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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 - PowerPoint PPT Presentation
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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
1/18
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
2/18
• 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
3/18
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
4/18
A. Isayama et al. plasma phys. Control fusion 41 (1999) 35-43
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 atR=3.65m
7widthR cm
e eT T
5/18
2
2
1 t T
t Tf t f t f t dt
T
Nagayama et al. Phys. Plasmas 3, 7, 1996
ECE measurement on TFTR
6/18
Nagayama et al. Phys. Plasmas 3, 7, 1996
Different island result on TFTR
7/18
• 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
8/18
Major radius: R=1.22mMinor radius: a=0.27mLimiter: Mo & liquid LiHeating: Lower hybrid wave and ICRF
1.5 2.2
100 250T
P
B T
I kA
HT-7 tokamak
9/18
•Horizontal distribution along middle plane•Spatial resolution: 2cm•2nd harmonic frequency: 98.5~126GHz•Channel location with frequency: 0 0 1eB R
Rm f
( / ) 1/n ce en n eB m B R 2
3 2( )
8 eI Tc
Multi-channel ECE on HT-7 tokamak
Heterodyne radiometer ECE diagnostic 10/18
• 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
11/18
ECE oscillation phase inverse
Mirnov coils oscillation
signals for shot 112810
19 3
100
1.75
2.4 10
p
t
e
I kA
B T
n cm
12/18
ECE oscillation analysis for shot112810
frequency(GHz)
ECE0198.501
ECE02100.433
ECE03102.366
ECE04104.299
ECE05106.232
ECE06108.165
ECE08112.031
ECE10114
Location (m)
1.2171 1.1937 1.1711 1.1494 1.1285 1.1083 1.0701 1.0516
• oscillation phase inverse
0.06w m
1.12R m
• oscillation frequency: 3.5kHz• amplitude ~ 10%
13/18
poloidal : 12 coils, fixed among 30° measuring the poloidal mode
toroidal : 9 coils, asymmetrical measuring the toroidal mode
Mirnov coils signals for Shot112810
m=2
n=1
4.2aq
14/18
time: 515.066 0.02ms time: 536.617 0.02ms
5w cm4w cm
Two moments analysis for Shot112810
15/18
• 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
16/18
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.
17/18
satw
0.16satw a
Thank you!
18/18