BEAM DYNAMICS IN COMPTON STORAGE RINGS WITH LASER COOLING

Compton sources are capable to produce intense beams of gamma-rays necessary for numerous applications, e.g. production of polarized positrons for ILC/CLIC projects, nuclear waste monitoring. These sources need high current of electron beams of GeV energy. Storage rings are able to accumulate a high average current and keep it circulating for a long time. The dynamics of circulating bunches is affected by large recoils due to emission of energetic photons. We report results of both an analytical study and a simulation on the dynamics of electron bunches circulating in storage rings and interacting with the laser pulses. The steady-state transverse emittances and energy spread, and dependence of these parameters on the laser pulse power and dimensions at the collision point were derived analytically and simulated. It is shown that the transverse and longitudinal dimensions of bunches are dependent on the power of laser pulses and on their dimensions as well. Conditions of the laser cooling were found, under which the electron bunches shrink due to scattering off the laser pulses. INTRODUCTION COMPTON RINGS Compton rings are perspective bright sources of electromagnetic radiation ranged from hard x rays to gamma rays due to their ability to store high current beams and keep them circulating for a long time. With developing of the lasers with high average power and optical resonators capable to accumulate high power and dense pulses, the intense Compton sources are coming into play (see e.g. [1]). The dynamics of circulating bunches is affected by large recoils due to emission of energetic photons. With developing of the optical resonators storing the powerful high density pulses, the beam behavior will be changed. The report is aimed to present a survey of the results of theoretical study on the beam dynamics in Compton storage rings. The results are verified by the simulations.