Compensation of RF-Induced Energy Spread in the CEBAF Injector Chopping System

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The CEBAF injector chopping system must generate three interleaved 499 MHz pulse trains of independently variable current from a DC input beam prior to axial compression. The chopper consists of two deflection cavities with an aperture midway between them. Lenses flanking the aperture focus the beam from the first cavity into the center of the second, where the RF deflection from the first cavity is removed. The symmetry of the RF energy spread across any time-slice of the beam is dominantly odd. The inverting optics used to focus the beam into the second cavity causes near cancellation of the energy ... continued below

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231 Kilobytes pages

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Tiefenback, M.G. & Krafft, G.A. May 1, 1993.

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The CEBAF injector chopping system must generate three interleaved 499 MHz pulse trains of independently variable current from a DC input beam prior to axial compression. The chopper consists of two deflection cavities with an aperture midway between them. Lenses flanking the aperture focus the beam from the first cavity into the center of the second, where the RF deflection from the first cavity is removed. The symmetry of the RF energy spread across any time-slice of the beam is dominantly odd. The inverting optics used to focus the beam into the second cavity causes near cancellation of the energy spread from the two cavities. We present experimental measurements of the energy spread effects from a fundamental frequency (1497 MHz) chopper prototype producing a beam of suitable transverse emittance and energy spread, and discuss the expected performance of the subharmonic chopper system to be used for commissioning starting in January 1994.

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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-93-047
  • Report No.: DOE/ER/40150-1931
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 787860
  • Archival Resource Key: ark:/67531/metadc716918

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 1, 1993

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 29, 2016, 4:19 p.m.

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Tiefenback, M.G. & Krafft, G.A. Compensation of RF-Induced Energy Spread in the CEBAF Injector Chopping System, article, May 1, 1993; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc716918/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.