roth, N. Butler, M.P.J. Gaudreau, M.K. Kempkes
Diversified Technologies, Inc., Bedford, Massachusetts, USA

Funding: US DOE. Grant No. DE-SC0004254
Diversified Technologies Inc. (DTI) designed a modulator which meets the requirements of the Spallation Neutron Source (SNS) modulators at Oak Ridge National Laboratory and will be less expensive than copies of the current modulators. The SNS modulators, under development for a decade, still do not meet the specifications for voltage, droop, or pulsewidth. The modulators must provide pulses of 85 kV, 165 A, with pulsewidths of 1.5 ms and voltage flatness of 1%. The current modulator switches the full power at high frequency during each pulse, and has a complex output transformer. DTI designed a modulator that meets all specifications and is less expensive. The proposed design is cheaper because there is an HV switch that operates at full current only once per pulse, a corrector that switches only 5% of the power at high frequency, a low-cost transformer-rectifier power supply, and no output transformer. DTI’s patented switch uses IGBTs, allowing the switch to operate at full capacity even if 20% of the devices fail. The modulator will be installed in 2013 at SNS to test klystrons. DTI will present the system components of the design as well as the performance results to date.

TUOCB202

Fast Orbit Feedback Scheme and Implementation for Taiwan Photon Source

feedback, simulation, controls, EPICS

1146

P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.Y. Wu
NSRRC, Hsinchu, Taiwan

TPS (Taiwan Photon Source) is a 3 GeV synchrotron light source which is being in construction at NSRRC. As most of 3rd generation light sources, 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, both of slow and fast correctors will be used for FOFB correction. In general, there are two schemes to operate these hybrid correctors. One is to transfer correction from fast to slow correctors periodically and avoid fast corrector saturation. The other is the fast correctors operated only at higher frequency domain and slow ones take care of DC part. TPS would adopt the first scheme but the second one still as a substitute. Both schemes will be supported. This report summarizes the infrastructure of the FOFB and the simulation is also presented.

Slides TUOCB202 [3.035 MB]

TUPEA012

Rebunching Ultracold Neutrons by Magnetic Deceleration for the neutron EDM experiment at J-PARC

neutron, resonance, coupling, focusing

1187

S. Imajo
Kyoto University, Kyoto, Japan
Y. Arimoto
KEK, Ibaraki, Japan
P.W. Geltenbort
ILL, Grenoble, France
Y. Iwashita
Kyoto ICR, Uji, Kyoto, Japan
M. Kitaguchi
Kyoto University, Research Reactor Institute, Osaka, Japan
Y. Seki
RIKEN Nishina Center, Wako, Japan
H.M. Shimizu
Nagoya University, Nagoya, Japan
T. Yoshioka
Kyushu University, Fukuoka, Japan

Ultra cold neutrons (UCN) - neutrons with energies less than 300 neV - can be accelerated or decelerated by means of static magnetic and RF fields. Neutron have a magnetic dipole moment, and hence their kinetic energies vary depending on their spin in magnetic fields. Their kinetic energies are restored when they get out from the magnetic field area if their spin did not flip. A spin flip can be triggered by applying an RF field whose frequency coincides with the spin precession frequency of a neutron in this magnetic field. This allows to tune the kinetic energy of neutrons. This method can be used to rebunch a pulsed beam of neutrons to a storage bottle that can store UCN. By open and close the storage bottle synchronously with the rebuncher, high UCN densities can be achieved for precision measurements of neutron properties such as the Electric Dipole Moment. The method and experimental setup are described in detail and the results of a recent first test experiments are presented.

