Operation of the CEBAF Linac with High Beam Loading

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The superconducting RF, CW CEBAF accelerator will use a pair of antiparallel 400 MeV linacs connected by recirculation arcs for nominal 4 GeV in five passes. Single-pass, high power testing of the first linac has been conducted during the months preceding the conference. The RF control system [1] has been designed to control cavity gradient and phase under a wide range of gradients and significant beam loading. At full beam current, accelerating gradient is approximately equal to accelerating voltage in the superconducting RF cavities. Even though the beam current during the high power testing is one-fifth of the full current, ... continued below

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231 Kilobytes pages

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Merminga, L.; Bisognano, J.J.; Hovater, C.; Krafft, G.A.; Simrock, S.N. & Kubo, K. May 1, 1993.

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The superconducting RF, CW CEBAF accelerator will use a pair of antiparallel 400 MeV linacs connected by recirculation arcs for nominal 4 GeV in five passes. Single-pass, high power testing of the first linac has been conducted during the months preceding the conference. The RF control system [1] has been designed to control cavity gradient and phase under a wide range of gradients and significant beam loading. At full beam current, accelerating gradient is approximately equal to accelerating voltage in the superconducting RF cavities. Even though the beam current during the high power testing is one-fifth of the full current, beam loading is substantial. Operational experience of the response of the RF system is presented. A tuning algorithm which compensates for beam loading effects has been developed and tested. Heavy beam loading, corresponding to five-pass operation, was studied by increasing the loaded Q of the cavities. A current modulation experiment addressed the issue of energy spread increase due to current fluctuations, and the effect of by-passed cavities on beam properties was investigated.

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231 Kilobytes pages

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  • PAC 1993, Washington, DC (US), 05/17/1993--05/20/1993

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  • Report No.: CEBAF-PR-93-041
  • Report No.: DOE/ER/40150-1925
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 787854
  • Archival Resource Key: ark:/67531/metadc715962

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  • May 1, 1993

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  • Sept. 29, 2015, 5:31 a.m.

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  • Feb. 5, 2016, 8:24 p.m.

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Merminga, L.; Bisognano, J.J.; Hovater, C.; Krafft, G.A.; Simrock, S.N. & Kubo, K. Operation of the CEBAF Linac with High Beam Loading, article, May 1, 1993; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc715962/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.