Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprk16009w&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The usual linearized Vlasov equation for longitudinal motion of a bunched beam leads to a singular integral equation, with singularity where the coherent frequency equals a single-particle frequency: ω=Ω(J). A discretization for numerical solution of the equation in this form is not justified. A simple transformation gives a system which can be approximated by a matrix equation, because the new integral operator A is compact. The bunch becomes unstable at the current I for which det(1-A(ω,I)) first has a zero on the real ω-axis. Here A is a nonlinear function of ω. The theory and a realistic example will be presented.
Ellison James
Venturini Marco
Warnock Robert
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