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SEWG Fuel Retention July 2008 © Matej Mayer Fuel retention in ASDEX Upgrade tungsten coatings M. Mayer, M. Balden, K. Krieger, S. Lindig, O. Ogorodnikova, V. Rohde, K. Sugiyama, and ASDEX Upgrade Team Max-Planck-Institut für Plasmaphysik, EURATOM Association, Garching, Germany Retention in ASDEX Upgrade from post-mortem studies First results on modelling of ASDEX Upgrade retention Surface modifications (blistering)
SEWG Fuel Retention July 2008 © Matej Mayer Retention in ASDEX Upgrade from post-mortem studies
SEWG Fuel Retention July 2008 © Matej Mayer W coverage in AUG 2002 – 2007 Step by step replacement of C tiles by W coated tiles 3 – 4 µm W-PVD on most tiles 200 µm plasma-sprayed W at outer strike point
SEWG Fuel Retention July 2008 © Matej Mayer Deuterium inventory C-dominated campaign 2002/2003 D on divertor tiles 0.9 – 1.3 g D below roof baffle 0.4 g in 3000 s Full W campaign 2007 D on divertor tiles 0.15 – 0.23 g D below roof baffle 0.03 g in 3000 s 6A 4 9B 1A 3A 4940 s 2620 s
SEWG Fuel Retention July 2008 © Matej Mayer Deuterium inventory in inner divertor of all-W machine Correlation between distributions of C and D D inventory in inner divertor still dominated by C-codeposition 6A 4
SEWG Fuel Retention July 2008 © Matej Mayer Deuterium inventory in outer divertor of all-W machine D inventory in outer divertor dominated by trapping in W Deep diffusion (> 3 µm) observed for VPS layers at outer strike point 3B 1
SEWG Fuel Retention July 2008 © Matej Mayer AUG divertor: Evolution of D inventory Carbon dominated machine Total D-inventory dominated by inner divertor and remote areas All-W machine Boronizations result in high D-inventory, co-deposition with B (2005/2006 campaign) D-inventory dominated by trapping in VPS-layers at outer strike point Decrease of total D-inventory by factor 5 – 10 from C-dominated to all-W
SEWG Fuel Retention July 2008 © Matej Mayer First results on modelling of ASDEX Upgrade retention
SEWG Fuel Retention July 2008 © Matej Mayer Retention as function of fluence VPS-W Laboratory and AUG data (VPS-W from tile 1) available Polycrystalline W Laboratory and AUG data (Langmuir probes) available 4 µm PVD-W No data (with known fluence/retention) available Assume same properties as polycrystalline W 4 µm thickness taken into account I 4µm = 0.67 x I Total
SEWG Fuel Retention July 2008 © Matej Mayer 1 3B 2 3A Incident fluence Outer divertor Ion fluence measured with Langmuir probes on tile 1 Extrapolation to tiles 2, 3A Fluence on 3B from erosion in 2004/2005 Inner divertor Assume identical number of ions as outer divertor 4.2 m 2, 10 22 ions/m 2 s Roof baffle Assume 3.3 m 2, 10 21 ions/m 2 s Main chamber Assume 8 m 2, 10 21 ions/m 2 s and 32 m 2, 10 19 ions/m 2 s Codeposition with C 1.9x10 19 C-atoms/s, D/C = 0.4
SEWG Fuel Retention July 2008 © Matej Mayer 1 3B 2 3A Modelling: Outer divertor Good agreement between model and experimental data, keeping the uncertainties in mind
SEWG Fuel Retention July 2008 © Matej Mayer Modelling: Full ASDEX Upgrade Good agreement for outer divertor Model gives too high inventory for inner divertor More realistic fluence data necessary
SEWG Fuel Retention July 2008 © Matej Mayer Modelling: Work in progress Ion fluences for inner divertor K. Krieger, July 2008 Temperature history of outer divertor for 2007 campaign A. Herrmann, July 2008 Inventory in 4 µm PVD-W as function of fluence O. Ogorodnikova, October 2008
SEWG Fuel Retention July 2008 © Matej Mayer Surface modifications (blistering)
SEWG Fuel Retention July 2008 © Matej Mayer = 10 26 D/m 2, T irr = 550 K = 10 26 D/m 2, T irr = 583 K Lab studies, 38 eV D-ions: BlistersAUG, Langmuir-probes: Blisters V. Kh. Alimov
SEWG Fuel Retention July 2008 © Matej Mayer Lab studies, 38 eV D-ions: BlistersAUG, Langmuir-probes: Blisters Blisters are not hollow! V. Kh. Alimov
SEWG Fuel Retention July 2008 © Matej Mayer Lab studies, 38 eV D-ions: BlistersAUG, Langmuir-probes: Blisters Often (always?) widened cracks (grain boundaries?) below blisters V. Kh. Alimov
SEWG Fuel Retention July 2008 © Matej Mayer T irr = 515 K T irr = 567 K Lab studies, 38 eV D-ions: SpongeAUG, Langmuir-probes: Sponge Sponge-like structures are observed V. Kh. Alimov
SEWG Fuel Retention July 2008 © Matej Mayer Summary Retention in ASDEX Upgrade: Decrease of trapped D in divertor by factor 5 – 10 from C-dominated to all-W machine D-inventory in all-W machine determined by deep diffusion into W at outer strike point Modelling of ASDEX Upgrade data: First modelling using experimental laboratory/AUG data and measured AUG fluxes Good agreement for outer divertor, further work needed for inner divertor Surface modifications: Blister-like structures observed in laboratory studies and AUG polycrystalline W No blister cap, not hollow (but often/always cavity/crack observed) These are no classical blisters! Naming?
