H line; a beam line for fundamental physics study

13th International Conference on Muon Spin Rotation, Relaxation and Resonance

Kawamura, Naritoshi^1,2 ; Toyoda, Akihisa^3,4 ; Aoki, Masaharu^5 ; Shimomura, Koichiro^1,2 ; Mibe, Tsutomu^3,4 ; Nakatsugawa, Yohei^2 ; Otani, Masashi^4 ; Saito, Naohito^3,4 ; Miyake, Yasuhiro^1,2

Muon Science Sec., Materials and Life Science Div., J-PARC, Tokai, Ibaraki

319-1106, Japan^1

Muon Science Labo., IMSS, KEK, Tsukuba, Ibaraki

305-0801, Japan^2

Hadron Sec., Particle and Nuclear Physics Div., J-PARC, Tokai, Ibaraki

319-1106, Japan^3

IPNS, KEK, Tsukuba, Ibaraki

305-0801, Japan^4

Graduate School of Science, Osaka University, Toyonaka, Osaka

560-0043, Japan^5

关键词: Beam intensity;    Fundamental physics;    Graphite target;    Kicker magnets;    Muon beam lines;    Pulsed muon beams;    Surface muons;    The standard model;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/551/1/012062/pdf
DOI  :  10.1088/1742-6596/551/1/012062

来源: IOP

【 摘 要 】

The muon facility, J-PARC (Muon Science Establishment; MUSE), has been operating since the first beam in 2008. Starting with a 200 kW proton beam, a beam intensity of 3 × 106muons/s was reached in 2009 which was the most intense pulsed muon beam in the world. From the 2 cm thick graphite target, four secondary muon beam lines are designed to be extracted. Three beam lines currently exist, the first being operational and the other two undergoing commissioning. The fourth and the last beam line, the H line, is planned to be constructed. This new beam line is designed to have a large acceptance, provides the ability to tune the momentum, and use a kicker magnet and/or a Wien filter. The H line is designed to provide an intense beam of 108surface muons/s for fundamental physics studies to observe new physics beyond the standard model. Such studies require high statistics and they need to occupy the experimental areas for a relatively long period.