[PEPPo] A Liquid Xenon Positron Target Concept

[Jay Benesch]

https://arxiv.org/abs/2303.04330

A Liquid Xenon Positron Target Concept

Max Varverakis, Robert Holtzapple, Hiroki Fujii, Spencer Gessner

Positron targets are a critical component of future Linear Colliders. 
Traditional targets are composed of high-Z metals that become brittle 
over time due to constant bombardment by high-power electron beams. We 
explore the possibility of a liquid xenon target which is continuosly 
refreshed and therefore not susceptible to the damage mechanisms of 
traditional solid targets. Using the GEANT4 simulation code, we examine 
the performance of the liquid xenon target and show that the positron 
yield is comparable to solid targets when normalized by radiation 
length. Additionally, we observe that the peak energy deposition density 
(PEDD) threshold for liquid xenon is higher than for commonly employed 
metal targets, which makes it an attractive, non-toxic positron target 
alternative. We develop parameter sets for demonstration applications at 
FACET-II and future Linear Colliders.
Subjects:	Accelerator Physics (physics.acc-ph)
Cite as:	arXiv:2303.04330 [physics.acc-ph]