HL-2A装置杂质线辐射测量的初步结果

杂质作为等离子体和第一壁相互作用的产物，由于能强烈地影响等离子体品质而一直是人们关注的焦点之一。杂质作为托卡马克中热辐射和冷电子的来源，影响等离子体能量和粒子的平衡，进而影响等离子体密度、温度和电流的分布，制约着托卡马克等离子体的输运和稳态运行。     

HL-1M装置中电子回旋加热等离子体的热输运研究

研究反常输运一直是托卡马克的重要任务之一，实验已经证明了这些反常输运主要是由等离子体温度和密度梯度驱动的湍流引起的。以前的实验结果表明在具有内部输运垒的高参数等离子体中，离子的热扩散可以减小到新经典水平。这种输运的减小被认为是剪切流对离子温度梯度模的抑制作用。而电子的热输运目前是一个研究的热点。     

用激光吹气注入高Z杂质使HL-1M装置放电有效地安全终止的研究

现在国际上大装置纷纷发现破裂放电而导致电流突然中止造成装置遭受重大的危害，因为能量熄灭阶段存在强烈的热通量，而且在电流熄灭阶段中产生强烈的逃逸电子，使得第一壁材料可运行的时间大大缩减；同时在真空器壁上产生很强的电磁力。所以，必须在大装置上建立一种避免和软化能量衰竭与电流衰竭，并且控制预计的放电破裂或突然终止放电的措施。     

HL-1M装置锯齿活性的时空结构分析

等离子体中心的MHD现象可以用软X射线针孔相机进行观测。在HL-1M装置上我们建立了一套由3个软X射线针孔相机共60道探测弦组成的探测系统。奇异值分解(SVD)方法能将信号分解成正交的空间和时间两组本征向量，并且可以将复杂的时空成份分离开来，使各种不同成份的空间结构和时间演变规律一一对应，从而便于了解MHD现象的重复时间和特征半径。     

Tuning Effect on the Electron Energy Distribution Function of an Inert Gas Mixture in nitrogen Inductively Coupled Plasma Discharges

By using a Langmuir probe, the electron energy distribution function (EEDF) is measured in inductively coupled plasma discharges in N2/Ar mixtures at 200W rf powers. In pure N2 discharges a Maxwellian EEDF is observed.When the mixing ratio of Ar increases, the distribution of high-energy electrons evolves with a different trend from that of low-energy electrons, resulting in an apparent “two temperature structure” of the EEDF. We discuss this non-Maxwellian EEDF and its effect on the measurement and the interpretation of “electron temperature”by both the probe and line ratio technique.     

Energy Density in Quark-Gluon Plasma

We study the energy density in quark-gluon plasma. At the very high temperature, the quark matter is a hot and dense matter in the colour deconfinement condition, and quarks can coalescent diquarks. Energy density of this system is worked out and compared with the energy density in the other two kinds of situations. Possible energy density is about ε0≈2.4 GeV/fm^3 according to our estimation for quark matter including diquarks.     

Instability of Longitudinal Wave in Magnetized Strongly Coupled Dusty Plasma

Instability of longitudinal wave in magnetized strongly coupled dusty plasmas is investigated. The dust chargigrelaxation is taken into account. It is found that there exists threshold of interdust distance for the instability of wave, which is determined significantly by the dust charging relaxation, the coupling parameter of high correlation of dust as well the strength of magnetic field.     

核物理与等离子体物理——核物理与等离子体物理学科研究进展

编制了一个新的三维光路程序，可以计算任意方向的光线通过网络的轨迹，程序将更准确地模拟真实激光光束在柱型腔靶中的三维传播。设计了平板、球体、柱体等几何体计算模型，通过一系列的检验和考察，证明了程序计算的光路轨迹的可靠性。