Operation of CEBAF with heavy beamloading

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CEBAF is a 4 GeV, 200 {micro}A five-pass recirculating superconducting electron accelerator that has been operating for nuclear physics research at full energy since November 95. The beam current has been increased to over 180 {micro}A at 4 GeV with the maximum current in the linac over 900 {micro}A. The superconducting cavities operate in a regime where the beam-induced voltage is comparable to the accelerating gradient. The operational limits and the issues required to maintain stable operation of the 1,497 MHz superconducting cavities will be discussed, together with the implications for the other accelerator systems. There are three experimental Halls ... continued below

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516 KILOBYTES pages

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Hutton, A. July 1, 1997.

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CEBAF is a 4 GeV, 200 {micro}A five-pass recirculating superconducting electron accelerator that has been operating for nuclear physics research at full energy since November 95. The beam current has been increased to over 180 {micro}A at 4 GeV with the maximum current in the linac over 900 {micro}A. The superconducting cavities operate in a regime where the beam-induced voltage is comparable to the accelerating gradient. The operational limits and the issues required to maintain stable operation of the 1,497 MHz superconducting cavities will be discussed, together with the implications for the other accelerator systems. There are three experimental Halls which can run simultaneously with three interleaved 499 MHz bunch trains and RF separators. Operation with simultaneous beams to two Halls is now routine, and simultaneous three beam operation has been demonstrated. The maximum design current per bunch train (120 {micro}A) has been achieved. Hall B eventually requires beam currents as low as 1 nA (200 pA has been delivered) simultaneous with delivery of up to 200 {micro}A to the other Halls. The required beam current ratio of 10,000 has been achieved; development of 1 nA beam position monitors continues.

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516 KILOBYTES pages

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INIS; OSTI as DE97006864

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  • 17. IEEE particle accelerator conference, Vancouver, British Columbia (CA), 05/12/1997--05/16/1997; Other Information: Supercedes report DE97006864; PBD: 1 Jul 1997

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  • Other: DE97006864
  • Report No.: DOE/ER/40150--1152
  • Report No.: JLAB-ACO--97-05
  • Report No.: CONF-970503--160
  • Report No.: ON:DE97006864
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 505408
  • Archival Resource Key: ark:/67531/metadc696626

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  • July 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 5, 2016, 8:24 p.m.

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Hutton, A. Operation of CEBAF with heavy beamloading, article, July 1, 1997; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc696626/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.