HL—1M低混杂波电流驱动中的径向扩散效应

本文利用低温杂波电流驱动的准线性理论模型，研究了由于磁场磁机涨落而引起的快电子的反常输运对驱动电流分布和驱动效率的影响。结果表明，高能电子径向扩散将使驱动电流分布变平和展宽，同时驱动电流减小。     

低杂波电流驱动中径向扩散效应的数值模拟

应用改进后的程序详细计算了不同径向扩散系数对低杂波电流驱动剖面分布的影响。通过计算发现:考虑径向扩散效应后,驱动电流分布变平展宽,电流驱动的分布随着扩散系数的增大逐渐向外层移动,由局域性分布演化成非局域性分布;驱动电流的大小和效率随着扩散系数的增大而降低。     

低杂波电流驱动中径向扩散效应的数值模拟

应用改进后的程序详细计算了不同径向扩散系数对低杂波电流驱动剖面分布的影响。通过计算发现:考虑径向扩散效应后，驱动电流分布变平展宽，电流驱动的分布随着扩散系数的增大逐渐向外层移动，由局域性分布演化成非局域性分布；驱动电流的大小和效率随着扩散系数的增大而降低。     

HL—1M装置上低混杂波电流驱动实验研究

本文介绍了在ＨＬ－１Ｍ装置上进行的低混杂波电流驱动实验研究。     

HL－1M感应与低杂波组合电流驱动研究

本文结合ＨＬ－１Ｍ的基本参数，利用准线性的低杂波电流驱动理论和等离子体的电回路方程．研究了在控制等离子体总电流不变情形下欧姆感应和低杂波注入组合驱动电流的问题。结果表明，这一组合驱动方案对ＨＬ－１Ｍ装置的运行是可行的，其驱动电流分布可以通过改变低杂波注入功率、波谱形状、等离子体电子温度、密度以及总等离子体电流等加以控制。组合驱动的电流分布将优于欧姆驱动的电流分布，并可能抑制诸如锯齿振荡等一些ＭＨＤ不稳定性。     

关于HL－1托卡马克的低杂波电流驱动效率

在一些ＨＬ－１托卡马克的低杂波电流驱动（ＬＨＣＤ）实验中，驱动效率对低杂波注入功率和等离子体电子密度等参数的依赖关系很分散。分析表明，其可能原因是驱动电流的计算不够精确，携带电流的快电子的相当部分逃离等离子体后损失到孔栏或真空室壁上以及放电的重复性差等。本文对这些问题进行了仔细的讨论     

低杂波电流驱动的数值模拟

通过求解二维FokkerPlanck方程,得到了HT7托卡马克低杂波驱动电流随时间的演化关系及其空间分布,理论值与实验结果基本符合,为HT7托卡马克实验提供了理论依据.通过解电流扩散方程,考虑了快电子的径向扩散效应对驱动电流的影响 关键词： 低杂波电流驱动 数值模拟 径向扩散     

HL—1M感应与低杂波组合电流驱动研究

本文结合ＨＬ－１Ｍ的基本参数，利用准线性的低杂波电流驱动理论和等离子体的电回路方程，研究了在控制等离子体总电流不变情形下欧姆感应和低杂洲入组合驱动电流的问题。结果表明，这一组合驱动方案对ＨＬ－１Ｍ装置的运行是可行的，其驱动电流分布可以通过发迹低杂流注入功率、波谱形状、等离子体电子温度、密度以及总等离子体电流等加以控制。     

LHCD的径向扩散效应

根据低杂波驱动电流的准线性理论，利用二维Ｆｏｋｋｅｒ－Ｐｌａｎｋ方程模拟程序，求出速度空间扩散的驱动电流，考虑快电子的径向扩散效应对驱动电流的影响，对原有程序加以完善，并ＨＴ－７，ＨＴ－６Ｍ装置进行了大量模拟计算，结果表明，考虑径向扩散后，原有的驱动电流以分变平很宽，并且变得光滑，同时驱动电流明显减小，驱动效率降低，另外，对于不同的径向扩散系数，电流密度的分布也有较大的差异。     

电子温度对HL－1托卡马克低杂波电流驱动的影响

本文利用较简单的计算模型计算低杂波沿射线轨迹的能量沉积和电流分布。结果表明，当等离子体中心电于温度不太高（Ｔｅ＜１ｋｅＶ）时，边缘冷等离子体区电子－离子碰撞吸收的能量占相当大的比例，因此电流驱动效率较低。提高中心和边缘电子温度，将较大幅度地增加低杂波电流驱动效率，从而可解释为什么在小托卡马克中低杂波电流驱动效率比在大、中型托卡马克中小得多。     

