Session RP1 - Poster Session VIII.
POSTER session, Thursday afternoon, October 30
Fran Hill Southeast Exhibit Hall, ACC
It is shown with a test-particle model that image-charge effects induce a new mechanism for chaotic particle motion and halo formation in an intense charged-particle beam propagating through an alternating-gradient focusing channel with a small aperture, circular, perfectly conducting pipe. While our model allows for nonuniform beams with elliptic symmetry, the effects of image charges on halo formation are illustrated with a uniform Kapchinskij-Vladimirskij (KV) distribution. Halo formation and chaotic particle motion are studied for various choices of system parameters: filling factor, perveance and vacuum phase advance. Furthermore, the percentage of beam loss to the conductor wall is calculated as a function of propagating distance and aperture size.