Development of microwave cavities for measurement of muonium hyperfine structure at J-PARC

Author:

Tanaka K S12ORCID,Iwasaki M3,Kamigaito O3,Kanda S456,Kawamura N456,Matsuda Y2,Mibe T567,Nishimura S45,Saito N58,Sakamoto N3,Seo S23,Shimomura K456,Strasser P456,Suda K3,Tanaka T23,Torii H A28,Toyoda A567,Ueno Y23,Yoshida M69

Affiliation:

1. Cyclotron and Radioisotope Center, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan

2. Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan

3. RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

4. Institute of Materials Structure Science, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

5. Japan Proton Accelerator Research Complex (J-PARC), 2-4 Tokai, Ibaraki 319-1195, Japan

6. Graduate University of Advanced Studies (SOKENDAI), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

7. Institute of Particle and Nuclear Studies, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

8. School of Science, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan

9. Accelerator Laboratory, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

Abstract

Abstract The MuSEUM collaboration is planning measurements of the ground-state hyperfine structure (HFS) of muonium at the Japan Proton Accelerator Research Complex (J-PARC), Materials and Life Science Experimental Facility. The high-intensity beam that will soon be available, the H-line, allows for more precise measurements by one order of magnitude. We plan to conduct two staged measurements. First, we will measure the Mu-HFS in a near-zero magnetic field, and thereafter we will measure it in a strong magnetic field. We have developed two microwave cavities for this purpose. Furthermore, we evaluated the systematic uncertainties from such a fluctuation of microwave fields and confirmed the requirements for the microwave system; we use a microwave field distribution calculated with the finite element method.

Publisher

Oxford University Press (OUP)

Subject

General Physics and Astronomy

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