Transcript Document 7732613

Experiments on Fusion relevant
devices
G. Popa, C. Costin, M. L. Solomon, V. Anita,
L. Sirghi, C. Lupu, S. Teodoru, C. Agheorghiesei
Faculty of Physics, “Al. I. Cuza” University
Association EURATOM-MEdC, Iasi, Romania
Main objective
Investigations on edge plasmas
Castor Tokamak
(IPP Prague)
electrical methods
Pilot-PSI
(FOM)
plasma parameters
essential data
Dust generation
Erosion, transport
and deposition of
low-Z wall materials
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
PWI Task Force
Fuel retention
Main objective
Plasma parameters (Vp, Ti, I0i)
• Plasma-wall energy transfer (heat load)
• Plasma-wall particle transfer (particle fluxes)
• Wall/divertor erosion
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Collaborations
J. Stöckel, J. Adamek, M. Kocan, J. Brotankova
Institute of Plasma Physics
Association EURATOM-IPP.CZ, Prague, Czech Republic
R. S. Al, B. de Groot, W. Goedheer, N. J. Lopes Cardozo,
H. J. van der Meiden, G. J. van Rooij, J. Westerhout, J. Rapp
FOM-Institute for Plasma Physics Rijnhuizen
Association EURATOM-FOM, Nieuwegein, The Netherlands
R. Schrittwieser, C. Ionita, R. Stärz, S. Kuhn, D. Tskhakaya jr.
Theoretical Plasma Physics Group & Department for Ion Physics
Association EURATOM-ÖAW, Innsbruck University, Austria
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Castor Tokamak
•
•
•
•
R = 40 cm
a = 8.5 cm
B = 1.2 T
Ip =10 kA
• background pressure
< 10−4 Pa
• operating H2 pressure
~ 10−2 Pa
• t ~ 30 ms
• <ne> ~ 1019 m−3
• ne ~ 1018 m−3 in SOL
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Castor Tokamak
Plasma potential measurements
Katsumata probe schematic representation
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Castor Tokamak
Plasma potential measurements
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Castor Tokamak
Ion temperature measurements
-Collector and screening tube biased
between -100 V and +100 V, around
a DC offset, at 300 Hz.
-Two different collector positions,
h = -0.5, -0.3 mm.
Typical I-V characteristic of the collector
(h = -0.5 mm, r = 80 mm)
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Castor Tokamak
Ion temperature measurements
Radial profile of ion temperature for
collector positions h = -0.5 and -0.3 mm
Ion temperature measured with
Katsumata and Tunnel probe
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Castor Tokamak
Diffusion coefficient measurements
Power spectra fluctuations for different collector position h [mm] (r = 65 mm)
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Castor Tokamak
Diffusion coefficient measurements
Radial decay of spectrum
at 10 different frequencies
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
D 1
f 
4 L2
Castor Tokamak
Diffusion coefficient measurements
Measured diffusion coefficient
Bohm diffusion coefficient (x 3.5)
- black points
- red line
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Pilot - PSI
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Pilot - PSI
Gas
Ar, Ar + H2, H2
Gas flow
1…2 slm
1 slm ~ 4.48×1020 molec/s
Source current
IS = 80…150 A
Gas pressure
p = 1…5 Pa
Magnetic field strength
B = 0.4…1.2 T
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Pilot - PSI
B=0T
B = 0.4 T
Ar
H2
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
H2 + Ar
H2
Pilot - PSI
Plasma potential radial profile
- emissive and cold probes
0
(a)
Floating potential (V)
Floating potential (V)
H2
0
B = 0.4 T
-10
cold probe
heated probe
-5
B=0.030T
B=0.045T
B=0.060T
B=0.075T
B=0.090T
B=0.100T
-10
-15
-20
0
5
10
15
20
0
r (mm)
H2: Id = 120 A, p = 1.6 Pa
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
5
10
r (mm)
15
20
Pilot - PSI
Argon
6
0
4
Hydrogen
Vf (V)
Vf (V)
-10
2
-20
IS = 80 A, B = 0.4 T
IS = 100 A, B = 0.4 T
IS = 120 A, B = 0.4 T
IS = 80 A, B = 0.8 T
IS = 100 A, B = 0.8 T
IS = 120 A, B = 0.8 T
0
IS = 80 A, B = 0,4 T
IS = 100 A, B = 0,4 T
IS = 120 A, B = 0,4 T
IS = 80 A, B = 0,8 T
IS = 100 A, B = 0,8 T
IS = 120 A, B = 0,8 T
-30
-2
-40
0
1
2
r (cm)
3
4
5
0
1
2
3
4
5
r (cm)
1.00
0.20
Argon
Hydrogen
0.75
Isi (A)
Isi (A)
0.15
0.50
IS = 80 A, B = 0,4 T
IS = 100 A, B = 0,4 T
IS = 120 A, B = 0,4 T
IS = 80 A, B = 0,8 T
IS = 100 A, B = 0,8 T
IS = 120 A, B = 0,8 T
0.25
IS = 80 A, B = 0,4 T
IS = 100 A, B = 0,4 T
IS = 120 A, B = 0,4 T
IS = 80 A, B = 0,8 T
IS = 100 A, B = 0,8 T
IS = 120 A, B = 0,8 T
0.10
0.05
0.00
0.00
0
1
2
3
r (cm)
4
5
0
1
Ar and H2: p = 3.1 Pa, Qv = 2 slm
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
2
3
r (cm)
4
5
Pilot - PSI
Azimuthal drifts
Electric drift
Diamagnetic drift
vE 
EB
B2
vn 
vE 
Er
B
vn 
Er   rV f
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
kT n  B
e nB 2
kT  r n

