Screening of the resistive-wall impedance by a cylindrical electron plasma

Details Screening of the resistive-wall impedance by a cylindrical electron plasma Screening of the resistive-wall impedance by a cylindrical electron plasma

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008njph...10h3008a&link_type=abstract

New Journal of Physics, Volume 10, Issue 8, pp. 083008 (2008).

Physics

Scientific paper

The effect of an electron cloud on the longitudinal coupling impedance is studied by idealizing it as a cold and uniformly distributed non-neutral plasma of electrons. The beam pipe is assumed to be of circular cross section with a thick resistive wall and the beam charge is idealized as a uniform disk. The electron contribution to the charge and current densities is obtained from the collective electron response to the beam passage through the pipe. In the presence of the electron background, a general closed formula for the longitudinal coupling impedance is obtained. The screening of the coupling impedance with the density of the electron plasma is studied and discussed for typical parameters in an accelerator beam pipe for the under-dense and the over-dense plasma regions.

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