Beam dynamics design of the muon linac high-beta section

8th International Particle Accelerator Conference

Kondo, Y.^1 ; Hasegawa, K.^1 ; Otani, M.^2 ; Mibe, T.^2 ; Yoshida, M.^2 ; Kitamura, R.^3

JAEA, Tokai, Naka, Ibaraki

319-1195, Japan^1

KEK, Oho, Tsukuba, Ibaraki

305-0801, Japan^2

Univ. of Tokyo, Hongo, Tokyo

113-8654, Japan^3

关键词: Accelerating structure;    Disk-loaded structures;    Electron linacs;    Muon beam lines;    Muon science facility;    Particle velocities;    Silica aerogels;    Traveling-wave structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/874/1/012054/pdf
DOI  :  10.1088/1742-6596/874/1/012054

来源: IOP

【 摘 要 】

A muon linac development for a new muon g-2 experiment is now going on at J-PARC. Muons from the muon beam line (H line) at the J-PARC muon science facility are once stopped in a silica-aerogel target, and room temperature muoniums are evaporated from the aerogel. They are dissociated with lasers, then accelerated up to 212 MeV using a linear accelerator. For the accelerating structure from 40 MeV, disk-loaded traveling-wave structure is applicable because the particle beta is more than 0.7. The structure itself is similar to that for electron linacs, however, the cell length should be harmonic to the increase of the particle velocity. In this paper, the beam dynamics design of this muon linac using the disk-loaded structure (DLS) is described.