Transcript Magnum-PSI Status and planned plasma heating

FOM-Institute for Plasma Physics Rijnhuizen
Association Euratom-FOM
PSI spectroscopy of hydrocarbons
and erosion in Pilot-PSI
Gerard van Rooij
Pilot & Magnum team:
J. Westerhout, W.A.J. Vijvers, R.S. Al, H.J.N. van Eck, B. de Groot, W.R. Koppers,
H.J. van der Meiden, P.R. Prins, M.J. van de Pol, P.H.M. Smeets, J. Scholten,
W.J. Goedheer, A.W. Kleyn, N.J. Lopes Cardozo
S. Brezinsek, FZJ Jülich
R. Engeln, D.C. Schram, Eindhoven University of Technology
D.G. Whyte, MIT
Pilot-PSI: experimental
Coils
0.55 m
Arc
Spectroscopy
Coils
Target
Arc
Thomson
Scattering
Spectroscopy
Thomson
Scattering
cathode
H2
plasma
anode
2
Density and temperature near the target
532nm
2.0
Te (eV)
Thomson Scattering
at 17 mm from target
1.5
1.0
0.5
0.0
17 mm
B-field:
1.6 T
1.2 T
0.8 T
0.4 T
1.5
Scattered light
analyzed spectrally
and spatially resolved
21
-3
ne (10 m )
2.0
1.0
0.5
0.0
-10
-5
0
5
radial position (mm)
10
3
Parameter range at target realized in Pilot
5
>1023 H+/m2s
>1024 H+/m2s
Gion = 0.6· ne· cs,i(Te)
>1025 H+/m2s
Electron Temperature (eV)
4
3
Experimental knobs:
•Source current & flow
2
•Vessel pressure
1
•Magnetic field
0
19
10
2
3
4 5 6
20
10
2
3
4 5 6
21
10
2
3
4 5 6
22
10
•Target potential
-3
Electron Density (m )
4
Target calorimetry confirms flux from ne,Te
Measured in target cooling water: 1.0 kW
 this is 10 MW/m2 !
1.5
25
+
2
flux density (10 H /m s)
100 s exposure
= 1027 H+/m2 !!!
1.0
0.5
0.0
0
2
4
6
radius (mm)
8
10
Integration of flux profile for B = 0.4 T gives total Gion:
Gion= 3.2·1020 H+/s
 this is 40% of input gas flow!
Flux corresponds to 1.0 kW power
(assuming Eion+Ediss+5/2 k(Te+Ti) )
5
Exposure of carbon to 1026 H+/m2
•
•
•
•
•
Target 5mm x 30mm, fine grain, Carbon SGL Group, R 6650
Power to target cooling water: 0.9 kW
Thomson scattering: ne = 9±1·1019, Te = 4.0 ± 0.2 eV
100 sec exposure time
Target grounded: 50 A net current
Auger spectroscopy shows
no target contamination
IR spectrum indicates no
excessive surface temp.
Eroded crater < 5 mm;
agrees with Ychem and
no redeposition (~4 mm)
6
Ychem from spectroscopy
G
Y
=
chem
GHD
chem
C
target
G

t
(ADAS)
(Hydkin)
spectrometer
Hg
420
425
430
Hd
400
410
420
CH
430
440
450
wavelength (nm)
7
Pilot exposures compared to the Ychem curve
To be considered:
Calibration required by CH4 puffing
Surface temperature unknown
8
Conclusions
Pilot-PSI offers >1026 H+/m2 exposures at
ne up to 2·1021 m-3 and Te up to 4 eV
First Ychem determinations based on
spectroscopy demonstrated for
>1024 H+/m2s; in line with literature
9