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} 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, ... continued below

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Furman, M.A. June 28, 2005.

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Description

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} 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, 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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  • Report No.: LBNL--57634
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/861024 | External Link
  • Office of Scientific & Technical Information Report Number: 861024
  • Archival Resource Key: ark:/67531/metadc780184

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  • June 28, 2005

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • April 1, 2016, 7:41 p.m.

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Furman, M.A. A preliminary assessment of the electron cloud effect for the FNALmain injector upgrade, report, June 28, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc780184/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.