Concept of a Staged FEL Enabled by Fast Synchrotron Radiation Cooling of Laser-Plasma Accelerated Beam by Solenoidal Magnetic Fields in Plasma Bubble

TL;DR

This paper proposes a staged free-electron laser design utilizing fast synchrotron radiation cooling of laser-plasma accelerated beams via high magnetic fields generated by screw-shaped laser pulses, enabling potential advancements in plasma-based FELs.

Contribution

It introduces a novel concept of a staged plasma-acceleration FEL that incorporates a new method for rapid beam emittance cooling using solenoidal magnetic fields in plasma bubbles.

Findings

Conceptual outline of a staged plasma FEL system.

Discussion of the feasibility and further research needed.

Potential for improved beam quality in plasma-based FELs.

Abstract

A novel method for generating GigaGauss solenoidal field in laser-plasma bubble, using screw-shaped laser pulses, has been recently presented in arXiv:1604.01259 [physics.plasm-ph]. Such magnetic fields enable fast synchrotron radiation cooling of the beam emittance of laser-plasma accelerated leptons. This recent finding opens a novel approach for design of laser-plasma FELs or colliders, where the acceleration stages are interleaved with laser-plasma emittance cooling stages. In this concept paper we present an outline of how a staged plasma-acceleration FEL could look like and discuss further studies needed to investigate the feasibility of the concept in detail.