Ion bombardment in RF photoguns

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A linac-ring eRHIC design requires a high-intensity CW source of polarized electrons. An SRF gun is viable option that can deliver the required beam. Numerical simulations presented elsewhere have shown that ion bombardment can occur in an RF gun, possibly limiting lifetime of a NEA GaAs cathode. In this paper, we analytically solve the equations of motion of ions in an RF gun using the ponderomotive potential of the Rf field. We apply the method to the BNL 1/2-cell SRF photogun and demonstrate that a significant portion of ions produced in the gun can reach the cathode if no special ... continued below

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Pozdeyev,E.; Kayran, D. & Litvinenko, V. N. May 4, 2009.

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A linac-ring eRHIC design requires a high-intensity CW source of polarized electrons. An SRF gun is viable option that can deliver the required beam. Numerical simulations presented elsewhere have shown that ion bombardment can occur in an RF gun, possibly limiting lifetime of a NEA GaAs cathode. In this paper, we analytically solve the equations of motion of ions in an RF gun using the ponderomotive potential of the Rf field. We apply the method to the BNL 1/2-cell SRF photogun and demonstrate that a significant portion of ions produced in the gun can reach the cathode if no special precautions are taken. Also, the paper discusses possible mitigation techniques that can reduce the rate of ion bombardment.

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  • Particle Accelerator Conference (PAC09); Vancouver, B.C., Canada; 20090504 through 20090508

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  • Report No.: BNL--81847-2009-CP
  • Grant Number: DE-AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 962183
  • Archival Resource Key: ark:/67531/metadc926961

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Office of Scientific & Technical Information Technical Reports

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  • May 4, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 8:35 p.m.

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Pozdeyev,E.; Kayran, D. & Litvinenko, V. N. Ion bombardment in RF photoguns, article, May 4, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc926961/: accessed May 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.