TUPWO074

Reducing Spin Tune Spread by Matching DX Prime at Snakes in RHIC

quadrupole, simulation, proton, polarization

2030

C. Liu, M. Bai, E.D. Courant, A. Marusic, M.G. Minty, V.H. Ranjbar, S. Tepikian, R.A. Thomas, D. Trbojevic
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
At the Relativistic Heavy Ion Collider (RHIC) at BNL the physics program includes collisions between beams of polarized protons at high beam energies. Maintaining the proton's polarization is vital and preserved primarily by application of a pair of Siberian snakes. Measurements from recent high-energy physics runs indicate polarization loss during acceleration between 100 and 250 GeV. Based on analytic estimations for off-momentum particles and/or beams, a nonzero difference in DX prime - the dispersion function angle - between the snakes can result in a shift in the spin tune, or equivalently, of the conditions of snake resonances in close proximity to the beam during acceleration. Requiring that DX prime at the two Siberian snakes in RHIC being equal would reduce the spin tune shift for off-energy particles so helping to maintain polarization during the energy ramp. Preservation of half-integer spin tune is also important for future operation of the spin flipper at store. In this report, the matching scheme and simulations using MAD-X will be presented together with a newly applied method based on response matrices.

WEPWA032

The Feed-forward Control Design of Correction Coil Power Supply for SSRF EPU

controls, EPICS, undulator, insertion

2199

Q. Yuan, M. Gu, G.Y. Jiang, R. Wang
SINAP, Shanghai, People's Republic of China

The SSRF Elliptically Polarized Undulator (EPU) has been in operation for about three years. The feed-forward control algorithm of correction coil power supply (CCPS) is implemented in the Input and Output Controller (IOC) based on VME. The correction current responds not fast enough to gap movement, mainly because the communication between IOC and digital CCPS taking up much time. This paper introduces one new feed-forward design, that is ,on the one hand, the CCPS current responds to both gap movement and shift movement according to 2D Look-up Table(LUT) by linear interpolation method. On the other hand, feed-forward control algorithm is carried out in the EPU controller, and the CCPS with fast control response is directly controlled by PLC through analog interface. Thus, the correction current respond well to gap and shift movement owing to leaving out communication time.

WEPFI030

Design Studies on NSC KIPT Electron Gun System

gun, electron, high-voltage, cathode

2768

Z.S. Zhou, Y.L. Chi, D.Y. He
IHEP, Beijing, People's Republic of China

In NSC KIPT, a neutron source based on a subcritical assembly driven by a 100MeV/100kW electron linear accelerator is under design and development. The linear accelerator needs a new high current electron gun. In this paper, physical design, mechanical fabrication and beam test of this new electron gun are described. The emission current is designed to be higher than 2A for the pulse width of 3us with repetition rate of 50 Hz. The gun will operate with a DC high voltage power supply which can provide up to 150 kV high voltages. Computer simulations and optimizations have been carried out in the design stage, including the gun geometry and beam transport line. The test results of high voltage conditioning and beam test are presented. The operation status of the electron gun system is also included. The basic test results show that the design, manufacture and operation of the new electron system are basically successful.

WEPFI033

Development of the HLS 40kW Solid State Amplifier

rf-amplifier, storage-ring, damping, synchrotron

2777

L. Lin, G. Huang, C. Li, Y.T. Liu, W. Zhou
USTC/NSRL, Hefei, Anhui, People's Republic of China

A 40kW RF Solid State Amplifier (SSA) will replace the 25kW tetrode amplifier as the new RF power generator of HLS 800MeV electron storage ring. This SSA contains sixty-five 650W amplifier units (one unit drives sixty-four’s), with two-stage combination to reach the 40kW output. All of the components of SSA are prepared and tested, each of them meets the design requirements. The SSA has been assembled, and is in off-line testing now. The process of SSA’s design and manufacture, and the test results are presented in this paper.

WEPME033

Status of SSRF Fast Orbit Feedback System

feedback, EPICS, controls, synchrotron

2995

C.X. Yin, B.C. Jiang, L.Y. Zhao
SINAP, Shanghai, People's Republic of China

As a 3rd generation light source, Shanghai Synchrotron Radiation Facility (SSRF) is pushing the requirement of beam stability to sub-micron in the range of DC to 100Hz. A fast orbit feedback system was designed and implemented to satisfy this requirement. In this paper, the layout of SSRF fast orbit feedback system, the structure of its electronics system and its hardware and software subsystems are described. The current status of SSRF fast orbit feedback system is presented.

