k. krieger, sewg meeting on material migration and iter material mix, jet, 07.07.2009...
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K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Max-Planck-Institutfür Plasmaphysik
Carbon local transport and redeposition -Results from 13C gas puffing
in the outer divertor of ASDEX Upgrade
K. Krieger, L. Aho-Mantila, M. Airila, A. Hakola, R. Pugno
Association EURATOM Max-Planck Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Outline
Analysis methods
2007 #22573-22585 L-mode D2, -2.5T, 0.8MA
2008 #23646-23654 L-mode H2, 2.5T, -0.8MA
2008 #24183-24189 L-mode D2, -2.5T, 0.8MA
Modelling using B2/EIRENE + ERO
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Puff trace amounts of 13CD4 in series of similar discharges and
measure local 13C deposition 2D-distribution at retrieved tiles.
Benchmark data for ERO and for spectroscopic CD flux measurements.
Example: 13CH4 local injection in ASDEX Upgrade
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Quantitative analysis of low-Z element deposition
SIMS: Allows to derive depth profilesDifficult to obtain absolute calibration and depth scale
NRA: Allows to derive total amountDifficult to obtain depth profiles
Colorimetry: Allows to derive lateral distribution with high resolutionOnly possible for transparent layers with uniformoptical constantsNo isotope sensitivity
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
NRA of low-Z elements: D, 10B, 11B, 12C, 13C, 16O
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Outline
Analysis methods
2007 #22573-22585 L-mode D2, -2.5T, 0.8MA
2008 #23646-23654 L-mode H2, 2.5T, -0.8MA
2008 #24183-24189 L-mode D2, -2.5T, 0.8MA
Modelling using B2/EIRENE + ERO
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Configuration and plasma parameters
11 L-mode discharges
13CH4 puff 1.6−4.6 s
2 Valves
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Tiles after exposure
1.5°
1.5°
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
NRA results
Total injected 13CH4 molecules = 1.2×1020 (upper) = 2.0×1020 (lower)
Total deposited 13C integrated over tiles = 1.1×1020 (upper) = 1.8×1020 (lower)
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
NRA results
100% local redeposition different toroidal decay lengths upstream/downstream, upper/lower valve downward poloidal shift 40% of injected 13C deposited upstream
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Outline
Analysis methods
2007 #22573-22585 L-mode D2, -2.5T, 0.8MA
2008 #23646-23654 L-mode H2, 2.5T, -0.8MA
2008 #24183-24189 L-mode D2, -2.5T, 0.8MA
Modelling using B2/EIRENE + ERO
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Configuration and plasma parameters
3 L-mode discharges
13CH4 puff 1.6−4.3 s
2 Valves
Reversed Bt, Ip
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Tile after exposure
1.5°
1.5°
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
NRA results
Total injected 13CH4 molecules = ?
Total deposited 13C integrated over tiles = 1.0×1019
Cancellation / reversal ofdeposition shift atB-field reversal
Shift due to ExB drift
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Outline
Analysis methods
2007 #22573-22585 L-mode D2, -2.5T, 0.8MA
2008 #23646-23654 L-mode H2, 2.5T, -0.8MA
2008 #24183-24189 L-mode D2, -2.5T, 0.8MA
Modelling using B2/EIRENE + ERO
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Configuration and plasma parameters
4 L-mode discharges (ECRH)
13CH4 puff 1.6−4.3 s
Only upper Valve
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Tiles after exposure
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
NRA results
Total injected 13CH4 molecules = ?
Total deposited 13C integrated over tiles = 0.5×1019
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Outline
Analysis methods
2007 #22573-22585 L-mode D2, -2.5T, 0.8MA
2008 #23646-23654 L-mode H2, 2.5T, -0.8MA
2008 #24183-24189 L-mode D2, -2.5T, 0.8MA
Modelling using B2/EIRENE + ERO
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Modelling of 2007 results using ERO
B2-EIRENE plasma solutionas background for ERO
ERO runs in a box limitedby the vertical target plate
Impurities exiting box areconsidered lost
L. Aho-Mantila
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Modelling of 2007 results using ERO
ERO recreates both E×B drift andupstream deposition due toneutral dissociation products
L. Aho-Mantila
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, 07.07.2009
Summary
Data sets available for H-mode, L-mode, L-mode with reversed B-field
Present status: benchmarking 2007 data has made significantprogress
Open questions: sticking coefficients at present only used asfudge parameters. What is the role of surface roughness?(Microscopic deposition asymmetries observed)
Benchmarking the same system with 2008 results.If successful, will it also predict the TEXTOR measurements using theSAME input parameters?