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HT-7

HT-7. ASIPP. 等离子体湍流粘滞的测量 The measurement of plasma turbulent viscosity on the HT-7 tokamak 2006 HT-7 experimental proposal From edge probe team. Presented by G.S. Xu ， W. Zhang 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 等离子体湍流粘滞的测量 The measurement of plasma turbulent viscosity on the HT-7 tokamak 2006 HT-7 experimental proposal From edge probe team Presented by G.S. Xu，W. Zhang Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China gsxu@ipp.ac.cn 2006.04.20

  2. Principle • 等离子体流可以通过剪切抑制改善等离子体约束 • 等离子体湍流可以和等离子体流之间交换能量 • 这种能量交换过程是双向的 正向能量级联：湍流粘滞阻尼等离子体流 反向能量级联：湍流协强驱动等离子体流 4. 这两个方向的过程都有可能发生，需要实验研究，虽然湍流粘滞是一个十分重要的物理量，但是在高温等离子体中非常难测量，需要设计巧妙的实验。

  3. Motivation 2005年JET上的一个著名实验组首次尝试测量湍流粘滞，但是由于JET边界参数过高，Langmuir探针存在二次电子发射问题，实验结果不太理想。而且他们的探针结构不尽合理，主要是受到气动探针制作工艺的限制。 HT-7装置的尺寸和参数范围为从事这项研究提供了得天独厚的条件： 超导装置放电时间长，且非常平稳。边界温度较低。没有探针制作工艺的限制。 因此有可能在HT-7上获得成功的测量！

  4. The results from JET

  5. 湍流粘滞测量探针 侧视图 1石墨探针 2陶瓷套管 2 2 5 2

  6. 顶视图 湍流粘滞测量探针 2 mm厚石墨套管 内径22，外径26 不锈钢圆柱 上面挖两个通孔 用于插陶瓷 7陶瓷管 伸出5 mm 7陶瓷管 与不锈钢表面平齐 45度角不锈钢上开M3螺孔 用于固定陶瓷 石墨套管上开通孔 用以前的7陶瓷管

  7. 湍流粘滞探针照片

  8. 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，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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