Keyword: power-supply
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MOPG06 First Beam Tests of the APS MBA Upgrade Orbit Feedback Controller feedback, hardware, controls, storage-ring 39
 
  • N. Sereno, N.D. Arnold, A.R. Brill, H. Bui, J. Carwardine, G. Decker, B. Deriy, L. Emery, R.I. Farnsworth, T. Fors, R.T. Keane, F. Lenkszus, R.M. Lill, D.R. Paskvan, A.F. Pietryla, H. Shang, S.E. Shoaf, S. Veseli, J. Wang, S. Xu, B.X. Yang
    ANL, Argonne, Illinois, USA
  
  Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357
The new orbit feedback system required for the APS multi-bend acromat (MBA) ring must meet challenging beam stability requirements. The AC stability requirement is to correct rms beam motion to 10 \% the rms beam size at the insertion device source points from 0.01 to 1000 Hz. The vertical plane represents the biggest challenge for AC stability which is required to be 400 nm rms for a 4 micron vertical beam size. In addition long term drift over a period of 7 days is required to be 1 micron or less at insertion device BPMs and 2 microns for arc bpms. We present test results of the MBA prototype orbit feedback controller (FBC) in the APS storage ring. In this test, four insertion device BPMs were configured to send data to the FBC for processing into four fast corrector setpoints. The configuration of four bpms and four fast correctors creates a 4-bump and the configuration of fast correctors is similar to what will be implemented in the MBA ring. We report on performance benefits of increasing the sampling rate by a factor of 15 to 22.6 kHz over the existing APS orbit feedback system, limitations due to existing storage ring hardware and MBA orbit feedback design. 		 
poster icon Poster MOPG06 [6.490 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG06  
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MOPG11 Beam Commissioning of TPS Fast Orbit Feedback System feedback, interface, booster, EPICS 59
 
  • P.C. Chiu, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.H. Huang
    NSRRC, Hsinchu, Taiwan
  
  Submicron orbit stability for a low emittance synchrotron light source are essential. Besides locating and removing the existing perturbations, active orbit feedback is applied to improve the orbit stability below sub-micron range from DC to a few hundreds of Hertz. Efforts to investigate orbit stability and stabilization at TPS will be addressed in this report.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG11  
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MOPG49 A Precise Pulsed Current Source for Absolute Calibration of Current Measurement Systems With No DC Response operation, impedance, hardware, instrumentation 165
 
  • M. Krupa, M. Gąsior
    CERN, Geneva, Switzerland
  • M. Krupa
    TUL-DMCS, Łódź, Poland
  
  Absolute calibration of systems with no DC response requires pulsed calibration circuits. This paper presents a precise pulsed current source designed primarily for remote calibration of a beam intensity measurement system. However, due to its simple and flexible design, it might also prove interesting for other applications. The circuit was designed to drive a load of 10 Ω with current pulses lasting a few hundred microseconds with an amplitude of 1 A and precision in the order of 0.01%. The circuit is equipped with a half-bridge for precise determination of the absolute output current using the 0 V method. This paper presents the circuit topology and discusses in detail the choice of the critical components along with their influence on the final achieved accuracy. The performance of the built prototype of the current source is presented with laboratory measurements.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG49  
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WEPG06 Orbit Feedforward and Feedback Applications in the Taiwan Light Source feedback, operation, controls, insertion 623
 
  • C.H. Kuo, P.C. Chiu, K.T. Hsu, K.H. Hu
    NSRRC, Hsinchu, Taiwan
  
  Taiwan Light Source (TLS) is a 1.5 GeV third-generation light source with circumference 120 meters. TLS is operated at 360 mA top-up injection mode. The storage ring is 6-fold symmetry with 6-meter straight sections for injection, RF cavity, and insertion devices. There are three undulators were installed in three straight sections to delivery VUV and soft X-ray for users. Beside there undulators, a conventional wiggler (W200 installed at straight sections to provide hard X-ray to serve user. Working parameters of hard X-ray sources are fixed without cause problem on operation. However, undulators should be changing its working parameters during user experiments performed. These undulator during its gap/phase changing will create orbit perturbation due to its field errors. Orbit feedback is main tool to keep orbit without change. However, some correctors setting of the orbit feedback system are easy to saturation due to large perturbation come from U90. To keep functionality of the orbit feedback system working in good condition, combines with orbit feedback and feed-forward is proposed and reported in this conference.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG06  
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