Transverse Effects of Microbunch Radiative Interaction
نویسندگان
چکیده
In this article we study effects of microbunch cooperative electromagnetic radiation in a bend on transverse beam dynamics. An overtaking radiative interaction between different parts of the bunch results in three major forces variable along the bunch. Longitudinal force leads to energy loss and causes the bunch emittance growth in the bend due to the dispersion effect. Radial force consists of logarithmically large “Talman” centrifugal force and smaller centripetal force. Due to general radius-energy dependence in the bend, the “Talman” force does not affect beam dynamics while the centripetal force leads to projected emittance growth. Finally, radial and vertical focusing forces lead to trajectory distortions which vary along the bunch. These cooperative forces significantly affect the dynamics of short high-populated bunch in bends. present address: Phys. Dept., Univ. of Michigan, Ann Arbor, MI 48109
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