Diagnostics of relativistic electron beam dynamics in a torus plasma based on laser inverse Compton scattering

这项研究项目是为了研究托卡马克装置中产生的相对论失控电子束和大电流相对论等离子体。主要结果如下：1.基于激光逆康普顿散射(LCS)的失控电子束诊断(1)JT-60U托卡马克装置中相对论失控电子束等离子体参数的LCS光子能谱、光子数和散射方向的基本性质。(2)背景辐射的基本性质，如相对论性布里斯强辐射、相对论同步辐射、逆康普顿散射。(3)在JT-60U托卡马克装置上安装了一台激光激光器、一根激光传输光缆、一个真空窗口、一个探测器和数据采集。强流相对论等离子体的研究(1)在JT-60U托卡马克上观测到的破裂产生的失控等离子体。研究表明，逃逸电子可以通过杂质粒子注入而耗尽。结果表明，逃逸电子流的时间行为可以用雪崩产生的逃逸电子及其与同步辐射的衰变的平衡来解释。(2)电子回旋波加热和逃逸电子的产生相结合避免了电流猝灭破坏。

This research project has been carried out to study relativistic runaway electron beams and high-current relativistic plasmas created in tokamak devices. Major results are shown below.1. Diagnostics of Runaway Electron Beams based on Laser Inverse Compton Scattering (LCS)(1) Basic properties of energy spectrum of LCS photons, photon number, and scattering directions for plasma parameters of relativistic runaway electron beams in JT-60U tokamak have been evaluated.(2) Basic properties of background radiations, e.g. relativistic bremsstralung radiation, relativistic synchrotron radiation, inverse Compton scattering, have been evaluated.(3) A YAG laser, a laser transmission fiber cable, a vacuum window, a detector, and data acquisitions have been installed in JT-60U tokamak.2. Study of High-Current Relativistic Plasmas(1) Disruption generated runaway plasmas observed in JT-60U tokamak have been investigated. It has been shown that runaway electrons can be exhausted by impurity pellet injection. It has been suggested that the temporal behavior of runaway electron current can be explained by the balance of avalanche generation of runaway electrons and their decay with synchrotron radiation.(2) It has been shown that current quench disruption is avoided by the combination of electron cyclotron wave heating and generation of runaway electrons.