SEWG Gas Balance 2007 © Matej Mayer First results on deuterium depth profiling in W tiles M. Mayer 1, V.Kh. Alimov, V. Rohde 1, J. Roth 1, A. Herrmann.

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Presentation transcript:

SEWG Gas Balance 2007 © Matej Mayer First results on deuterium depth profiling in W tiles M. Mayer 1, V.Kh. Alimov, V. Rohde 1, J. Roth 1, A. Herrmann 1, and ASDEX Upgrade team 1 Max-Planck-Institut für Plasmaphysik, EURATOM Association, Garching, Germany 2 Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky Prospect 31, Moscow, Russia

SEWG Gas Balance 2007 © Matej Mayer Laboratory results: D in W Retained amount increases with fluence as: D F 0.6 Slow increase at high fluences Strong temperature dependence: From RT to °C decrease by factor 10 O. Ogorodnikova, 2003

SEWG Gas Balance 2007 © Matej Mayer Laboratory results (2): D in W Implantation region: 100 nm with D/W 3% Implantation-affected region: 3 µm with D/W 0.01 – 0.1% due to stress-field: O. Ogorodnikova 2007 Diffusion dominated region: 3 µm – with D/W 0.001%, depending on defect density V.Kh. Alimov 2005

SEWG Gas Balance 2007 © Matej Mayer Laboratory results (3): D in W O. Ogorodnikova 2007 Total amount of D is dominated by trapping deep in the material (for thick samples)

SEWG Gas Balance 2007 © Matej Mayer Analysed tile Exposed for 2 campaigns 2003 – 2005 about 7000 plasma seconds Thin W-coating with 4 µm thickness using PVD 6A 6B 5 4 9A 9B 9C 1 low 1 up 2 3A 3B W C 10

SEWG Gas Balance 2007 © Matej Mayer Temperature history Temperature close to RT, with maximum of 500 K

SEWG Gas Balance 2007 © Matej Mayer D-inventory D/W = 20 – 30% at surface: trapping with C: 2–4×10 21 C/m 2 D/W = 0.01 – 0.1% in W-layer

SEWG Gas Balance 2007 © Matej Mayer Comparison to W-divertor results Inner divertor: Dominated by codeposition with C Outer divertor: Clean W in plasma-exposed areas Comparable amounts in 2005 and 1996 D. Schleußner 1999

SEWG Gas Balance 2007 © Matej Mayer Total amount of D D-inventory: 1.5×10 21 D/m 2 AUG wall area: 72 m 2 1×10 23 D-atoms = 0.3 g D-input in 2 campaigns: 160 g Retention with W-walls: < 0.2% of input Retention with C-walls: 4% of input Mayer 2007

SEWG Gas Balance 2007 © Matej Mayer Future plans Ion-beam analysis of a poloidal section of W-coated tiles Amount of D in top 5 µm Depth-profiling at selected places - NRA - SIMS (TEKES) TDS at selected places Total amount of D Trap energies, allows extrapolations to elevated temperatures