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ECEI 测量 Te 及其涨落

ECEI 测量 Te 及其涨落. 王俊，徐小园，俞昌旋，闻一之 中国科学技术大学 wangjun@mail.ustc.edu.cn. B. 电子回旋辐射 (ECE) 原理. 带电粒子在洛仑兹力的作用下作回旋运动 电子回旋共振层辐射出电磁波 w n = n w ce , w ce (R) µ B µ 1/R 光学厚的情况下，辐射正比于电子温度. 一维 ECER 诊断. 电子回旋辐射强度正比于电子温度 采用单个天线沿主半径方向接收辐射 通过分频产生多个通道获得电子温度分布. ECEI 诊断原理.  采用低成本的垂直排列的微带天线 / 混频阵列

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ECEI 测量 Te 及其涨落

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  1. ECEI测量Te及其涨落 王俊，徐小园，俞昌旋，闻一之 中国科学技术大学 wangjun@mail.ustc.edu.cn

  2. B 电子回旋辐射(ECE)原理 • 带电粒子在洛仑兹力的作用下作回旋运动 • 电子回旋共振层辐射出电磁波 • wn =nwce , • wce(R) µB µ1/R • 光学厚的情况下，辐射正比于电子温度

  3. 一维ECER诊断 • 电子回旋辐射强度正比于电子温度 • 采用单个天线沿主半径方向接收辐射 • 通过分频产生多个通道获得电子温度分布

  4. ECEI诊断原理 采用低成本的垂直排列的微带天线/混频阵列  在会聚处测量，提高空间分辨  二维测量，能同时对极向和径向进行相关测量 1995年，B.H.Deng和N.C.Luhmann等人发展了ECEI诊断技术，成功地把横向分辨率提高到了1cm，并将其应用到了TEXT-U和RTP上

  5. TEXTOR-94上用ECEI获得的电子温度剖面 R=1.75m, a=0.46m, B<2.9T, N~1.5x1013cm-3

  6. TEXT-U上磁岛结构 G.Cima,etc,Plasma Phys. Control. Fusion, 40, 1149(1998) 反转直径是16cm，图像对应宽度20cm

  7. RTP上的二维MHD涨落 2D image of MHD fluctuation amplitudes measured at 60 kA, 1.51019 m-3. [ B.H. Deng, et al.,Phys. Plasmas 8, no. 5, pp. 2163-2169, 2001. ]

  8. TEXT-U上的Te涨落的功率谱和统计色散关系 • B.H. Deng, et al., Phys. Plasmas 5, 4117 (1998)  Cross power spectral density (a) and statistical dispersion relation (b) measured at r/a=0.61 (200 kA, 21019 m-3).  Consistent with drift wave theory [W. Horton, Jr., Phys. Fluids 19, 711 (1976)] and previous FIR scattering measurements [D.L. Brower, Nucl. Fusion, 27, 2055 (1987); Phys. Fluids B4, 381 (1992)].

  9. RTP上Te涨落的功率谱密度和统计色散关系 Two modes are distinguished from the measured cross power spectral density and cross phases between two vertically separated channels. The error bars denote the standard deviation over multiple realizations. The average of the cross correlation function has been subtracted.

  10. Ht7 ECEI系统参数 • 接收频率97.5GHz • IF Bandwidth: 25~297MHz DBS • Video Bandwidth: 1MHz • 垂直16道，道间距约9mm

  11. 频谱范围

  12. 光学厚的计算 M. Bornatici, Plasma Physics,Vol.24,No.6,629(1982). R0=122cm，a=27cm，B0=1.95T，ne0=2.0x1013cm-3时， 诊断区域为-0.62<r/a<0.58，即-17cm<r<16cm

  13. 97.5GHzECEI接收系统径向诊断位置

  14. ECEI诊断垂直道校准实验 • 在平稳欧姆放电情况下，BT＝1.93T（此时97.5GHz的诊断位置对应于r=13cm)，控制等离子体中心垂直缓慢移动(约在0.05cm/ms的量级)>4cm的距离。

  15. 测量约束区域的Te及其涨落的二维分布 在平稳欧姆放电的情况下，Ip＝150kA，ne＝2x1013cm-3，进行磁场扫描: BT=1.88,1.90,1.92,1.94,1.96,1.98, 2.00T, 对应于径向位置 r=9.6, 11.0, 12.4, 13.8, 15.2, 16.6, 18.0cm

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