RF Control System for CEBAF

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The design goal of 2.5*10^-5 rms energy spread for the CEBAF electron beam demands strict control of the phase and amplitude of the 1.5 GHz accelerating field.To achieve such control in the presence of microphonic excitations, a separate system for each of the 338 superconducting cavities is required.The RF control system employs a heterodyne scheme which allows the use of high precision analog circuits operating at 70 MHz.Presently, the 45 MeV CEBAF injector with 18 superconducting cavities is being commissioned, and this effort provides the first full integrated test in the accelerator tunnel, including cryogenics, RF, beam transport, and beam ... continued below

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Simrock, Stefan May 1, 1991.

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The design goal of 2.5*10^-5 rms energy spread for the CEBAF electron beam demands strict control of the phase and amplitude of the 1.5 GHz accelerating field.To achieve such control in the presence of microphonic excitations, a separate system for each of the 338 superconducting cavities is required.The RF control system employs a heterodyne scheme which allows the use of high precision analog circuits operating at 70 MHz.Presently, the 45 MeV CEBAF injector with 18 superconducting cavities is being commissioned, and this effort provides the first full integrated test in the accelerator tunnel, including cryogenics, RF, beam transport, and beam diagnostics.The RF control system design and objectives are discussed and compared to measured performance during the first commissioning phase.Hardware reliability and operational challenges experienced for RF control are presented.

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  • Invited Talk compiled for Particle Accelerator Conference, San Francisco, Calif., May 6-9, 1991. (PAC 91)

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  • Report No.: CEBAF-PR-91-21
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 954215
  • Archival Resource Key: ark:/67531/metadc934292

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  • May 1, 1991

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 9, 2016, 8:23 p.m.

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Simrock, Stefan. RF Control System for CEBAF, article, May 1, 1991; [Newport News, Virginia]. (digital.library.unt.edu/ark:/67531/metadc934292/: accessed May 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.