wonho choe fusion plasma transport research center (fptrc)
DESCRIPTION
PPPL Visit. Research Activities in KAIST-FPTRC. February 18, 2014. Wonho CHOE Fusion Plasma Transport Research Center (FPTRC) Korea Advanced Institute of Science and Technology (KAIST). SXR & VUV imaging diagnostics on KSTAR (as of now). Soft X-ray array (SXRA) - PowerPoint PPT PresentationTRANSCRIPT
마스터 부제목 스타일 편집Wonho CHOE Fusion Plasma Transport Research Center (FPTRC)
Korea Advanced Institute of Science and Technology (KAIST)
February 18, 2014
Research Activities in KAIST-FPTRC
PPPL Visit
2SXR & VUV imaging diagnostics on KSTAR (as of now)
Soft X-ray array (SXRA) 2 arrays, 32 ch (64 ch) t = 2 μs, r = 5 cm Ar Ross filters (Cl & Ca K-edge): 2.8 – 4.0 keV Be filters (10, 50 μm: 0.5, 1.0 keV): 2 color
VUV spectroscopy 28 ch for imaging (5 - 20 nm), t = 13 ms 1 ch for survey (15 - 60 nm), t = 13 ms
2-D Tangential X-ray pinhole camera (TXPC) Duplex (2 color), 50x50 ch t = 0.1 ms, r = 2 cm
GEM detector for 2-D X-ray camera 12x12 pixels, 128 ch t = 1 ms, r = 2 - 6 cm 3 – 30 keV
Tomographic reconstruction codes developed Max. Entropy Method Phillips-Tikhonov Min. Fisher Information Cormack
3
edge
0.004
0.006
0.008
0.01
0.012
0.014
0.016
0.018
0.02
HD arrays (33-64)
HU arrays (1-32)
16 ch (32)
16 ch (32)
HU
HD
VD2
VU2
• 4 arrays, 256 ch• 2 cm, 2 μs
1 array, 60 ch
• 2 filters multi energy, neural network
• 1.3 cm, 2 μs
(1) SXR array diagnostic system
4 array, 256 channels
2013 20142 array, 64 ch
• Be filters (10, 50 mm)• Ar Ross filters (Ar trans-
port)• Bolometer (No filter)
S.H. Lee J. Jang
4
(2) Imaging VUV spectroscopy
2013 (5-20 nm, ~3 ms)2012 (15-60 nm, 13-40 ms)
0.004
0.006
0.008
0.01
0.012
0.014
0.016
0.018
0.02
ITER prototype on KSTAR (5 – 60 nm)
Vacuum extension
VUV spectrometer on the optical table
28 ch, imaging
In collaboration with ITER KO-DA (C.R. Seon)
1 ch, survey
He I : 53.70 nmHe II : 25.63, 30.37 nmO V : 15.61, 19.28, 21.50 nmO VI : 17.30, 18.40 nmC III : 38.62 nmC IV : 24.49, 38.41, 41.96 nmC V : 22.72, 24.87 nmFe XV : 28.42 nmFe XVI : 33.54, 36.08 nmW : 5-20 nm
Ar XIV 18.79 nmAr XV 22.11 nmAr XVI 35.39 nm
5
2.50 2.52 2.54 2.56 2.58 2.60 2.62 2.64 2.66 2.68 2.700
100
200
300
400
500
600 r/a = 0.10 r/a = 0.30
Time (s)
X-r
ay p
hoto
n co
unt (
A.U
.)
(a) (b)
Sawtooth crash in #7640
(3) ‘Tangential’ X-ray pinhole cameraIn collaboration with KAERI (M. Moon)
‘Duplex (2-color) Multi-Wire Proportional Counter (MWPC) detector
7640image-81.1s - 81.2s
10 20 30 40 50
5
10
15
20
25
30
35
40
45
50
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
7640image-81.2s - 81.3s
10 20 30 40 50
5
10
15
20
25
30
35
40
45
50
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
(a) (b)
Channel
Cha
nnel
Channel
Outboard Outboard
5 10 15 20 25 30 35 40 45 50
5
10
15
20
25
30
35
40
45
50 -20
-15
-10
-5
0
5
10(b) - (a)
5 10 15 20 25 30 35 40 45 50
5
10
15
20
25
30
35
40
45
50
6
TXPC, RT-EFIT
Major radius, R
Visible camera
Major radius, R
Vloop
Ip
Stored en-ergy
ECE
Da
Shot 7886
Consistent with RT-EFIT and visible camera Tangential reconstruction on-going
X-ray imaging of VDE
S. Jang et al., CAP 13, 819 (2013)
7
Pulse Height Analyzer mode
Te by TXPC (PHA mode)
0 1 2 3 4 5 6 7 8 9 100
1
2
3
Te (A
.U.)
