Compact Spin-Polarized Positron Acceleration in Multi-Layer Microhole Array Films

TL;DR

This paper introduces a novel method for compact, high-gradient, spin-polarized positron acceleration using multi-layer microhole array films, achieving over 90% polarization and TeV/m gradients, advancing accelerator technology.

Contribution

The paper presents a new approach employing multi-layer microhole films and high-density electron beams to efficiently accelerate and polarize positrons at unprecedented gradients.

Findings

Achieves over 90% positron polarization.

Provides acceleration gradients of about TeV/m.

Enables cascade acceleration with multi-layer design.

Abstract

Compact spin-polarized positron accelerators play a major role in promoting significant positron application research, which typically require high acceleration gradients and polarization degree, both of which, however, are still great challenging. Here, we put forward a novel spin-polarized positron acceleration method which employs an ultrarelativistic high-density electron beam passing through any hole of multi-layer microhole array films to excite strong electrostatic and transition radiation fields. Positrons in the polarized electron-positron pair plasma, filled in the front of the multi-layer films, can be captured, accelerated, and focused by the electrostatic and transition radiation fields, while maintaining high polarization of above 90% and high acceleration gradient of about TeV/m. Multi-layer design allows for capturing more positrons and achieving cascade acceleration. Our method offers a promising solution for accelerator miniaturization, positron injection, and polarization maintaining, and also can be used to accelerate other charged particles.