[PWG] Towards a high-intensity muon source

[Jay Benesch]

The target discussion and capture scheme should be of interest.  The 
capture solenoid the authors arrived at is almost identical to the one 
we're using: reassuring.  The bearing wear issue on rotating graphite 
target is not one I had seen discussed prior to this.  Pavel's 
non-rotating target solves that so he may be aware of the issue.


https://journals.aps.org/prab/abstract/10.1103/PhysRevAccelBeams.27.023403

Han-Jie Cai, Yuan He, Shuhui Liu, Huan Jia, Yuanshuai Qin, Zhijun Wang, 
Fengfeng Wang, Lixia Zhao, Neng Pu, Jianwei Niu, Liangwen Chen, Zhiyu 
Sun, Hongwei Zhao, and Wenlong Zhan
Phys. Rev. Accel. Beams 27, 023403 – Published 27 February 2024

A high-intensity muon source driven by a continuous-wave superconducting 
linac holds the potential to significantly advance the intensity 
frontier of muon sources. Alongside advancements in accelerator 
technologies, breakthroughs in muon production target and collection 
schemes are essential. After a brief introduction to the development of 
the accelerator-driven system superconducting linac, a novel muon 
production target is proposed, utilizing a free-surface liquid lithium 
jet capable of handling the heat power generated by a proton beam with 
an energy of 600 MeV and a current of 5 mA. It is predicted by our 
simulation studies that the lithium target is more efficient in surface 
muon production compared to the rotating graphite target. The parameter 
space of the front end consisting of a lithium target and a 
large-aperture capture solenoid is explored, from the perspective of 
production efficiency, capture efficiency, and characteristics of the 
surface muon beam.