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?