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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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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  • 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 October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.