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

[Jay Benesch]

It might be amusing to model whether this scheme could be placed in the 
halls for 1 GeV positron experiments.  Our electron beam is far larger 
than what they modeled, so likely not.



https://arxiv.org/abs/2405.11186

Zhen-Ke Dou, Chong Lv, Yousef I. Salamin, Nan Zhang, Feng Wan, 
Zhong-Feng Xu, Jian-Xing Li

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.

Subjects:	Plasma Physics (physics.plasm-ph); Accelerator Physics 
(physics.acc-ph)