The optimization of a DC injector for the Energy Recovery Linac upgrade to APS

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An energy recovery linac based light source is a potential revolutionary upgrade to the Advanced Photon Source (APS) at Argonne National Laboratory. The concept relies on several key research areas, one of which is the generation of ultra-low emittance, high-average-current electron beams. In this paper, we present our investigation of a dc-gun-based system for ultra-low emittance bunches in the 20 pC range. A parallel multi-objective numerical optimization is performed in multi-parameter space. Parameters varied include experimentally feasible drive-laser shapes, the DC gun voltage, the thermal energy of the emitted photo-electrons and other electric or magnetic field strengths, RF cavity phase ... continued below

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3 pages

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Sun, Yin-e; Shang, Hairong; Borland, Michael; Li, Yuelin & Harkay, Katherine October 1, 2008.

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An energy recovery linac based light source is a potential revolutionary upgrade to the Advanced Photon Source (APS) at Argonne National Laboratory. The concept relies on several key research areas, one of which is the generation of ultra-low emittance, high-average-current electron beams. In this paper, we present our investigation of a dc-gun-based system for ultra-low emittance bunches in the 20 pC range. A parallel multi-objective numerical optimization is performed in multi-parameter space. Parameters varied include experimentally feasible drive-laser shapes, the DC gun voltage, the thermal energy of the emitted photo-electrons and other electric or magnetic field strengths, RF cavity phase etc. Our goal is to deliver a {approx}10 MeV, 20 pC bunch at the entrance of the linac with an emittance of 0.1 {micro}m or lower, rms bunch length of 2 {approx} 3 ps, and energy spread no larger than 140 keV. We present the machine parameters needed to generate such an injector beam, albeit without a merger.

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3 pages

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  • Report No.: FERMILAB-CONF-08-386-APC
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 970057
  • Archival Resource Key: ark:/67531/metadc932460

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  • October 1, 2008

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  • Nov. 13, 2016, 7:26 p.m.

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  • July 25, 2017, 1:36 p.m.

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Sun, Yin-e; Shang, Hairong; Borland, Michael; Li, Yuelin & Harkay, Katherine. The optimization of a DC injector for the Energy Recovery Linac upgrade to APS, article, October 1, 2008; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc932460/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.