托卡马克中的边界局域模的简单介绍.pdfVIP

托卡马克中的边界局域模的简单介绍 夏天阳 1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China. 2 Lawrence Livermore National Laboratory, Livermore, CA 94550, USA June 5th, 2015 • ASIPP This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344, LLNL LDRD project 12-ERD- 022, and LDRD project 11-ERD-058, This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences. This work was supported by program of Fusion Reactor Physics and Digital Tokamak with the CAS “One-Three-Five” Strategic Planning , and the JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC: No.11261140328 and NRF: No. 2012K2A2A6000443). It was supported by the China Natural Science Foundation under Contract Noand the National 1 Magnetic Confinement Fusion Science Program of China under Contracts No. 2014GB106001 and 2013GB111002. LLNL-PRES-669936. 高约束模（H模）和台基区 Multi-field two-fluid model in BOUT++  1982年，ASDEX首次实现H模。  在H模下，边缘等离子体湍流被抑制，边 缘等离子体的输运水平显著降低，这一现 象被称为边缘输运垒(ETB)。台基区 (pedestal)形成。  优点：改善核心区等离子体的约束。减小 自持反应所需要的装置体积，降低建造费 用。为ITER计划的开展提供了必要的物理 基础。  缺点：剖面梯度过大，导致台基区的等离 子体非常不稳定→边界局域模(ELM) 典型的H模与L模的密度温度和电流密度剖面 2 边界局域模 Multi-field two-fluid model in BOUT++  ELM：托卡马克中，随着加热的不断进行，核心区的能量和粒子不断进入台基区， 但是却无法输运离开分离面。这导致台阶区的梯度越来越大，并最终发生爆发 式的坍塌。大量等离子体在极短的时间内喷发出去，越过分离面，进入刮削层 (SOL)。  实验特点： • 频率：几十至几百赫兹 • 导致大量的能量损失：穿过等离子体边界的能量损失中，ELM引起的比例为