1. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid1 E. Tsitrone, J. Roth, A. Loarte, J. Paméla The EU-PWI Task Force: Task agreements for 2008 EU PWI TF under new EFDA Task Agreements and preferential support for 2008 Whats next ?

2. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid2 EU Task Force on Plasma-Wall Interaction Annual Meeting of Contact Persons from 23 associations Defines priority issues Special Expert Working Groups Voluntary Physics Programme 3 year work programme with 23 associations Technological Programme 27 EFDA Tasks (art 5.1a or 5.1b) for 2003-2006 The EU-PWI Task Force under new EFDA Annual Task Agreements (general support) Selected activities within TA eligible for preferential support EU PWI TF … remains a TF under new EFDA (access to financial support TGs)

3. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid3 New tools under new EFDA : Task agreements Deliverables report by each association involved + JET (SEWG meetings) final report by SEWG leader (PWI TF meeting) Financial support : mostly general support (20 %) Selected activities : preferential support ( 40 %) No EFDA contract : implementation through contract of association (CoA) No heavy administration, only Preferential Support to be approved at CCEFU. New managerial tool for SEWG leaders : Work breakdown between associations (art 5) NB : Includes JET activities agreed with JET EFDA leader, but under art 6 Clear set of objectives defined annually

4. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid4 Preferential support : New : for TF (0.5 ppy) and SEWG (0.25 ppy) leadership Available for activities selected by SEWG leaders within TAs : collaborative work (joint experiments, hardware exchange …) specific hardware (diagnostics …) high priority issues (Be, T …) Detailed specifications( ~ EFDA techno tasks) Milestones, deliverables, deadlines final written report by associations involved Ceiling for total amount of ppy/budget Final selection between associations proposals by EFDA + TF leadership Mobility : SEWG and TF meetings collaborative work (joined experiments) New tools under new EFDA : Preferential support and mobility

5. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid5 SEWGTask agreements Gas Balance and Fuel Retention 1. Consolidation of post-mortem analysis with gas balance 2. Multi machine scaling of fuel retention to ITER. Fuel removal 3. Treatment of metallic surfaces including beryllium with oxidising plasmas for fuel removal Dust 4. Joint measurements of dust in different devices. Chemical Erosion and Transport 5. Clarification of chemical erosion under ITER divertor relevant conditions. 6. Transport and deposition of first wall impurities High-Z Materials 7. Development of the PWI basis in support of integrated high-Z scenarios for ITER. ITER Material Mix 8. Determination of expected alloys and compounds and their influence on PWI processes Transient Heat Loads 9. Determination of ELM and Disruption transient loads. 10. Mitigation of transient loads during ELMs and disruptions. 10 Task Agreements for 2008

6. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid6 Objectives and 2008 work programme: SEWG Gas Balance and Fuel Retention I Retention with non carbon ITER materials Carbon / ITER like wall (JET) : complete database with carbon Carbon / full W (AUG) : characterize retention in full W Be/ W / mixed materials (PSI devices) II Discrepancy between particle balance / post mortem analysis Extensive post mortem analysis of PFCs vs integrated particle balance (+ assess uncertainties on both methods) Task agreement : consolidation of post-mortem analysis with gas balance Preferential support : coordinated post mortem analysis of tokamaks PFCs III Multi-machine scaling of retention Start with available data and run joint experiments to complete the database Compare the scaling obtained with modelling for identification of retention mechanisms. Task agreement : multi machine scaling of fuel retention to ITER Preferential support : joint experiments multi machine scaling of fuel retention

7. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid7 Objectives and 2008 work programme : SEWG Fuel Removal I Advance chemical/photonic cleaning towards an ITER relevant system : Improved removal rates with reduced collateral damage in situ in a tokamak Optimisation of flash-lamp (removal rate) and laser (co-deposit volatile) Quantify impact of metallic impurities in co-deposits on removal rates Preferential support : coordinated surface analysis of treated samples (deposits remaining after cleaning and damage to bulk material) II Demonstrate removal of co-deposit in tile gaps with all technologies considered III Compatibility of Be with O cleaning methods Evaluate impact of repetitive oxidising plasmas (GDC/RF) on Be bulk Demonstrate Be/O removal rates (for post-oxidation recovery) Compare nitrogen/oxygen (effect on codeposition, removal rate, impact on Be) Task agreement : treatment of metallic surfaces (Be) with oxidising plasmas for fuel removal Preferential support: : Compatibility of Be with O cleaning methods Impact of repetitive exposure of Be to oxidising plasmas Treatment of oxidised Be samples with glow or RF plasmas (He, Ar …) to establish cleaning rates and assess removed material.

8. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid8 Objectives and 2008 work programme : SEWG Dust I Characterization of dust in existing devices (post mortem analysis) Sampling of dust in different devices for analysis (size distribution, shape, composition, specific surface area) vs operating modes, maintenance etc II. Initial assessment of dust generation for ITER standard scenario with existing models (not validated) III. Initial assessment of diagnostics techniques a) During plasmas and disruptions (visible, IR, CCD cameras, Rayleigh scattering) Initial assessment for electrostatic detectors and capacitive microbalance b) Between plasmas (Mie scattering after gas injection) c) Calibration for dust diagnostics : assessment of best technique to be selected (laser ablation, pellets, mobile sieve, etc) d) Specifications for proposal of a future diagnostic implementation under preferential support Task agreements : joint measurements of dust in different devices. Preferential support: : Coordinated analysis of dust from different devices Diagnostic exchange between devices for joint characterization of dust during plasmas (fast cameras)

9. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid9 Chemical Erosion: 1. Chemical Erosion: ObjectivesTask agreements required 2007/2008Spectroscopic measurements of chemical erosion under detached conditions in divertor tokamaks Clarification of chemical erosion under ITER divertor relevant conditions Termination of chemical erosion objectives. Major findings to be confirmed in Magnum PSI after completion High ion flux exposure in PILOT/MAGNUM and PSI-2 2008Impact of ELMs on chemical erosion in detached conditions Re-erosion and in-situ layer disintegration in the inner divertor Activity proposed for funding under preferential support Coordinated modelling effort of joint experimental and modelling group of experts for validation of chemical erosion in tokamaks and extrapolation to ITER Objectives and 2008 work programme : SEWG Chemical erosion and transport (I)

10. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid10 Transport: 2. Transport:ObjectivesTask agreements required 2007/2008 Transport investigations using 13 CH 4 tracer injection in divertor tokamaks and plasma transport modelling Task agreement on the transport and deposition of first wall impurities Shot resolved diagnostic of erosion/deposition Activity proposed for funding under preferential support Establishment of local and erosion/deposition balance of metallic impurities in divertor tokamaks under ITER divertor conditions Objectives and 2008 work programme : SEWG Chemical erosion and transport (II)

11. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid11 ObjectivesTask agreements required 2007/2008Exploitation of all-W ASDEX Upgrade Melt layer behaviour under realistic conditions Interaction of plasma particles with W surfaces 2008Extension and improvement of diagnostic tools for W erosion in JET and ITER Task agreement on development of the PWI basis in support of integrated high-Z scenarios for ITER Activity proposed for funding under preferential support Development of alternative coatings of high-Z materials Development of thick coatings under specifications developed by the TF and characterisation of coating techniques for tungsten components Objectives and 2008 work programme : SEWG High Z materials

12. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid12 ObjectivesTask agreements required 2008Compound formation in binary mixing of Be, C and W Collect data on composition, fuel retention and chemical characterisation of Be-C deposits Modelling of material mixing for extrapolation to ITER conditions Task agreement on the expected alloys and compounds and their influence on PWI processes Activity proposed for funding under preferential support Production of coatings as mock-up for PWI studies, specifically of the reactions including oxygen, formed alloys and compounds, hydrogen isotope retention and removal Objectives and 2008 work programme : SEWG ITER like material mix

13. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid13 Determination of ELM and Disruption transient loads Optimisation of measurements of power/particle fluxes during mitigated and unmitigated ELMs and disruptions by interchange of diagnostics & sharing of analysis techniques/software Determination of Type I ELM power/particle fluxes to PFCs in coordinated experiments (dimensionless pedestal identity and / * scans) Model validation & ITER extrapolation Determination of disruption power/particle fluxes to PFCs in coordinated experiments (Type I ELMy H-mode,VDEs, ITB collapse, etc.) identification of main physics processes and development of scaling laws & models for extrapolation to ITER Mitigation of transient loads during ELMs and disruptions Develop common base for evaluation of mitigation effectiveness for disruptions : thermal quench & runaway suppression by MGI, current quench & runaway suppression by ECRH initial assessment of feasibility/application to ITER ELM : mitigation by pellets in comparable Type I ELMy H-modes initial assessment of feasibility/application to ITER Objectives and 2008 work programme : SEWG Transient heat loads and mitigation

14. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid14 Whats next ? Call to be launched soon … Objectives: confirmation of work offered by Associations in 2006-2008 WP (through the draft TAs) additional contributions as needed opportunity for new Associations to join the programme preferential support (under precise specifications) What already happened in 2007 : STAC Feb 2007 : highlights 2006 + midterm work program STAC May 2007 : TAs and preferential support for 2008 : approved. To be implemented when new EFDA in force To be sent to HRUs + contact persons : 10 drafts of TAs : associations fill up proposals for participation + associated resources 1 draft for all activities proposed for preferential support : associations encouraged to send common detailed proposal (coordinated by SEWG leaders) Ceiling for preferential support for 2008 : ~17 ppy and 300 kEuros Whats next ?

15. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid15 Example of draft TA : multi machine scaling of fuel retention AssociationActivityEstimated ressources (ppy) CEA Cadarache -Fuel retention as a function of plasma parameters (long pulses at higher ne / higher Padd + lower Te) -Modelling of fuel retention in TS CRPPDedicated fuel retention experiments FZ Juelich- Modelling of fuel retention in TS and JET - Recycling of (all) hydrogen isotopes: spectroscopy and flux measurements, also on different materials - Exploitation of QMBs in TEXTOR and JET IPP Garching- Fuel retention in ASDEX Upgrade: effect of increasing the W coverage of the PFCs, effect of plasma scenario Total JET TF E and TF FT Dedicated fuel retention studies (TF E) Modelling of fuel retention in JET Confirm (or suppress !) activity Fill up associated resources Propose new contribution

16. E. Tsitrone, EU PWI TF meeting, 29-31 oct 2007, Madrid16 Summary The EU PWI TF remains a TF under new EFDA Added value of the TF recognized : increased collaborative framework (joined experiments, common analysis, scientists exchange) focus on ITER priority issues New tools : task agreements, preferential support, mobility Implementation started for 2008 : transition year (phasing CoA and TF WP …) Questions (to Jerome …) welcome !