Author: Della Penna, A.J.
Paper Title Page
TUPG38 A PPS Compliant Stored Beam Current Monitor at NSLS-II 426
  • A. Caracappa, C. Danneil, A.J. Della Penna, R.P. Fliller, D. Padrazo, O. Singh
    BNL, Upton, Long Island, New York, USA
  A requirement for top-off operations at the NSLS-II facility is at least 50mA stored ring current. The Stored Beam Current Monitor (SBCM) is part of the NSLS-II Personnel Protection System (PPS) that determines the storage ring current based on Pick-Up Electrode (PUE) readings. The SBCM selects the 500 MHz component of the PUE signal and downconverts it to about 2 MHz. The 2 MHz signal is rectified, averaged down to a bandwidth of 500 Hz, and compared to a threshold voltage equivalent to 55mA of stored beam. A redundant SBCM system was also constructed and these two systems must agree that the stored beam is above the threshold to enable top-off operations. The SBCM is also required to remain accurate over wide range of possible bunch patterns and bunch intensity distributions. Under normal conditions for top-off operations the SBCM measurement accuracy is about 1%. The SBCM was commissioned in 2015 as part of the Top-Off Safety System (TOSS) which is responsible for ensuring safe top-off operations at NSLS-II.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG38  
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