Laser cooling of electron beams for linear colliders

TL;DR

This paper proposes a new laser-based electron beam cooling technique for linear colliders, significantly reducing beam emittance and enabling advanced collider configurations, with manageable depolarization effects.

Contribution

It introduces a novel laser cooling method during collision, achieving unprecedented emittance reduction and expanding collider design possibilities.

Findings

Transverse emittance reduced by a factor of 10 per stage

Ultimate emittances below other methods

Beam depolarization of 5-15% per stage

Abstract

A novel method of electron beam cooling is considered which can be used for linear colliders. The electron beam is cooled during collision with focused powerful laser pulse. With reasonable laser parameters (laser flash energy about 10 J) one can decrease transverse beam emittances by a factor about 10 per one stage. The ultimate transverse emittances are much below those achievable by other methods. Beam depolarization during cooling is about 5--15 % for one stage. This method is especially useful for photon colliders and opens new possibilities for e+e- colliders.