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HT-7

HT-7. ASIPP. 等离子体 麦克斯韦 协强的测量 The measurement of plasma Maxwell stress on the HT-7 tokamak 2006 HT-7 experimental proposal From edge probe team. Presented by W. Zhang , G. S. Xu Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China gsxu@ipp.ac.cn 2006.04.20. Principle.

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HT-7

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  1. HT-7 ASIPP 等离子体麦克斯韦协强的测量 The measurement of plasma Maxwell stress on the HT-7 tokamak 2006 HT-7 experimental proposal From edge probe team Presented by W. Zhang , G. S. Xu Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China gsxu@ipp.ac.cn 2006.04.20

  2. Principle • 等离子体是一个电磁体系,除了静电涨落之外,还有大量的磁涨落,磁涨落在有些条件下对等离子体的约束起到重要的作用。 • 磁涨落可以通过麦克斯韦协强驱动等离子体流或者吸收等离子体流的能量。 • 等离子体流的剪切已经被证明对等离子体输运起到重要的抑制作用。 • 麦克斯韦协强虽然是一个重要的物理量,但是在高温等离子体中很难测量。

  3. Motivation • 前人的实验对磁涨落的测量,主要集中在低频300 kHz以下,高频精确测量的数据较少 • 我们这轮实验制作了一个高响应的前置放大器,希望能够扩展测量线路的通频带。 • 在实验之前进行了台面实验,以确定测量线路造成的信号幅度衰减。 • 希望通过这些改进,能够精确测量局部磁涨落和麦克斯韦协强。

  4. 台面实验的一些结果 台面实验使用的是一对线圈产生平行磁场,使用了一个信号发生器作为电源。 本底噪声(使用一根短信号线测量的结果)

  5. 加放大器前后的比较 未加放大器 加放大器

  6. 实验条件 • Ip = 70 kA 和 100 kA 欧姆放电,要求放电平稳,等离子体位移很平 • 密度1.5~2左右及密度2.5以上,纵场3800~4200,要求MHD幅度很小,20炮左右重复放电,3分钟一炮。

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