eB n
 r n  r I SI

n
I SI
Pilot - PSI
Azimuthal drifts
0
(a)
H
E/B (km/s)
2
-10
B=0.030T
B=0.045T
B=0.060T
B=0.075T
B=0.090T
B=0.100T
-20
0
5
vE 
10
r (mm)
15
EB
1
B 2 1   i / ci 2
OES
20
Measurements of Hα line
(neutrals rotation)
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Pilot - PSI
Multi-Channel Analyzer (MCA)
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Pilot - PSI
Multi-Channel Analyzer (MCA)
400
ch 100
ch 200
ch 301
ch 404
300
60
Icollector (mA)
Icollector (mA)
Argon
B = 0.4T
200
100
ch 000
ch 100
ch 200
ch 301
ch 404
Hydrogen
B = 0,4T
40
20
0
0
-40
-30
-20
-10
0
10
20
30
40
-80
-60
Vcollector (V)
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
-40
-20
0
Vcollector (V)
20
40
60
Pilot - PSI
Multi-Channel Analyzer (MCA)
Argon
B=0.4T
Vcollector = -25V
23
Vcollector = -65V
4x10
Vcollector = -35V
Vcollector = -70V
Ion flux (ions/m2s)
Ion flux (ions/m2s)
1x10
Vcollector = -60V
22
Vcollector = -30V
22
8x10
22
6x10
22
3x10
Hydrogen
B = 0.4 T
22
2x10
22
4x10
22
1x10
0
2
4
6
8
10
0
r (mm)
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
2
4
6
r (mm)
8
10
Conclusions
 Plasma diagnostic experiments on Castor Tokamak and Pilot-PSI
 Multi channel analyzer, electrostatic probes: cold (Langmuir),
emissive, Katzumata
 Measurements of plasma parameters: plasma potential, ion
temperature, ion flux, plasma diffusion coefficient
Essential data for PWI
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Conclusions
Communicated results (2005-2009)
ISI Articles
Conferences
Workshops
5
11
5
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Future plans
COMPASS tokamak – IPP ASCR, Prague
Major radius
Minor radius
Plasma current
Magnetic field
Pulse length
56 cm
20 cm
< 350 kA
0.8 – 2.1 T
<1s
December 9, 2008 – first plasma
February 19, 2009 – official start of tokamak operation
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Future plans
Magnum-PSI – FOM, The Netherlands
Pulse duration
steady-state operation
Magnetic field
3 T, variable
Beam diameter
10 cm, variable
Pressure at target
3 Pa
Plasma heating
up to 3 eV (Ohmic + Helicon wave)
Particle flux density
up to 1024 hydrogen ions m-2s-1
Energy flux density
up to 10 MW/m2
Surface analysis
in situ
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania
Future plans
FUSENET - The European Fusion Education Network
 Purpose:
increase, enhance, and broaden fusion training
and education activities in Europe
 48 months, started the 1st of October 2008
 Total budget of 2,000 k€
 36 participants from 18 countries
• 22 Universities
• 14 Euratom Associations
5th EURATOM / MEdC Association Days Meeting, November 26-27, 2009, Magurele, Romania