Basic study of gaseous magnetism and its application

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H01921
• 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: The University of Tokyo
• Principal Investigator: Inada Toshiaki 東京大学, 素粒子物理国際研究センター, 特任助教 (20779269)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 磁気光学効果 / パルス強磁場 / 真空非線形QED

Outline of Final Research Achievements

We made an optical system composed of a high-finesse Fabry-Perot cavity (F~500,000) for 1064 nm Nd:YAG laser and feedback electronics developed to stabilize the cavity resonance frequency against the relatively tight cavity length condition (FWHM~3pm). The racetrack magnet system was newly designed to accommodate the lateral peak field of 10T over the length of 20cm and incorporated to fully automated data-acquisition/magnet-control system with a shot cycle of 20s. Since noise reduction in the 50-500Hz band, which corresponds to the inverse of magnetic-field pulse width of 1ms, is critical, birefringence that intrinsically resides in a SiO2/Ta2O5 dielectric multi-layers in the cavity mirror surface was studied throughout.

Free Research Field

素粒子・原子核・宇宙線・宇宙物理

Academic Significance and Societal Importance of the Research Achievements

精密光学の光技術と強磁場技術を融合した新たな微小磁気計測手法の開発は、ガスが低温下で示す、磁気応答の増加に対する機構解明、またこれを応用した新しい磁気光学デバイスの開発基盤として極めて重要である。さらにマクロスケールでの非線形QED過程の検証により真空の磁気光学効果として観測されれば、いわば「真空の磁化」の発見となる。