Collective Thomson scattering in non-equilibrium laser produced two-stream plasmas
K. Sakai, S. Isayama, Nima Bolouki, M. Habibi, Yao-Li Liu, Yu-Hua Hsieh, Hsu-Hsin Chu, Jyhpyng Wang, Shih-Hung Chen, T. Morita, Kentaro Tomita, Ryo Yamazaki, Y. Sakawa, Shuichi Matsukiyo, Yasuhiro Kuramitsu
Abstract
We investigate collective Thomson scattering (CTS) in two-stream non-equilibrium plasmas analytically, numerically, and experimentally. In laboratory astrophysics, CTS is a unique tool to obtain local plasma diagnostics. While the standard CTS theory assumes plasmas to be linear, stationary, isotropic, and equilibrium, they are often nonlinear, non-stationary, anisotropic, and non-equilibrium in high energy phenomena relevant to laboratory astrophysics. We theoretically calculate and numerically simulate the CTS spectra in two-stream plasmas as a typical example of a non-equilibrium system in space and astrophysical plasmas. The simulation results show the feasibility to diagnose two-stream instability directly via CTS measurements. To confirm the non-equilibrium CTS analysis, we have developed an experimental system with a high repetition rate tabletop laser for laboratory astrophysics.