Vibration compensation interferometer with short-wavelength for steady state and high density fusion reactor

2014 Fiscal Year Final Research Report

• Project/Area Number: 24686104
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: AKIYAMA Tsuyoshi 核融合科学研究所, ヘリカル研究部, 准教授 (80370138)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 干渉計 / 非線形光学素子 / 2倍高調波 / 核融合炉 / 電子密度計測

Outline of Final Research Achievements

The fusion output will be controlled by measuring the electron density in the future fusion reactors. Therefore, high reliability and density resolution are required to the electron density measurement. We have been developed a dispersion interferometer, which is insensitive to the mechanical vibrations and can suppress fringe jump errors. In this research, we designed the optical system of short wavelength laser Nd:YAG laser dispersion interferometer, which is suitable to conditions of future fusion reactors. A bench-testing is conducted and an electron density resolution of 2×10＾18 m＾(-3) is obtained in the reactor conditions such as ITER and helical reactor FFHR-d1. It is demonstrated that the temperature control of nonlinear crystals, which is used to generate the second harmonic component, will be effective to improve the density resolution.

Free Research Field

核融合工学