Control of LHCD on the HL-2A Tokamak

in order to study non-indutive plasma current production, the lower hybrid current drive（LHCD） experiment on the HL-2A tokamak is carried out. Simultaneously a microcomputer has been used to control the whole LHCD system. During the experiment this year, we can monitor and protect the LHCD system by use of the microcomputer control system, which will imediately switch off the microwave power to be launched into the tokamak if the plasma is disrupted. All this ensure that the microwave is injected into the equipment correctly.     

HL-2M装置低混杂波电流驱动系统高精度数字温度测量仪的研制

为HL-2M低混杂波电流驱动系统研制了16路J型数字校准热电偶测温仪,可实现16通道温度测量,测温范围为0~250°C,测量范围内误差绝对值小于1°C,具有本地高清液晶显示温度值和电脑远程温度采集功能。该测温仪已成功用于HL-2M低混杂波加热系统的调试实验,对不同输出功率条件下高功率速调管输出腔温度进行了测量,保证了速调管运行的安全性。     

HL-2M 低杂波电流驱动系统研制

HL-2M 装置的 LHCD 系统已经完成了包括 2MW 波源、2MW 传输线和 4MW 天线的工程研制,该 系统参数指标为 3.7GHz/2MW/3s,使用 4 只 TH2103C1 型速调管。建成了 4 条 500kW 功率容量的传输线,研制 了 1 套 4MW 功率容量的低杂波天线,并完成了与系统配套的电源、微波源、传输部件、控保系统以及水冷、真 空、测量采集等辅助系统的研制。     

HL－1装置中LHCD和等离子体参数的关系

本文研究了在ＨＬ－１托卡马克的不同放电阶段的低混杂波驱动特性。给出了驱动电流及驱动效率和等离子体参数，如电子平均密度ｎｅ、等离子体电流Ｉｐ及纵向磁场的关系。也给出和分析了波驱动和入射波功率的关系。在放电平段，对正反向驱动效率进行了研究和比较。     

Study of the Protection System for LHCD on the HL-2A Tokamak

LHCD experiment has been carried through in HL-1M tokamak since 1995, and the work is successful. This years the LHCD experiment would go ahead on the HL-2A tokamak that had been improved from HL-1M system.     

Study of LHCD in Non-Circle Cross Section HL-2A Tokamak

In the review paper of N. J. Fish[1], the topics concerning the basic theory of lower hybrid wave heating and current drive are presented. Brambilla＇s spectrum determines the injecting wave resonance regime and its power distribution. The theories and experiments have demonstrated that the LH waves interact efficiently with the high energy electrons in the tail of their distribution in velocity space. LHCD has been used in many devices such as JET, JT-60U, and ASDEX,     

Scaling Law of Runaway Electrons in HL-1M Tokamak

Runaway electrons in tokamaks have been widely studied theoretically and experimentally. The runaway confinement time τr in ohmic and additionally heated tokamak plasmas presents an anomalous behavior compared with theoretical predictions based on neoclassical models. A one-dimensional numerical model including generation, acceleration and loss effect of runaway electrons is used to deduce the runaway energy εr dependence on the runaway confinement time.     

Scaling Properties of Runaway Electrons in HL-1M Tokamak

1 Introduction Runaway electrons in tokamaks have been widely studied theoretically and experimentally. Runaway electrons have received lately a great attention due to several reasons： a） the possibility to study electromagnetic turbulence by measuring the runaway flux fluctuations and its energy spectra, and b） the runaway electrons are powerful diagnostics capable of yielding valuable information on the actual distribution function of fusion experiments.     

Disruption Mitigation Using Laser Ablation of High-Z Impurities in HL-1M Tokamak

Major plasma disruptions are considered to be a serious problem for development of tokamak fusion reactors. The preliminary experiment results in HL-1M presented here describe the methods of amelioration of plasma current quench in major disruptions using laser ablation of high-Z impurities, which support the design of next generation large tokomaks like ITER. Using injection of impurity with higher electric charge can produce resistive highly radiating plasma and increase the radiation cooling of plasma to make a safe termination of the disruption. It can be possibly a simple and potential approach to decrease significantly the plasma thermal energy and magnetic energy before a disruption then obtain a safe plasma termination. The magnetic energy can be dissipated by impurity radiation .