Feedback Systems and Beam Stability
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TUAO05
 System Identification and Stability Considerations for Closed Orbit Feedback at SIS-18  
 
  • R. Singh, S.H. Mirza
    GSI, Darmstadt, Germany
  
  A new fast feedback system designed for fast ramping synchrotron SIS-18 at GSI. First controlled tests with beam were performed in the previous engineering run beam-time. The system was tested for robustness by operation under mismatched spatial model for several controller settings. This contribution discusses the open and closed loop system identification efforts as well as the first experiences with respect to the stability limits of this COFB system.  
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WEPP17 Upgrade and First Commissioning of Transverse Feedback System for SSRF 136
 
  • N. Zhang, B. Gao, L.W. Lai, R.X. Yuan
    SSRF, Shanghai, People’s Republic of China
  
  To be a part of the transverse feedback system upgrade plan in SSRF PHASE II project, a set of Dimtel feedback processors was installed to replace the previous set. In the commissioning, the ability of supressing the trans-verse oscillation was tested and evaluated, also, beam diagnostics and control tools of the processors was used for injection transients analysis, tune tracking and bunch cleaning. The results of the commissioning and data analysis will be presented in this paper.  
poster icon Poster WEPP17 [2.188 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2020-WEPP17  
About • paper received ※ 24 August 2020       paper accepted ※ 15 September 2020       issue date ※ 30 October 2020  
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WEPP18
 Stochastic Cooling Pickup/Kicker Developments for a High-Precision Spectrometer Ring  
 
  • G. Zhu, Z. Du, Y. Wei, J.X. Wu
    IMP/CAS, Lanzhou, People’s Republic of China
  • F. Caspers
    CERN, Geneva, Switzerland
  
  Stochastic cooling of the Spectrometer Ring (SRing) at the High Intensity heavy-ion Accelerator Facility (HIAF) project in China, which is used mainly for experiments with radioactive fragment beams, is applied to speed up the cooling process of a stored ion beam. In this study, both a Faltin traveling wave structure and a novel slot-ring standing wave structure based on a ceramic vacuum chamber are discussed and evaluated for the pickup/kicker of the SRing stochastic cooling system. The slot-ring structure should significantly improve the shunt impedance due to the Cerenkov effect. For the Faltin-type structure, the results for the pickup shunt impedance obtained from simulations and from beam measurements agree well. Good agreement is also found between the simulated and measured results for the pickup shunt impedance of the slot-ring structure. Cooling process simulations using the Fokker-Planck equation based on the shunt impedance results for the Faltin and slot-ring type pickups are also presented.  
poster icon Poster WEPP18 [5.816 MB]  
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THPP15
 Upgrade and Operational Status of Transverse Feedback System at the Canadian Light Source  
 
  • T. Batten
    CLS, Saskatoon, Saskatchewan, Canada
  
  The Canadian Light Source (CLS) is third-generation Synchrotron with 24 operational beamlines. Instabilities in the storage ring significantly impact both machine and beamline experiments. To improve stability and provide additional diagnostic tools the Transverse Feedback System (TFBS) was upgraded to incorporate Dimtel equipment in October 2019. This system is currently being used to actively damp the transverse betatron oscillations associated with coupled bunch instabilities, for bunch cleaning and for continuous tune measurements using the notch method. This new system has also allowed the facility to move forward with a tune feedback system that is currently being commissioned. The tune feedback system will allow us to stabilize the tune when components in the Storage ring are moving or changing. The Dimtel hardware supports the ability to accurately measure the growth and damping rates for various beam instabilities. In the future we intend to use this system to evaluate the modal instabilities inherent in our machine. This will ultimately allow us to more accurately characterize our machine and provide a more stable light source to our users.  
poster icon Poster THPP15 [0.321 MB]  
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THPP16 Septum Orbit Feedforward Correction at the AS 237
 
  • C.N. Lehmann
    University of Queensland, Brisbane, Queensland, Australia
  • M.P. Atkinson, Y.E. Tan
    AS - ANSTO, Clayton, Australia
  
  The leakage fields generated by the septum in the injection straight perturbs the beam by as much as 130 µm horizontally and 80 µm vertically during injection. Passive shielding with copper collars and Mu metal sheets has reduced the perturbation but not removed them. The remainder of the perturbation will be corrected using an active feedforward system. This report will discuss the design of the system and the effectiveness of the prototype.  
poster icon Poster THPP16 [0.614 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2020-THPP16  
About • paper received ※ 03 September 2020       paper accepted ※ 14 September 2020       issue date ※ 30 October 2020  
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