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P. Pelicon, I. Čadež, S. Markelj, Z. Rupnik, P. Vavpetič, N. Grlj Jožef Stefan Institute, Association EURATOM-MHEST, Jamova 39, SI-1000 Ljubljana, Slovenia
S. Brezinsek, A. KreterInstitut für Energieforschung - Plasmaphysik, Forschungszentrum Jülich, Association EURATOM-FZJ, Trilateral Euregio Cluster, D-52425 Germany
T. Dittmar, E. Tsitrone, B. Pégourié, P. LanguilleCEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
M. RubelAlfvén Laboratory, Royal Institute of Technology (KTH), Association EURATOM – VR, SE-10044 Stockholm, Sweden
T. Schwarz-SelingerMax-Planck-Institut für Plasmaphysik, Association EURATOM, D-85748 Garching, Germany
Deuterium mapping with micro-NRA using high energy focused 3He beam for fuel retention studies
EFDA task WP10-PWI-01-02-01/MHST/PSSEWG “Gas balance and fuel retention“ meeting, IPP, Garching, July 2010
Contents:
1. Introduction:experiment
2. Lateral distribution on plasma-facing surface
3. Depth distribution: gaps, bulk
4. Remarks and conclusion
1. Introduction: JSI tandetron, focused ion beam, in-situ ERDA
Focused high-energy ion beam at JSIBiomedicine, geology, fusion, ecology
100 200 300 400
0
50000
100000
150000
200000
250000
Yie
ld
Channel
Au elastic scattering
200 400 600 800 1000
0
500
1000
1500
2000
2500
Yie
ld
Channel
Fast proton peak from
D(3He,p)4He
2 4 6 8 10 12 14 16 18 20
1000
10000
100000
1000000
Cl
Fe
K
Ti
Ca
Cu
Cu
Cr
Ni
Mo
Yie
ld
Energy [ keV ]
Fe
ScanningcoilsChopper
Q tripletlens
Ge X-raydetector
NRAdetector
Sample
RBSdetector
Collimatorslit
3He beam
NRA setup: simultaneous acqisition at four detectors: NRA, RBS, X-ray, chopperList mode: each detector event recordedtogether with the beam positionLateral resolution at 300 pA: 5 µm (beam size), 4.5 MeV 3He2+
3He-Induced X-ray Emmission (3HIXE)
2. Lateral distribution of deuterium on plasma facing surface: CFCs from DITS experiment
F4 T19 (thin, plasma-loaded ?) front surface, side gaps, cleavageF17 T2 (shadowed zone) front surface, side gaps, cleavageF4 T9 (thick deposit) gap Q4L1F17 T7 (shadowed zone) gap Q4L1F26 T9 (erosion) gap Q3L1F29 T9 (erosion) gap Q4L1
Cr
Fe Ni
D
2. Lateral distribution of fuel in the plasma-facing wall
Tore Supra, DITS CFC tile No. F4 T19: thin, plasma-loaded ?
1840 x 1840 µm2
500 1000 1500
500
1000
1500
Horizontal position [m ]
Ver
tical
pos
ition
[m
]
00.40.81.21.62.02.42.83.23.64.04.44.85.25.66.06.46.87.27.68.08.48.89.29.610.010.410.811.211.612.0
x 1019 D at/cm2
D concentration span of 2 orders of magnitude: from 1018 to 1020 D at/cm2
Deuterium is retained in the topographical voids
F4 T19, NRA D map 1840 x 1840 µm2SEM image
3.A Depth distribution: gaps
D Fe Cr Ti
Gap F26T9 Q3L1 (erosion zone)
6.0
m
m
1.8 mm
surface
bottom
Cu
F26 T9 (erosion) gap Q3L1
F29 T9 (erosion) gap Q4L1
F4 T9 (thick deposit) gap Q4L1
F17 T7 (shadowed zone) gap Q4L1
3.B Depth distribution: bulk (cleavages)
F4 T19 (thin, plasma-loaded ?), cleavage scan size 1840 x 1840 µm2 tilt of 4º to deter D surface signal
D map
01700 µm depth
Scans over the cleavages
F17 T2 (shadowed zone), Lot 3 No.7, scan size 1840 x 1840 µm2
Edge rough, tilt 6º, Run 518007
D Fe Cr
depth
F17 T2 (shadowed zone), Lot 3 No.7, cleaved edge, Deuterium projection on the depth axis
0 200 400 600 800 1000 1200 1400 1600 18001E19
1E20
1E21
1E22
De
ute
riu
m c
on
cen
tra
tion
[ a
t / c
m3 ]
Position along the axis of depth [ m ]
Constant D concentration observed in the depth > 400 µm, value 1.15 x 1020 at/cm3
(exact measured value of 1.2 x 10-3 D atom per C atom). This value may be influenced bycutting, etc.
Surface values influenced strongly by the geometry and topography, irrelevant
Constant “bulk “ concentration
Conclusion:
Micro-NRA important support to the retention studies
3He price issue: 15-fold increase of price 2007-2010Last quote (may 2010) 35 kEURO for 10 litre (200 hours of beamtime)
alternatives (micro-ERDA?),Access to USA research-allocated quantities via EFDA?