Time (sec)
ECE_2 TXPC_11
40 60 80 100 120 140 160 180 200 220 240 260
0.81.01.21.41.61.82.02.22.42.62.83.0
1 s 2 s 3 s 4 s Linear Fit of 1 Linear Fit of 2 Linear Fit of 3 Linear Fit of 4
# of
pho
tons
(log
_sca
le)
Pulse height (A.U.)
8
(4) GEM detector for TXPC Front Back
128 ch in 12x12 cm2 Spatial & time resolution:
2-6 cm, 1 ms
In collaboration with ENEA (D. Pacella)
55Fe Source
Gas inGas out
Lan cable
HV cable
FPGA
Zoom in & out
GEM
[4] W. Bonivento et al., Nucl. Instr. and Meth. A, 491, 233 (2002)
X-position mov-able
GEM foils: 50 µm thick kapton foil, copper clad on each side
Triple-GEM geometry: 3/1/2/1 mm Front-end electronics: CARIOCA micro chips by
LNF and CERN [4]
Active area: 10 x 10 cm2
Channels: 12 x 12 pixels (each pixel has 0.8 x 0.8 cm2)
Temporal: 10 µs (up to 255 frames), 1 ms (60k frames)
Mixed gas (flow): 70% Ar, and 30% CO2 at 1 atm Movable system
(zoom in & out and horizontally movable)
9
Preliminary result of GEM detectorshot 9033
Zoom inshot 9034 shot 9035 shot 9056
Zoom in & out
10
Time (s)
Freq
uenc
y (k
Hz)
2.632 2.634 2.636 2.638 2.64 2.6420
20
40
60
80
100
Sawtooth crash in H-mode
m = 1 (f = 19 kHz) is shown by spectrogram. Maximum displacement from the initial posi-
tion: 0.13 m Maximum rotation speed: 10.7 km/s
Spectrogramm = 1f = 19 kHz
R (m)
Z (m
)
Time 2.642000 sec
1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
Trajectory of the hot core
rtEFIT
11
2.632 2.634 2.636 2.638 2.64 2.642
0.6
0.8
1
SXR
007
(kW
/m2 )
2.632 2.634 2.636 2.638 2.64 2.6420
0.1
0.2
(m
)
2.632 2.634 2.636 2.638 2.64 2.6420
5
10
15
v (k
m/s)
Time (s)
Comparison between L- & H-mode
1.028 1.03 1.032 1.034 1.0360.2
0.3
SXR
007
(kW
/m2 )
1.028 1.03 1.032 1.034 1.0360
0.1
0.2
(m
)
1.028 1.03 1.032 1.034 1.0360
5
10
15
v (k
m/s)
Time (s)
Crash
< 5 km/s
0.1 m
Crash
< 10 km/s
< 0.1 m
L-mode, low vФ H-mode, high vФ
1.028 1.03 1.032 1.034 1.0360.2
0.3
SXR
007
(kW
/m2 )
1.028 1.03 1.032 1.034 1.0360
0.1
0.2
(m)
1.028 1.03 1.032 1.034 1.0360
5
10
15
v (km
/s)
Time (s)
2.632 2.634 2.636 2.638 2.64 2.642
0.6
0.8
1
SXR
007
(kW
/m2 )
2.632 2.634 2.636 2.638 2.64 2.6420
0.1
0.2
(m)
2.632 2.634 2.636 2.638 2.64 2.6420
5
10
15
v (km
/s)
Time (s)
Crash in multi steps
Crash in a single step
Displacement from central position
Displacement from central position
Poloidal velocity Poloidal velocity
12Correlation between SXR rotation speed & vФ (XICS)
50 100 150 200 2500
5
10
15
20
25
Toroidal Rotation Velocity [km s-1]
Freq
uenc
y (m
= 1
) [kH
z]
#7640#7642#7644#7645#7646#7647