WEPME064

Recent Development on Beam-based Alignment in RHIC

quadrupole, alignment, controls, dipole

3082

J. Beebe-Wang, J.M. Ziegler
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
During the 2012 polarized proton and heavy ion runs, we continued the efforts on beam-based alignment (BBA) of quadrupoles in RHIC. A complete set of BBA data of triplet quadrupoles in all interaction regions of RHIC was obtained. In addition, the measurement procedures and data analysis were improved and the corresponding codes were developed. Here we report on the results of BBA measurements, analysis, and corrections. The model sensitivity, the measurement repeatability, and the BBA accuracy limitations are also discussed. As a continuing effort, we also present application code that is under development for future BBA operations in RHIC.

THPEA010

Design and Implementation of the Remote Control System of the Digital Magnet Power Supply of China Spallation Neutron Source

controls, EPICS, status, simulation

3167

X. Wu, Y.C. He, J. Liu, C.H. Wang, J.C. Wang
IHEP, Beijing, People's Republic of China

The magnet power supplies of the China Spallation Neutron Source (CSNS) can be classified into three types: rapid cycling synchrotron (RCS) resonant power supplies, fast response power supplies and DC power supplies. All of the magnet power supplies are controlled by the intelligent controller called Digital Power Supply Control Module (DPSCM), which can regulate the current and voltage circuit. The DPSCM is developed by the power supply group. It has two RS232 communication interfaces. All the command setting and reading power parameters are transmitted by Modbus protocol. Therefore, we made the communication protocol based on Modbus RTU between the remote control system and the DPSCM. This paper introduces the design of the remote control interface to the DPSCM. We developed EPICS IOC applications and real-time database on MOXA embedded serial device DA710 and OPIs using Control System Studio (CSS) according to different kinds of the power supplies. We have tested the remote control system with these kinds of power supplies. The test result shows that the remote control system is stable and reliable and it can basically meet the requirements of power supply system and physicists.

THPEA018

Design of an Integrated Platform based on CSS and MATLAB for SSC-LINAC System Controlling and Data Analysis

controls, EPICS, linac, vacuum

3182

M. Yue, S.Z. Gou, W. Zhang
IMP, Lanzhou, People's Republic of China

CSS is the abbreviation of Control System Studio and is widely used in particle accelerator experiments area. Based on Eclipse, it is a collection of tools which can display details of the PV, show alarm state, as well as the function of data browsers, archive engine and so on. CSS offers an integrated approach to build a control system. We have recently developed a control and monitor system for the SSC-LINAC system to control and monitor power supply, vacuum, high frequency, and other accelerator equipments. In the area of accelerator controlling, we often need to do some mathematical operations like Fourier transform of the monitored data to get some accuracy performances of interested equipments. Unfortunately, CSS cannot satisfy this requirement. It is well known that MATLAB plays very well in data process and provides many mathematical tools. If we can combine these two tools together, we can get better control strategy. In the presentation, we will discuss the design of this integrated platform to implement the display, control and data process.

THPEA020

The Design for Presetting Data Automatically in HIRFL Power Supply Control System

controls, LabView, heavy-ion, cyclotron

3187

X.J. Liu, Y. Chen, K. Gu, A. Shi, J.Q. Wu, F. Yang, W. Zhang
IMP, Lanzhou, People's Republic of China

This article introduces the structure of power supply in HIRFL(Heavy Ion Research Facility in Lanzhou) and designs a program which can preset power supply data automatically. We use Labview which is produced by NI Corporation to read Excel, access the Oracle database and send the generated instructions to power supply controllers. This program brings great convenience to physicists. It is used in SSC(Separated Sector Cyclotron) power supply system. The result shows that we can preset data quickly and accurately.

