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A global analysis of the behaviour of the ZT-40M reversed field pinch

机译：ZT-40M反向磁场收缩行为的全局分析

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摘要

Experimental data from the reversed field experiment, ZT-40M, have been re-examined in an attempt to determine the scaling behaviour of the physical plasma quantities and their fluctuations. A subset of the data is defined, allowing a reduced number of independent variables to describe the behaviour. For flat-top ZT-40M discharges the independent variables are chosen as being the toroidal current, I_φ, and the dimensionless pinch parameter, Theta , which is proportional to the ratio of the toroidal current to the toroidal magnetic flux. The amplitudes of the dependent variables, including the electron temperature, plasma resistance, toroidal flux, the ratio of I_φ to the mean electron density and their fluctuation amplitudes, exhibit minima as functions of Θ for constant I_φ. These minima move towards lower Theta values with increasing I_φ. Over the range of conditions for acceptable operation, the scaling of variables with I_φ is not unique but depends on the variation of Θ as I_φ increases. The Θ variation is governed by the specific conditions (such as constant poloidal β, βp) chosen to set the desired RFP operational constraints. Contour plots of the dependent variables versus the two independent variables, I_φ and Θ, allow the determination of the I_φ-Θ trajectory that corresponds to discharges that meet the chosen condition. The analysis shows that the amplitude of the low frequency fluctuations correlates with the mean β_p and energy confinement time of ZT-40M. By modifying the external circuits on ZT-40M, low frequency fluctuations were reduced. Comparing the designs of different RFP experiments and their operating behaviour, these modifications suggest design changes for present and future RFP experiments that will benefit their performance.
机译：来自反向场实验ZT-40M的实验数据已被重新检查，以尝试确定物理等离子体量的标度行为及其波动。定义了数据的子集，从而减少了数量的自变量来描述行为。对于平顶ZT-40M放电，将独立变量选择为环形电流I_φ和无量纲收缩参数Theta，该参数与环形电流与环形磁通之比成比例。因变量的幅度，包括电子温度，等离子体电阻，环形通量，I_φ与平均电子密度之比及其波动幅度，对于常数I_φ表现为Θ的最小值。这些最小值随着I_φ的增加而朝着较低的Theta值移动。在可接受操作的条件范围内，具有I_φ的变量的缩放比例不是唯一的，而是取决于随着I_φ的增加Θ的变化。 Θ变化由选择来设置所需RFP操作约束的特定条件（例如恒定倍数β，βp）控制。因变量与两个自变量I_φ和Θ的等高线图可以确定与满足选定条件的放电相对应的I_φ-Θ轨迹。分析表明，低频波动的幅度与ZT-40M的平均β_p和能量约束时间有关。通过修改ZT-40M上的外部电路，可以减少低频波动。比较了各种RFP实验的设计及其操作行为，这些修改建议针对当前和将来的RFP实验进行设计更改，这将有益于其性能。

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  • 来源
    《Nuclear fusion》 |1995年第8期|p. 935-958|共24页
  • 作者

    J.A. Phillips; D.A. Baker; R.F. Gribble;

  • 作者单位

    Los Alamos National Laboratory, Los Alamos, New mexico, United States of America;

    Los Alamos National Laboratory, Los Alamos, New mexico, United States of America;

    Los Alamos National Laboratory, Los Alamos, New mexico, United States of America;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
  • 关键词

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