Reduction of bremsstrahlung recoil force on the bare charge of a relativistic test particle

摘要

A useful expression is derived for the collective bremsstrahlung recoil force on the bare charge of an unperturbed relativistic test particle in a nonequilibrium beam-plasma system. In this part of the bremsstrahlung process, the field of the test particle is scattered by the second- and third-order dynamic polarization current induced by the test particle and acts back on the bare charge of the unperturbed test particle. Attention is focused on the component of the recoil force on the bare particle, arising from self-interaction by the self field scattered in first order off the particle's own second-order dynamic polarization. This work is needed for calculations of collective bremsstrahlung instability in nonequilibrium relativistic beam-plasma systems.