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Measurement of magnetic island width by using multi-channel ECE radiometer on HT-7 tokamak

Measurement of magnetic island width by using multi-channel ECE radiometer on HT-7 tokamak. Han Xiang( 韩翔 ), Ling Bili( 凌必利 ), Gao Xiang( 高翔 ), Liu Yong( 刘永 ), Ti Ang ( 提昂 ), Wang Yumin( 王嵎民 ) July 19 2011. Outline. Method to evaluate the magnetic island width by ECE

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Measurement of magnetic island width by using multi-channel ECE radiometer on HT-7 tokamak

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  1. Measurement of magnetic island width by using multi-channel ECE radiometer on HT-7 tokamak Han Xiang(韩翔), Ling Bili(凌必利), Gao Xiang(高翔), Liu Yong(刘永), Ti Ang (提昂), Wang Yumin(王嵎民) July 19 2011

  2. Outline • Method to evaluate the magnetic island width by ECE • specifications of HT-7 tokamak and multi-channel ECE heterodyne radiometer • Measurement of magnetic island of electron temperature on HT-7 • Summary of this work

  3. Method to evaluate the magnetic island width by ECE • specifications of HT-7 tokamak and multi-channel ECE heterodyne radiometer • Measurement of magnetic island from ECE on HT-7 • Summary of this work

  4. Introduction • The magnetic island can degrade the plasma confinement or even lead to a disruption • Such kind of destabilization is thought to be caused by the local loss of bootstrap current • It’s key issues that the magnetic island suppression for experimental tokamak or commercial reactors such as ITER • Electron cyclotron emission (ECE) as an primary diagnostic could be applied for magnetic island research

  5. ECE measurement on JT-60U • Te profile for island width and its evolution • ECE oscillation contour for island width, rotation frequency, the inverted phase and so on Inverted phase at R=3.65m A. Isayama et al. plasma phys. Control fusion 41 (1999) 35-43 5/18

  6. ECE measurement on TFTR Nagayama et al. Phys. Plasmas 3, 7, 1996

  7. Different island result on TFTR Nagayama et al. Phys. Plasmas 3, 7, 1996

  8. Method to evaluate the magnetic island width by ECE • specifications of HT-7 tokamak and multi-channel ECE heterodyne radiometer • Measurement of magnetic island from ECE on HT-7 • Summary of this work

  9. HT-7 tokamak Major radius: R=1.22m Minor radius: a=0.27m Limiter: Mo & liquid Li Heating: Lower hybrid wave and ICRF

  10. Multi-channel ECE on HT-7 tokamak • Horizontal distribution along middle plane • Spatial resolution: 2cm • 2nd harmonic frequency: 98.5~126GHz • Channel location with frequency： Heterodyne radiometer ECE diagnostic

  11. Method to evaluate the magnetic island width by ECE • specifications of HT-7 tokamak and multi-channel ECE heterodyne radiometer • Measurement of magnetic island from ECE on HT-7 • Summary of this work

  12. signals for shot 112810 ECEoscillation phase inverse Mirnov coils oscillation

  13. ECE oscillation analysis for shot112810 • oscillation phase inverse • oscillation frequency: 3.5kHz • amplitude ~ 10%

  14. Mirnov coils signals for Shot112810 poloidal：12 coils, fixed among 30° measuring the poloidal mode toroidal：9 coils, asymmetrical measuring the toroidal mode m=2 n=1

  15. Two moments analysis for Shot112810 time: 515.066 0.02ms time: 536.617 0.02ms

  16. Method to evaluate the magnetic island width by ECE • specifications of HT-7 tokamak and multi-channel ECE heterodyne radiometer • Measurement of magnetic island from ECE on HT-7 • Summary of this work

  17. The magnetic island width of m/n=2/1 mode is evaluated using ECE diagnostic on HT-7 • Saturated island width of 2/1 mode is about 5cm, • ; island rotation frequency is 3.5kHz. • The island information can be obtained by ECE diagnostic. This method is useful for the research of NTM on EAST experiment in the future.

  18. Thank you！ 18/18

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