托卡马克破裂期间逃逸电子损失机制研究

项目名称： 托卡马克破裂期间逃逸电子损失机制研究

项目编号： No.11475221

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 曾龙

作者单位： 中国科学院合肥物质科学研究院

项目金额： 80万元

中文摘要： 未来ITER破裂时，将会有70%的电流转化为逃逸电流。逃逸电流损失时，由于其高能量和局域性，逃逸电流损失会直接导致装置壁的熔化等损伤。但是逃逸电流损失机制目前尚不清楚。因此，研究破裂期间逃逸电流损失行为对托卡马克装置安全运行至关重要。 本项目计划开展磁扰动、宏观MHD不稳定性对逃逸电流损失行为影响和逃逸电流的反常损失三方面的研究。 （1）分析电流淬灭阶段磁扰动幅度与逃逸电流之间的关系；研究磁扰动幅度对等离子体宏观参数（环向磁场、电流、密度和温度等）的依赖性；（2）分别研究逃逸电流与破裂前等离子体芯部锯齿和2/1撕裂模幅度的关系；确定宏观MHD不稳定性对逃逸电子损失的影响；（3）观测逃逸电流平台阶段各种反常损失行为，分析各种损失行为之间的联系以及对等离子体宏观参数的依赖关系，尽可能全面的了解逃逸电流的反常损失。

中文关键词： 逃逸电子；破裂；托卡马克；等离子体；磁约束聚变

英文摘要： Runaway electron (RE) currents of several mega amperes are expected to be generated in ITER disruptions due to avalanche multiplication. An uncontrolled loss of these high-energy electrons to the plasma facing components might cause serious damage.However, the loss process has not been clarified. to understand the RE loss is one of the key issues for the future ITER. Three distinct types of RE related relaxation phenomena will been addressed in the project. (1) to find out the relation between the magnetic fluctuation level during the current quench and RE current, and the dependence of the magnetic fluctuation level on plasma parameters, such as toroidal magnetic field,plasma current, density, etc; (2) to understand the effect of sawtooth and 2/1 tearing mode before the disruption on RE losses, respectively; (3) to observe the RE related relaxation phenomena during the RE plateau phase; to discover the possible relation among them and the dependence on plasma parameter and even understand the dirving mechanism of the RE losses.

英文关键词： runaway electron;disruption;tokamak;plasma;magnetic confined fusion