THPEA021

A Platform Control System for 320 kV HV Platform

controls, high-voltage, ion, LabView

3189

W. Zhang, K. Gu, J.Y. Li, X.J. Liu
IMP, Lanzhou, People's Republic of China

This article describes the platform control system applied to the Chinese Academy of 320KV HV platform for highly charged ions. This system is composed of the hardware and the software. The hardware is composed of the network controller based on ATmega128 core chip. Our control group has designed the network controller for controlling the different types of equipment on the platform. The control system achieves the reliability, stability control of the different types of equipment on the HV platform, and control of the network, improve operational efficiency. The software uses NI Corporation's LABVIEW to program user interface. We have established for the application modules of the network controller in the LABVIEW and realized the optimization of the network controller to configure and use. The platform control system has run three years in the 320KV HV platform.

THPEA022

The Remote Control System for LAPECR1

controls, ion, ion-source, high-voltage

3192

W.X. Zhou, F.Y. Lin, J.F. Luo, Y.Y. Wang, J. Yin, Y.J. Yu, D.T. Zhou
IMP, Lanzhou, People's Republic of China

In order to support the debug of LAPECR1(Lanzhou All Permanent Magnet ECR Ion Source No.1) which merely provides H⁺ beam for HIRFL(Heavy Ion Research Facility in Lanzhou), a control system was realized in November 2011. The control system is composed of some controllers, a control-software and Intranet which is established by a switch. All of the controllers can access to Intranet directly or through serial-switch. And the controllers of the HV power and motor were designed by us. A IPC(Industrial Personal Computer) could control all of the equipments through Intranet. For the software of the system, it is designed using C++. And it could show the important data in the form of spectrum for the purpose of analysis and debug. The control system can acquire data and send command from/to the corresponding equipment.

THPEA024

The Control System of the SDUV-FEL Test Facility

controls, FEL, EPICS, PLC

3195

J.G. Ding, S.M. Hu, G.Y. Jiang, H.F. Miao, H. Zhao, H.J. Zhu
SINAP, Shanghai, People's Republic of China

At SINAP, the Shanghai deep ultraviolet FEL test facility (SDUV FEL) was integrated to test the FEL key technologies and principles. The facility was constructed based on the existed SINAP 100MeV LINAC with modifications of cathode gun replacement and magnet compressor segment increment, extension of the undulator section, and the seeded laser system. The control system of the facility has been developed which upgraded and extended from the existed LINAC control system. The system was integrated based on the EPICS toolkit, consists of several subsystems of magnet power supply control, timing, vacuum monitor, RF control, undulator gap adjustment, and machine protection system. In this paper, the SDUV FEL control system is introduced. Solutions of equipment control, hardware and software implementations, and system integrations are described in details.

THPEA030

Improved Vector Modulator Card for MTCA-based LLRF Control System for Linear Accelerators

LLRF, controls, monitoring, radio-frequency

3207

I. Rutkowski, K. Czuba, M. Grzegrzólka
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
D.R. Makowski, A. Mielczarek, P. Perek
TUL-DMCS, Łódź, Poland
H. Schlarb
DESY, Hamburg, Germany

Modern linear accelerators require high-precision RF field regulation of accelerating cavities. A critical component to achieve high-precision in the feedback loop a Low Level Radio Frequency (LLRF) controller is the vector modulator driving the high power RF chain. At FLASH, the Free Electron Laser in Hamburg and European XFEL the LLRF controls are based on MTCA.4 platform. This paper describes the concept, design and performance of an improved vector modulator module (DRTM-VM2). It is constructed as Rear Transition Module (RTM). The module consists of digital, analog, diagnostic and management subsystems. FPGA from Xilinx Spartan 6 family receives data from control module (AMC) using Multi-Gigabit Transceivers (MGTs). The FPGA controls the analog part which includes fast, high-precision DACs, I/Q modulator chips, programmable attenuators, power amplifier and fast RF gates for external interlock system. Pin assignment on the Zone3 connector is compliant with digital class D1.2 recommendations proposed by DESY. The design has been optimized for mass production and for easy extends to wider frequency range. Electronic switches offer software configuration of power and clock sources.