• The m=1 SXR rotation speed is compared with toroidal rotation speed (XICS).• Toroidal rotation frequency
0 5 10 15 20 250
5
10
15
20
25
Rotation Frequency [kHz]
Freq
uenc
y (m
= 1
) [kH
z]
#7640#7642#7644#7645#7646#7647
Rf
2
13
ECH effect on Ar transport Argon gas injection through a piezo valve (nAr/ne < 0.1%)
Different transport with varying ECH positions Feasibility of impurity control? Analysis of Ar transport coefficients in L-mode (#7566, #7574) & H-mode (#7745, #7863)
by using UTC-SANCO code with diagnostic results (SXR, VUV, XICS)
0.4
0.2
0 1 2 3 4 Time (sec)
Ip (M
A)
Ar puffing20 ms
#756
6 0.4
0.2
0 1 2 3 4 Time (sec)
Ip (M
A)
Ar puffing20 ms
#757
4
ECH110 GHz350 kW
#786
3
L-mode
w/o ECH
R [m]
Z [m
]
1.2 1.4 1.6 1.8 2 2.2 2.4
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
Heating positions(r/a = 0, 0.16, 0.30, 0.59)
w/ ECH
40 cm20100
Ar puffing after ECH start
Ar
14
1.8 1.9 2 2.1 2.2 2.3-10
0
10
20
30
40
50
60
70
80
Time [s]
P SXR [W
m
-2]
No ECHOn-axis ECH = 0.16 = 0.30 = 0.59
Depending on ECH position
Time (s)
400
mm
20
0 m
m
100
mm
O
n-ax
is
No
ECH
Chor
d #
1.5 2 2.5 3 3.5
1
161
161
161
161
16
No ECH
On-axis ECH
ECH @r/a = 0.16
0.30
0.59
Less core accumulation of Ar impurity with ECHMost effective (i.e., least core impurity concentration) with on-axis ECHLess effective with resonance layer position at larger radius
No ECH
On-axis ECH
0.16
0.30
r/a = 0.59
L-mode
15
2-D Reconstructed Ar emissivity• Core-focused reconstruction (Cormack algorithm)• Emissivity images of mainly Ar16+ & Ar17+ impurities
No ECH On-axis ECH
1.4 1.6 1.8 2 2.20
0.1
0.2
0.3
R (m)
I SXR (k
W/m
3 )
0.04
0.06
0.08
P SXR (k
W/m
3 )
SXR004
0.1
0.15
0.2
P SXR (k
W/m
3 )
SXR007
0.1
0.15
0.2
P SXR (k
W/m
3 )
SXR010
0.01
0.02
0.03
0.04
0.05
P SXR (k
W/m
3 )
SXR019
2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3
0.1
0.15
0.2
0.25
Time (s)
P SXR (k
W/m
3 )
SXR024
Shot #7566, Time: 2.240000 s
1.4 1.6 1.8 2 2.20
0.1
0.2
R (m)
I SXR (
kW/m
3 )
0.04
0.06
0.08
0.1
P SXR (
kW/m
3 )
SXR004
0.1
0.15
0.2
0.25
P SXR (
kW/m
3 )
SXR007
0.1
0.15
0.2
0.25
P SXR (
kW/m
3 )
SXR010
0.02
0.04
0.06
P SXR (
kW/m
3 )
SXR019
2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 30.1
0.15
0.2
0.25
Time (s)
P SXR (
kW/m
3 )
SXR024
Shot #7574, Time: 2.194000 s
1.41.6
1.82
2.2
-0.5
0
0.5
0
0.05
0.1
0.15
0.2
0.25
R (m)Z (m)
PSX
R (k
W/m
3 )
1.41.6
1.82
2.2
-0.5
0
0.5
0
0.05
0.1
0.15
0.2
0.25
R (m)Z (m)
PSX
R (kW
/m3 )
16
• With ECH, central diffusion and convection are increased.• The pinch direction reverses at r/a < 0.3.
