Achieving 800kW CW Beam Power and Continuing Energy Improvements in CEBAF

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During the past year, CEBAF at Jefferson Lab has demonstrated its full capacity of sustained 800 kW beam power. All systems performed as intended. The energy stability at the design parameters of 4.0 GeV, 200 muA CW beam was measured to be better than 3x10{sup -5} rms. During the fall of 1997, physics experiments were conducted using 4.4 GeV beam. Having demonstrated the benefits of in situ helium/rf processing of SRF cavities for increasing the energy reach of CEBAF, we began a program of processing all installed cryomodules. This processing has proven effective against the principal gradiation limitation of the ... continued below

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55 Kilobytes pages

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Reece, Charlie December 1, 1998.

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During the past year, CEBAF at Jefferson Lab has demonstrated its full capacity of sustained 800 kW beam power. All systems performed as intended. The energy stability at the design parameters of 4.0 GeV, 200 muA CW beam was measured to be better than 3x10{sup -5} rms. During the fall of 1997, physics experiments were conducted using 4.4 GeV beam. Having demonstrated the benefits of in situ helium/rf processing of SRF cavities for increasing the energy reach of CEBAF, we began a program of processing all installed cryomodules. This processing has proven effective against the principal gradiation limitation of the SRF cavities in CEBAF: discharges at the cold rf waveguide window, induced by electron field emission in the cavities. Such effects limit approximately half of the cavities. Regular operation at 5.0 GeV is just beginning, and preparations are underway to support 5.5 GeV in early 1999.

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55 Kilobytes pages

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  • 1998 Linear Accelerator Conference, Chicago, IL (US), 08/24/1998--08/28/1998

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  • Report No.: DOE/ER/40150-1245
  • Report No.: JLAB-ACO-98-03
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 754296
  • Archival Resource Key: ark:/67531/metadc710113

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  • December 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 5, 2016, 7:49 p.m.

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Reece, Charlie. Achieving 800kW CW Beam Power and Continuing Energy Improvements in CEBAF, article, December 1, 1998; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc710113/: accessed January 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.