Development of a narrow linewidth ns-pulsed vacuum ultraviolet laser for the selective removal of ultratrace radon

2015 Fiscal Year Final Research Report

• Project/Area Number: 25707020
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: The University of Tokyo (2015); Japan Atomic Energy Agency
• Principal Investigator: IWATA Yoshihiro 東京大学, 工学(系)研究科(研究院), 助教 (20568191)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: ラドン / 共鳴イオン化 / 真空紫外レーザー / 光パラメトリック発生 / 暗黒物質 / 宇宙物理

Outline of Final Research Achievements

Radon is one of the major background sources for dark matter search using xenon. To selectively remove radon atoms by resonance ionization, a ns-pulsed vacuum ultraviolet laser with high-power, narrow linewidth and high wavelength stability was developed using the four-wave mixing technique. Besides, the resonance ionization technique was applied to the analysis of krypton impurity. Krypton concentration in the xenon gas sample taken from the XMASS detector was obtained to be about 100 ppt with a measurement error of 7%.

Free Research Field

数物系科学