2022 Fiscal Year Final Research Report

Development of the alignment monitor for muon g-2/EDM experiment

Research Project

PDF

Project/Area Number	19H01930
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Review Section	Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
Research Institution	High Energy Accelerator Research Organization
Principal Investigator	KUME Tatsuya 大学共同利用機関法人高エネルギー加速器研究機構, 機械工学センター, 講師 (40353362)
Co-Investigator(Kenkyū-buntansha)	道畑正岐東京大学, 大学院工学系研究科(工学部), 准教授 (70588855) 三部勉大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 教授 (80536938) 高増潔東京大学, 大学院工学系研究科(工学部), 教授 (70154896)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	alignment monitor / interferometer / oprical frequency comb / ball lens / muon / g-2 / EDM
Outline of Final Research Achievements	Here, we develop three basic technologies for the alignment monitor, those are an absolute distance interferometer, an optical system configured by glass ball lens, and a length measurement grid, intending to monitor relative directional changes between vanes, which configure our positron tracking detector for g-2/EDM precise measurement at J-PARC. As the results, we had obtained perspectives for the development of our alignment monitor. Length measurement with ppm uncertainty can be realized by adopting polarization maintain optics. Larger diameter ball lens is better for both collimators and reflectors, while smaller refractive index is better for collimators; however, refractive index around 2 is better for reflectors. As for length measurement grid, a configuration which monitor positions of reflectors located near sensors on each vane from above the vane is optimum. They become guidelines for developing our alignment monitor.
Free Research Field	精密測定
Academic Significance and Societal Importance of the Research Achievements	本研究を通して、光周波数コムをエタロンに通すことで、エタロンの自由スペクトル領域、FSRで決定する広い調整範囲を持つ光パルスが発生し、そのパルス間隔は、高精度高安定な光周波数コムを基準に、サブppmの不確かさで評価可能であるとの知見が得られた。これらの知見は、既存技術では実現困難なサブppmレベルの不確かさでの高精度高安定なアライメント評価を、より広範な対象に適用可能とするための技術基盤となり、本研究計画が目標とするJ-PARCにおけるg-2/EDM精密測定実験のような先端科学分野はもとより、より一般的な産業分野を含めた広範な科学、技術分野に貢献するものと期待される。