A preliminary assessment of the electron cloud effect for the FNALmain injector upgrade [electronic resource].
- Published:
- Washington, D.C. : United States. Dept. of Energy, 2006.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Additional Creators:
- United States. Department of Energy
United States. Department of Energy. Office of Scientific and Technical Information - Access Online:
- www.osti.gov
- Summary:
- 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 δ{sub max} = 1.3, we find a threshold value of the bunch population, N{sub b,th} ≃ 1.25 x 10¹¹, beyond which the electron-cloud density ρ{sub e} reaches a steady-state level that is ≈10⁴ times larger than for N{sub b} < N{sub b,th}, essentially neutralizing the beam, and leading to a tune shift ≈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 ρ{sub e}. Possible dynamical effects from the electron cloud on the beam, such as emittance growth and instabilities, remain to be investigated separately.
- Note:
- Published through SciTech Connect.
06/14/2006.
"lbnl--57634-jart"
": KA1501020"
New Journal of Physics 8 FT
Furman, M.A.
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US) - Funding Information:
- DE-AC02-05CH11231
455301
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