Author: Fliller, R.P.
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WEPOW058 Top-off Tests and Controls Optimization 2982
 
  • G.M. Wang, M.A. Davidsaver, A.A. Derbenev, R.P. Fliller, Y. Hu, T.V. Shaftan
    BNL, Upton, Long Island, New York, USA
 
  Funding: DOE No.DE-AC02- 98CH10886
The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source at Brookhaven National Laboratory. As in many other light sources, top-off injection is considered as a standard operation mode resulting in more stable beam intensity to minimize heat load variation on the beamline optics. Top off injection specifications include maintaining the stored beam current within 0.5% and the bunch to bunch charge variation within 20% bands. To make the top off commissioning smooth and efficient, a virtual machine model based on the measured beam properties was developed. The model helped to study robustness of this application operating under different conditions and optimize the input parameters. Once tested the model was transitioned to beam commissioning. To make the beam tests more efficient, the beam lifetime was controlled by adjusting RF voltage and scrapers. In this paper, we'll share the experience from the test stage to machine implementation of the top-off controls.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW058  
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WEPOW059 The NSLS-II Top Off Safety System 2985
 
  • R.P. Fliller, D. Bergman, A. Caracappa, L. Doom, G. Ganetis, Y. Hu, Y. Li, W. Louie, D. Padrazo, O. Singh, J. Tagger, G.M. Wang, Z. Xia
    BNL, Upton, Long Island, New York, USA
 
  Funding: This manuscript has been authored by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
Top Off operation is the desired mode of operation for 3rd generation light sources to ensure beam current stability for user experiments. However, top off operation introduces the hazard of injecting electrons into the front ends with the beamline shutters open. This hazard can be mitigated with the appropriate safety system. This past year, the NSLS-II has transitioned from decay mode to top off operation with the introduction of the Top Off Safety System (TOSS). Top Off was initially demonstrated September 22, 2015 and become standard mode of operating. In this paper we discuss the top off safety system, operation with the system, and future directions.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW059  
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WEPOW060 Top Off Algorithm Development and Commissioning at NSLS-II 2988
 
  • R.P. Fliller, A.A. Derbenev, T.V. Shaftan, G.M. Wang
    BNL, Upton, Long Island, New York, USA
 
  Funding: This manuscript has been authored by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
Recently, NSLS-II introduced top off as the standard mode of beam delivery for the users. During top off, we are required to maintain the beam current within ±0.5% of nominal, and the bunch to bunch variation over the train less than 20% for all operating conditions. In this paper, we discuss the algorithm used for top off, simulations of various operating conditions and performance of the algorithm during operations.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW060  
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