Author: Sadowski, J.T.
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TUYD2
Progress Towards Long-Lifetime, High-Current Polarized-Electron Sources  
 
  • J.P. Biswas
    Stony Brook University, Stony Brook, USA
  • J.P. Biswas, M. Gaowei, W. Liu, O.H. Rahman, J.T. Sadowski, X. Tong, E. Wang
    BNL, Upton, New York, USA
 
  Funding: The work was supported by the U.S. Department of Energy under Contract No. DE-AC02-98CH10886
We describe new activation techniques, developed using Cs-Te and Cs-O-Te as a activation layers, to achieve Negative Electron Affinity (NEA) surfaces of GaAs. X-Ray photoelectron spectroscopic and Low Energy Electron Microscopic studies have been performed on these surfaces. The results indicate that both layers achieve NEA of GaAs and lead to longer charge lifetime compared to traditional Cs-O/GaAs photocathodes.
 
slides icon Slides TUYD2 [10.825 MB]  
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WEPA81 Time-Resolved Experiments at NSLS II: Motivation and Machine Capabilities 826
 
  • G.M. Wang, B. Bacha, G. Bassi, G.L. Carr, Y. Hidaka, Y. Hu, Y. Li, C. Mazzoli, D. Padrazo Jr, R.S. Rainer, J. Rose, J.T. Sadowski, V.V. Smaluk, Y. Tian, L. Wiegart, G. Williams, X. Yang
    BNL, Upton, New York, USA
 
  NSLS-II is a 3-GeV third-generation synchrotron light source at Brookhaven National Lab. The storage ring has been in routine operations for over six years and hosts 28 operating beamlines. The storage ring performance has continuously improved, including 500-mA with limited insertion devices closed, and routine 400-mA top off operation with 90% uniform filling pattern. Recently, we are exploring different operation modes, uniform multi single-bunch mode, and camshaft mode with a high single-bunch charge, to support timing-resolved user experiments. In this paper, we explore the potential for scientific experiments using the pulsed nature of the NSLS, summarize the user requirements on the beam parameters and the progress of accelerator studies.  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEPA81  
About • Received ※ 04 August 2022 — Revised ※ 12 August 2022 — Accepted ※ 13 August 2022 — Issue date ※ 22 August 2022
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