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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, ions/m 2 s Roof baffle Assume 3.3 m 2, ions/m 2 s Main chamber Assume 8 m 2, ions/m 2 s and 32 m 2, 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 = D/m 2, T irr = 550 K = 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?
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.
ITPA Avilla January 2008 © Matej Mayer Surface modifications and blistering of tungsten exposed in ASDEX Upgrade M. Mayer, M. Balden, S. Lindig, J. Roth,
Kazuyoshi Sugiyama, SEWG meeting on Fuel retention, Garching, July Contribution of Boron on the D retention in the AUG full-W wall regime Max-Planck-Institut.
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.
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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,
Kazuyoshi Sugiyama, SEWG meeting, Culham, July Outline: 1.Introduction 2.Experimental procedure 3.Result 4.Summary Kazuyoshi Sugiyama First.
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Annual High-Z /Metal PFC SEWG Meeting, Ljubljana 1-2 October 2009 Studies of Plasma-Wall Interactions Post mortem characterization of exposed tungsten.
6 th EU PWI TF Meeting Madrid, Oct Tritium Inventory in ITER: Laboratory data and extrapolation from tokamaks Th Loarer, J Roth, S Brezinsek, A.
Kazuyoshi Sugiyama, SEWG meeting on Fuel retention, Garching, July Max-Planck-Institut für Plasmaphysik D retention and release behaviour of.
J. Roth, EU PWI TF, SEWG Fuel Retention, Garching, July 19, 2010 Report on: WP10-PWI /IPP/PS Multi machine scaling of fuel retention for ITER Validation.
M. Mayer SEWG Fuel Retention June Sample Analysis for TS, AUG and JET: Depth Profiling of Deuterium M. Mayer Max-Planck-Institut für Plasmaphysik,
V.Philipps, SEWG mixed materials, EU PWI meeting Frascati, Oct 2008 EU Task Force Plasma Wall Interaction SEWG material mixing, report on 2008 activities.
V.Philipps, EFPW Padua, Dec 2005 Introduction Report on the European Task Force on Plasma Wall Interaction 2005 V. Philipps, J. Roth, A. Loarte on behalf.
TFE Th Loarer – SEWG – 12 September Euratom Th Loarer V Philipps 2, J Bucalossi 1, D Brennan 3, J Brzozowski 4, N Balshaw 3, R Clarke 3, G Esser.
Alberto Loarte EU Plasma-Wall Interaction Task Force Meeting – Jozef Stefan Institute – 11 – Report on EU-PWI SEWG on Transient Loads Alberto.
PWI TF Meeting, Warsaw, K. Krieger, 04/11/2009 Report on task agreements of WP09-PWI-07 within SEWG ITER Material Mix K. Krieger, A. Hakola, Ch. Linsmeier,
JET PFC Analysis, TFFT and the ILW JET J P Coad EURATOM/UKAEA Culham Division, Abingdon, UK Introduction to TFFT and interaction with JET Summary of programme.
1/18 TORE SUPRA Association Euratom-Cea B. Pégourié – SEWG Gaz Balance & Fuel Retention - JET – July 22-23, 2008 Tore Supra – repetitive long discharges.
Member of the Helmholtz Association Fuel retention in carbon materials Arkadi Kreter et al.
Th Loarer - SEWG on Fuel retention – JET, July Th Loarer with special thanks to S Brezinsek, J Bucalossi, I Coffey, G Esser, S Gruenhagen.
CIPS SEWG FR, JET 2008C. Hopf O 2 /He glow discharge cleaning: Experience at IPP Christian Hopf, Volker Rohde, Wolfgang Jacob Max-Planck-Institut für Plasmaphysik.
EU Plasma-Wall Interaction TF – Meeting – SFA Ljublijana SEWG Chemical Erosion S. Brezinsek EU Plasma-Wall Interaction TF – Meeting
Report on SEWG ITER like Material Mix V. Philipps on behalf of SEWG working group* Decided during EU -TF meeting Cadarache, 2005 Work programme defined.
L.B. Begrambekov 1, O.I. Buzhinsky 2, A.M. Zakharov 1 1 National Research Nuclear University MEPhI, 31 Kashirskoe sh., Moscow , R.F 2 Troitsk Institute.
V.Philipps, SEWG Gas balance and fuel removal, JET, , Association EURATOM – FZJ Effect of disruptions on fuel release from JET walls V. Philipps,
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