HL-2A装置上电子内部输运垒的形成机制研究

项目名称： HL-2A装置上电子内部输运垒的形成机制研究

项目编号： No.11475057

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： 石中兵

作者单位： 核工业西南物理研究院

项目金额： 98万元

中文摘要： 等离子体电子热运输问题是未来聚变反应堆中要解决的主要课题之一。电子的热输运决定着聚变反应堆是否能进行自持的热核反应。为了获得高约束品质的等离子体，需要弄清等离子体中形成内部输运垒的物理机制。本项目将开展在大功率辅助加热和驱动条件下内部输运垒形成机制的研究，重点研究在内部输运垒形成期间等离子体电子热pinch与动量输运的规律与机制。通过改变ECRH/ECCD的沉积位置和驱动效率，来控制等离子体剖面分布、旋转和径向剪切，降低由湍流引起的反常输运，从而使电子温度梯度增大，进而实现形成电子内部输运垒和改善等离子体约束品质。研究在ECRH沉积区域内外，等离子体旋转速度分布变化与热pinch的关系，芯区湍流变化规律。另外利用超声分子束注入、低杂波电流驱动和中性束注入等辅助手段，研究影响电子热输运的主要因素及产生电子内部输运垒的可能性和条件，给出形成电子内部输运垒的加热和驱动的功率域条件。

中文关键词： 内部输运垒；输运；等离子体

英文摘要： Electron heat transport is one of the most important topics in the study of fusion plasmas, because the sustainability of the fusion reaction and the performance of the plasma confinement are governed by the electron heat transport. To achieve high plasma confinement, it is crucial important to clarify the physics mechanism of the formation of the internal transport barrier (ITB). In this work, the formation of the ITB during high power auxiliary heating will be studied. We will focus on the physics mechanism of electron heat pinch and momentum transport, and their contribution to the ITB plasmas. By changing the deposition position and current drive efficiency of electron cyclotrong resonance heating and cuurent drive (ECRH/ECCD), the plasma current profile, as well as the plasma rotation and radial electric shear, can be controlled. As a result, the abnormal thermal transport driven by turbulence will be reduced, leading to the increase of the electron temperature gradient in a particular region. The relationship among the turbulence, heat pinch and plasma rotation around the ECRH deposition position, will be studied. Furthermore, with the aid of supersonic molecular beam injection (SMBI), low hybrid current drive (LHCD) and neutral beam injection (NBI), the key parameters to reduce electron heat transport and the condition (such as the power threshold and the radial shear) to trigger ITB will be studied.

英文关键词： ITB;transport;plasma