A preliminary assessment of the electron cloud effect for the FNALmain injector upgrade

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We present results from a preliminary assessment, via computer simulations, of the electron-cloud density for the FNAL Main Injector upgrade at injection energy. Assuming a peak value for secondary emission yield {delta}{sub max} = 1.3, we find a threshold value of the bunch population, N{sub b,th} {approx_equal} 1.25 x 10{sup 11}, beyond which the electron-cloud density {rho}{sub e} reaches a steady-state level that is {approx}10{sup 4} times larger than for N{sub b} < N{sub b,th}, essentially neutralizing the beam, and leading to a tune shift {approx}0.05. Our investigation is limited to a field-free region and to a dipole magnet region, ... continued below

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Furman, M.A. June 14, 2006.

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We present results from a preliminary assessment, via computer simulations, of the electron-cloud density for the FNAL Main Injector upgrade at injection energy. Assuming a peak value for secondary emission yield {delta}{sub max} = 1.3, we find a threshold value of the bunch population, N{sub b,th} {approx_equal} 1.25 x 10{sup 11}, beyond which the electron-cloud density {rho}{sub e} reaches a steady-state level that is {approx}10{sup 4} times larger than for N{sub b} < N{sub b,th}, essentially neutralizing the beam, and leading to a tune shift {approx}0.05. Our investigation is limited to a field-free region and to a dipole magnet region, both of which yield similar results for both N{sub b,th} and the steady-state value of {rho}{sub e}. Possible dynamical effects from the electron cloud on the beam, such as emittance growth and instabilities, remain to be investigated separately.

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  • Journal Name: New Journal of Physics; Journal Volume: 8; Related Information: Journal Publication Date: 2006

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  • Report No.: LBNL--57634-JArt
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1088/1367-2630/8/11/279 | External Link
  • Office of Scientific & Technical Information Report Number: 900701
  • Archival Resource Key: ark:/67531/metadc877079

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  • June 14, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 21, 2017, 7:11 p.m.

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Furman, M.A. A preliminary assessment of the electron cloud effect for the FNALmain injector upgrade, article, June 14, 2006; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc877079/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.