1 Th LoarerGas balance and fuel retention – EU TF on PWI – 13 November 2006 Th Loarer with contributions from C. Brosset 1, J. Bucalossi 1, P Coad 2, G.
J. Roth, EU PWI TF, SEWG Fuel Retention, Cadarache, June 15, 09 Tritium inventory: Joint international scaling for ITER WP09-PWI-01-01/IPP/PS Status by.
Member of the Helmholtz Association Fuel retention in carbon materials Arkadi Kreter et al.
EU-PWI Taskforce EU PWI TF Meeting Nov. 4 – 6, 2009, Warsaw Summary of the PSI facility review meeting presented by R. Neu based on the Summary of the.
Report IPP Garching EU Task Force PWI Meeting, Cadarache Oct Max-Planck-Institut für Plasmaphysik compiled by Arne Kallenbach (IPP - EU-PWI.
1 Th LoarerGas balance and fuel retention – EU TF on PWI – 29 October 2007 Madrid Th Loarer with contributions from D Borodin, C Brosset, J Bucalossi,
Report on SEWG mixed materials EU PWI TF meeting Madrid 2007 V. Philipps on behalf of SEWG members Mixed material formation is a among the critical ITER.
Annual High-Z /Metal PFC SEWG Meeting, Ljubljana 1-2 October 2009 Studies of Plasma-Wall Interactions Post mortem characterization of exposed tungsten.
A new look at the specification of ITER plasma wall interaction and tritium retention J. Roth a, J. Davis c, R. Doerner d, A. Haasz c, A. Kallenbach a,
Max-Planck-Institut für Plasmaphysik EURATOM Assoziation Interaction of nitrogen plasmas with tungsten Klaus Schmid, A. Manhard, Ch. Linsmeier, A. Wiltner,
M. Mayer SEWG Fuel Retention June Sample Analysis for TS, AUG and JET: Depth Profiling of Deuterium M. Mayer Max-Planck-Institut für Plasmaphysik,
Th Loarer - SEWG on Fuel retention – JET, July Th Loarer with special thanks to S Brezinsek, J Bucalossi, I Coffey, G Esser, S Gruenhagen.
WP10-PWI (02)/TEKES/BS(PS) Characterization of retention mechanisms in AUG Monitoring meeting of the EFDA PWI SEWG on Gas Balance and Fuel Retention,
M. Reinelt, K. Schmid, K. Krieger SEWG High-Z Ljubljana Max-Planck-Institut für Plasmaphysik EURATOM Association, Garching b. München, Germany.
SEWG Meeting HIGH-Z, Ljubljana, October 2009 I. Tungsten distribution on limiters after WF 6 injection in TEXTOR II. SEM and EDX of Melted Tungsten Rods.
Kazuyoshi Sugiyama, SEWG meeting, Culham, July Outline: 1.Introduction 2.Experimental procedure 3.Result 4.Summary Kazuyoshi Sugiyama First.
ERO modelling of local 13 C deposition at the outer divertor of JET M. Airila, L. Aho-Mantila, S. Brezinsek, P. Coad, A. Kirschner, J. Likonen, D. Matveev,
SIMS and RBS analysis of the recent 13 CH 4 experiment J. Likonen, P. Coad, A. Hakola, D. Hole, M. Rubel, J. Strachan, A. Widdowson Joint TFE-SEWG meeting.
K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, Max-Planck-Institut für Plasmaphysik Carbon local transport and redeposition.
Max-Planck-Institut für Plasmaphysik EURATOM Assoziation K. Schmid SWEG Deuterium retention in graphite samples exposed to beryllium-seeded.
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