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

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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


Measurement of magnetic island width by using multi channel ece radiometer on ht 7 tokamak

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


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

  • Summary of this work


Measurement of magnetic island width by using multi channel ece radiometer on ht 7 tokamak

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


Measurement of magnetic island width by using multi channel ece radiometer on ht 7 tokamak

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

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Measurement of magnetic island width by using multi channel ece radiometer on ht 7 tokamak

ECE measurement on TFTR

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


Measurement of magnetic island width by using multi channel ece radiometer on ht 7 tokamak

Different island result on TFTR

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


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

  • Summary of this work


Measurement of magnetic island width by using multi channel ece radiometer on ht 7 tokamak

HT-7 tokamak

Major radius: R=1.22m

Minor radius: a=0.27m

Limiter: Mo & liquid Li

Heating: Lower hybrid wave and ICRF


Measurement of magnetic island width by using multi channel ece radiometer on ht 7 tokamak

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


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

  • Summary of this work


Measurement of magnetic island width by using multi channel ece radiometer on ht 7 tokamak

signals for shot 112810

ECEoscillation phase inverse

Mirnov coils oscillation


Measurement of magnetic island width by using multi channel ece radiometer on ht 7 tokamak

ECE oscillation analysis for shot112810

  • oscillation phase inverse

  • oscillation frequency: 3.5kHz

  • amplitude ~ 10%


Measurement of magnetic island width by using multi channel ece radiometer on ht 7 tokamak

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


Measurement of magnetic island width by using multi channel ece radiometer on ht 7 tokamak

Two moments analysis for Shot112810

time: 515.066 0.02ms

time: 536.617 0.02ms


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

  • Summary of this work


Measurement of magnetic island width by using multi channel ece radiometer on ht 7 tokamak

  • 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.


Measurement of magnetic island width by using multi channel ece radiometer on ht 7 tokamak

Thank you!

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