THPEA050

Power Supply Control and Applications Development for the TPS Storage Ring Quadrupole and Sextupole Magnet

controls, quadrupole, sextupole, EPICS

3258

Y.-S. Cheng, J. Chen, P.C. Chiu, K.T. Hsu, C.Y. Liao, C.Y. Wu
NSRRC, Hsinchu, Taiwan

The TPS intermediate power supply for storage ring quadrupole and sextupole magnets with current rating 250 Amp will be equipped with Ethernet interface. The quadrupole power supply is 18bit with higher stability than sextupole with 16 bits, and have internal data buffer for post-mortem capability. The dedicated IOCs are built individually at the 24 cPCI platforms to manipulate the devices of the 24 cells of storage ring respectively. Each IOC is used to control 10 quadrupole magnet power supplies and 7 sextupole magnet power supplies. The GUIs of storage ring quadrupole and sextupole power supplies controls were implemented by the EDM toolkit. The client console can use the specific EDM pages to access power supplies via PVs channel access. The measured currents of quadrupole and sextupole power supplies were read back for observing performance. Some applications, like the degauss process, boot function and etc, are also developed with the specific toolkit. The efforts will be summarized at this report.

THPEA055

NESTOR Facility Control System

controls, storage-ring, monitoring, vacuum

3267

D.V. Tarasov, V.N. Boriskin, I.M. Karnaukhov, D. Korzhov, V.N. Ljashchenko, A. Mytsykov, A.A. Shcherbakov, V.L. Skirda, V.I. Trotsenko, A.Y. Zelinsky
NSC/KIPT, Kharkov, Ukraine

The general principles of the NESTOR facility control system are presented in the paper. The main features of the systems such as magnetic, vacuum, diagnostic, Rf etc. concerning the control and monitoring are discussed. The first results of the system implementation are presented.

THPEA061

EPICS Accelerator Control System for the IAC-RadiaBeam THz Project

controls, EPICS, linac, HOM

3279

A. Andrews, B.L. Berls, T. Downer, C.F. Eckman, K. Folkman, Y. Kim, C. O'Neill, J. Ralph
IAC, Pocatello, IDAHO, USA
P. Buaphad, Y. Kim
ISU, Pocatello, Idaho, USA

The Idaho Accelerator Center (IAC) of Idaho State University has been operating a 44 MeV L-band linac for various nuclear physics related applications. However, for the past several years, this research has been done without the aid of a modern computer based control system. To obtain a better reproducibility and stability in operation, the EPICS accelerator control system has been applied to control various components of this linac. This has been done for the purpose of a joint THz research project between IAC and RadiaBeam that was performed in November 2012. This paper describes the development of the EPICS accelerator control system used during this joint THz research experiment.

THPFI025

Design and Experimental Results of an Electro-static Pre-chopper for CSNS LEBT

rfq, radiation, simulation, cavity

3351

H.C. Liu, S. Fu, K.Y. Gong, H.F. Ouyang, J. Peng
IHEP, Beijing, People's Republic of China

The China Spallation Neutron Source (CSNS) front end incorporates a pre-chopper in the Low Energy Beam Transport line (LEBT) that will remove a 530ns section of beam at approximately 1MHz rate, which is the RF frequency of the ring at injection. It’s one of the most critical devices for properly controlling the injecting beam loss. Physical designing of the pre-chopper is carried out, and the RFQ itself was used as the beam dump of the chopper system. In order to examine the reliability of the pre-chopper design, the beam study of a similar chopper system was successfully performed. Results of physical design and experiments will be presented.

THPFI066

Performance Enhancement of Electrical Power System at NSRRC

controls, radio-frequency, synchrotron, synchrotron-radiation

3448

T.-S. Ueng, J.-C. Chang, Y.F. Chiu, K.C. Kuo, Y.-C. Lin
NSRRC, Hsinchu, Taiwan

A lot of efforts have been devoted to improve the reliability, the stability and the power quality of NSRRC electrical power system in recent years. These improvements include the power factor correction, solving nuisance tripping of air circuit breakers, replacing old-type capacitor banks, installing automatic voltage regulators and designing multi-source backup system with automatic transfer switch. All these improvement works are to ensure the reliable operation of NSRRC power system and reduce the electrical power accidents during the normal operation. Further, it can also provide the convenience for the electric power dispatching of NSRRC during the regular maintenance of power system.

