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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. 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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slide1

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

slide2

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
slide3

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
slide4

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
slide5

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

slide6

ECE measurement on TFTR

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

slide7

Different island result on TFTR

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

slide8

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
slide9

HT-7 tokamak

Major radius: R=1.22m

Minor radius: a=0.27m

Limiter: Mo & liquid Li

Heating: Lower hybrid wave and ICRF

slide10

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

slide11

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
slide12

signals for shot 112810

ECEoscillation phase inverse

Mirnov coils oscillation

slide13

ECE oscillation analysis for shot112810

  • oscillation phase inverse
  • oscillation frequency: 3.5kHz
  • amplitude ~ 10%
slide14

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

slide15

Two moments analysis for Shot112810

time: 515.066 0.02ms

time: 536.617 0.02ms

slide16

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
slide17

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.
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