Author: Hidaka, Y.
Paper Title Page
WEOBB01 Single Micron Single-Bunch Turn-by-Turn BPM Resolution Achieved at NSLS-II 2095
  • B. Podobedov, W.X. Cheng, K. Ha, Y. Hidaka, J. Mead, O. Singh, K. Vetter
    BNL, Upton, Long Island, New York, USA
  NSLS-II state-of-the-art BPMs provide a single micron turn-by-turn BPM resolution for any bunch train of reasonable intensity. For certain beam dynamics studies a similar, or even better, resolution is desired for a single-, or a few-bunch fill, which is not yet available with our standard BPM signal processing. This paper describes our experience with more advanced BPM ADC signal processing which allowed us to significantly improve turn-by-turn BPM resolution in single bunch mode down to the level of about one micron at ~1 nC/bunch. We also present the examples of machine studies that benefit from this BPM performance enhancement.  
slides icon Slides WEOBB01 [2.565 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEOBB01  
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THPMR008 Experimental Crosscheck of Algorithms for Magnet Lattice Correction 3400
  • V.V. Smaluk, W. Guo, Y. Hidaka, Y. Li, G.M. Wang, L. Yang, X. Yang
    BNL, Upton, Long Island, New York, USA
  Funding: Work supported by DOE contract DE-AC02-98CH10886
Performance, capabilities and limitations of various algorithms for linear magnet optics correction have been studied experimentally at NSLS-II. For the crosscheck, we have selected 4 algorithms based on turn-by-turn beam position analysis: weighted correction of betatron phase and amplitude, independent component analysis, model-independent analysis, and driving-terms-based linear optics characterization. A LOCO algorithm based on closed orbit measurement has been used as a reference. For the correction, either iterative solving of linear problem (matrix inversion with singular-value decomposition) or variational optimization has been used. For all the algorithms, accuracy limitations and convergence of linear lattice correction are discussed.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR008  
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