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

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 ECE radiometer on HT-7 tokamak

  • 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


  • Method ECE radiometer on HT-7 tokamak 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


Introduction ECE radiometer on HT-7 tokamak

  • 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


ECE measurement on JT-60U ECE radiometer on HT-7 tokamak

  • 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

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ECE measurement on TFTR ECE radiometer on HT-7 tokamak

Nagayama et al. Phys. Plasmas 3, 7, 1996


Different island result on TFTR ECE radiometer on HT-7 tokamak

Nagayama et al. Phys. Plasmas 3, 7, 1996


  • Method ECE radiometer on HT-7 tokamak 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


HT-7 tokamak ECE radiometer on HT-7 tokamak

Major radius: R=1.22m

Minor radius: a=0.27m

Limiter: Mo & liquid Li

Heating: Lower hybrid wave and ICRF


Multi-channel ECE on HT-7 tokamak ECE radiometer 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


  • Method ECE radiometer on HT-7 tokamak 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


signals for shot 112810 ECE radiometer on HT-7 tokamak

ECEoscillation phase inverse

Mirnov coils oscillation


ECE oscillation analysis for shot112810 ECE radiometer on HT-7 tokamak

  • oscillation phase inverse

  • oscillation frequency: 3.5kHz

  • amplitude ~ 10%


Mirnov coils signals for Shot112810 ECE radiometer on HT-7 tokamak

poloidal:12 coils, fixed among 30°

measuring the poloidal

mode

toroidal:9 coils, asymmetrical

measuring the toroidal

mode

m=2

n=1


Two moments analysis for Shot112810 ECE radiometer on HT-7 tokamak

time: 515.066 0.02ms

time: 536.617 0.02ms


  • Method ECE radiometer on HT-7 tokamak 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


  • 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.


Thank you ECE diagnostic on HT-7 !

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