THPFI071

Baking Tests and Results of A1050 Diamond Edge Gasket

vacuum, target, controls, ion

3463

Y.T. Huang, C.-C. Chang, J.-R. Chen, G.-Y. Hsiung, S-N. Hsu, H.P. Hsueh
NSRRC, Hsinchu, Taiwan
J.-R. Chen
National Tsing Hua University, Hsinchu, Taiwan

A1050 is a common and soft material, widely used in everyday life. It is machinable and cheap, which makes it a candidate for a gasket material. In the case of sealing between disparate materials, treating the thermal expansion when the gasket suffers from baking is difficult. The clearance and the eccentricity between the gasket and the flange are also important; most leaks occur about 80 ~ 110 oC. The experimental apparatus comprised a vacuum chamber with six diamond-edge gaskets assembled, a turbo-molecular pump and an extractor gauge. The pre-baking torque for this gasket is 70 – 80 kg cm; the rates of both heating and cooling are less than 40 oC per hour. The gaskets are baked repeatedly under the same conditions excluding the target temperature set for baking. A1050 diamond gaskets work well after baking at 120 ~ 140 oC; at temperature 170 ~ 180 oC, leaks sometimes appear on cooling. This paper presents the baking results of A1050 diamond-edge gasket and explains the cause of leaking after baking above 150 oC.

THPWA022

An 800kV 30mA Line-Frequency Cockcroft-Walton Dc Generator Using Gas Insulated Transformer for Radiation Application

high-voltage, electron, impedance, radiation

3675

Y.H. Liu, H.L. Guo, Z.-F. He, D.M. Li, M.X. Li, W.G. Shi, H.J. Su, S.L. Wang, Y.J. Yang, J.L. Zhang, Y.-T. Zhang
SINAP, Shanghai, People's Republic of China

The design and construction of a line-frequency 800 kV Cockcroft-Walton DC generator using gas insulated transformers are described, as well as the motive to develop it into radiation application. Several features are underlined, preliminary test results of the prototype presented and some problems encountered discussed.

THPWO031

Status of J-PARC Accelerators

linac, extraction, vacuum, injection

3830

K. Hasegawa, M. Kinsho, H. Oguri
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
T. Koseki
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

After nine-months of beam shutdown by the Great Earthquake in March 2011, the J-PARC facility resumed beam operation. In December 2011, operations were carried out at low duty such as single-shots or 1 to 2.5 Hz for beam tuning. At the beginning of January 2012, we started beam tuning at the full repetition rate of 25 Hz at the linac and the 3 GeV Rapid Cycling Synchrotron (RCS). After the tuning, user programs of the Materials and Life Science Experiment Facility (MLF), the Neutrino facility and the Hadron facility started. The beam power was increased from 100 to 300 kW to the MLF users, from 3.3 kW to 6 kW to the Hadron users, and from 140 to 200 kW to the Neutrino users. The beam availability went lower to 73 % in JFY 2011 due to the trouble of the linac klystron power supply in March, but it has got back to 90-94 % as of November in JFY2012. We have also much upgrade work during the shutdown period or in parallel to the operation. We’ve demonstrated new record power beyond 500kW from the RCS. The status and progress of the J-PARC accelerators are presented.

THPWO032

Progress of Injection Energy Upgrade Project for J-PARC RCS

injection, impedance, septum, linac

3833

N. Hayashi, H. Harada, K. Horino, H. Hotchi, J. Kamiya, M. Kinsho, P.K. Saha, Y. Shobuda, T. Takayanagi, N. Tani, T. Togashi, T. Ueno, M. Watanabe, Y. Watanabe, K. Yamamoto, M. Yamamoto, Y. Yamazaki, M. Yoshimoto
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
Y. Irie
KEK, Ibaraki, Japan
T. Toyama
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

The injection energy of the J-PARC RCS will be upgraded in 2013. New power supplies for the shift bump magnet system will be installed. Some of other systems, upgrade of the painting bump power supplies and pulse steering systems, are already installed and tested or used for the nominal operation. The paper reports the progress of injection energy upgrade project.