Modification of D & V by ECH
0 0.2 0.4 0.6 0.8 10.1
0.2
0.3
0.4
0.5
Diff
usio
n (m
2 /s)
r/a0 0.2 0.4 0.6 0.8 1
-15
-10
-5
0
Con
vect
ion
(m/s
)
r/a
0 0.2 0.4 0.6 0.8 10.1
0.2
0.3
0.4
0.5
Diff
usio
n (m
2 /s)
r/a0 0.2 0.4 0.6 0.8 1
-15
-10
-5
0
5
Con
vect
ion
(m/s
)
r/a
Non ECH (#7566)
On-axis ECH (#7574)
Outward Inward
Inward
17
0 0.2 0.4 0.6 0.8 10
0.5
1
1.5
2
2.5
3
3.5
4
4.5x 10
16
#/m
3
r/a
No ECH
Total ArAr+17
Ar+16
0 0.2 0.4 0.6 0.8 10
2
4
6
8
10
12
14
16x 10
15
#/m
3
r/a
On-axis ECH
Total ArAr+17
Ar+16
◈ Radial profile of total Ar density at peak time (2.3 s)
◈ Total Ar density
r/a
Tim
e (s
)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.82.05
2.1
2.15
2.2
2.25
2.3
1
2
3
4x 1016
r/a
Tim
e (s
)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.82.05
2.1
2.15
2.2
2.25
2.3
0
2
4
6
8
10
12
14
16x 10
15No ECH (#7566) On-axis ECH (#7574)
Total Ar Total Ar
Hollow Ar density profile by ECH
18
Neoclassical contribution of Ar transport
No ECH (#7566)
On-axis ECH (#7574)
0 0.1 0.2 0.3 0.4 0.50
0.1
0.2
0.3
0.4
0.5
Diff
usio
n (m
2 /s)
r/a
0 0.1 0.2 0.3 0.4 0.5-15
-10
-5
0
5
Con
vect
ion
(m/s
)
r/a
0 0.1 0.2 0.3 0.4 0.50
0.1
0.2
0.3
0.4
0.5
Diff
usio
n (m
2 /s)
r/a
0 0.1 0.2 0.3 0.4 0.5-10
-5
0
5
Con
vect
ion
(m/s
)r/a
0 0.1 0.2 0.3 0.4 0.5
7
8
9
10x 10
-3
Diff
usio
n (m
2 /s)
r/a
0 0.1 0.2 0.3 0.4 0.5-0.1
-0.05
0
0.05
0.1
0.15
Con
vect
ion
(m/s
)
r/a
Neoclassical calculation of D and V by NCLASS - The same input (Te, ne) of SANCO calculation - Ar16+ (dominant charge state) distribution at the peak time is used.
D, V calculated by NLCASS is smaller by an order of magnitude than the experimental D, V.
The impurity transport is anomalous, rather than neoclassical.
NCLASS
Exp
19Impurity pinch 3 impurity pinch terms[1] in Weiland multi-fluid model
Pinch type Description Pinch directionby turbulence type
Curvature pinch Compressibility of ExB drift v Inward
Thermodiffusion pinch Compression of the diamagnetic drift v ITG OutwardTEM Inward
Parallel impurity compression
Parallel compression of parallel v fluctuations produced along the field line by fluctuating
electrostatic potential
ITG InwardTEM Outward
GYRO and XGC simulations are on-going to find the dominant turbulence mode of No ECH and on-axis ECH cases.
It is expected that TEM is the dominant mode because of ECH effect on Te profile. It may be due to parallel impurity compression driven by increased R/LTe
[2]
[1] H. Nordman et al., 2011 Plasma Phys. Control. Fusion 53 105005 [2] C. Angioni et al.,2006 Phys. Rev. Lett. 96 095003
Curvature pinch
Thermodiffusion pinch
Parallel compression
pinch
20Diagnostics & analysis tools ready for W injection experiment
5 - 20 nm wavelength range is mainly used for measurement of W emission spectra. ASDEX-U: VUV (~5 nm) JET: VUV (~5 nm) & SXR JT-60U: VUV (6.23 nm) LHD: EUV (6.09, 6.23 & 12.7 nm) KSTAR
- VUV (5 – 60 nm): ITER prototype- SXR
Simulation & Atomic data: SANCO-ADAS
W test particle injector under preparation/consideration Particle gun (under preparation on KSTAR) Laser blow-off system (C-Mod) Particle dropper (NSTX) Pellet injection (LHD)
21
Presentations and discussionsDesign and tomography test of Soft X-ray Array diagnostics
on KSTAR (Seung Hun LEE)
Design and tomography test of Edge Multi energy Soft X-ray Array diagnostics on KSTAR (Juhyeok JANG)
Impurity transport analysis and preparation of W injection experiments (Joohwan HONG)
Development of a tungsten injection injector for high Z impurity study (Joohwan HONG)