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1TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 TPL dismantling project review D program : analysis for D content,

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Presentation on theme: "1TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 TPL dismantling project review D program : analysis for D content,"— Presentation transcript:

1 1TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 TPL dismantling project review D program : analysis for D content, erosion/redeposition and samples management

2 2TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 TORE SUPRA : TOROIDAL PUMP LIMITER Plasma Facing Components of the limiter PLANSEE (AMC) CFC Armour CFC Heat sink Copper alloy 6mm Water Inlet / outlet TPL 30° sector 48 standard PFC

3 3TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 CFC Tiles of the TPL z y x x = 23 mm x = 28 mm y = 22 mm 21 tiles, length & width x 30° sector, 48 fingers x Fibre directions y z y z

4 4TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 What do we expect in erosion area? y x z - Uniform distribution of D in (x,y) plans except, may be, near the edges of the tiles due to shadowing effects of bordering tiles - Decreasing depth profile in z direction, up to 2, 4, 6mm? - Presence of carbon deposits in the gaps (D concentration <1% NMR and µNRA measurements) - Possible segregation in the rear surface of copper coming from the Cu/CFC interface

5 5TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 What do we expect in carbon deposition area? - D concentration of 5 up to 10% in the deposited carbon layer (previous results from NMR & µNRA experiments) - Low D concentration in CFC since the deposition area is a self-shadowed area (only radiated flux) y x z

6 6TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 Analysis programme (1/2) Need to find out the deuterium in all the thickness of the tiles if necessary Cross-checking of different methods of investigation MethodCharacteristicRemarks NRA 2 H( 3 He,p) 4 He Ion-beam analysis 3 He energy MeV High selectivity & sensitivity Depth profiling (up to 8-10µm) Need thin films or extrapolation of the D profile to obtain D content Non-destructive but ion-induced detrapping µNRA 2 H( 3 He,p) 4 He Beam size ~5x5µm 1-3 MeV Dedicated to D trapping sites investigation (in parallel with local probe like MET/EELS) SIMS Ion sputtering O 2+ (10-15keV) Qualitative depth profiling of D, C and impurities (H, B, metals) Can be quantitative by NRA cross- checking Destructive method TDS Thermal desorption spectroscopy RT

7 7TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 D Retention Analyses: Current collaborations: –NRA: IPP Garching (J. Roth team, Germany) –µNRA: Laboratoire Pierre Süe (CEA/DSM/LPS, CEA Saclay, France) –SIMS: Laboratoire dEtudes et dExamens des Combustibles (CEA/DEN/DEC/LE2C/LECA, CEA Cadarache, France) –TDS: IPP Garching (J. Roth team) MEPhI (L. Begrambekov team, Russia) & DRFC (IPP Group) New proposals…

8 8TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 Analysis programme (2/2) Mobility and retention of D in CFC are related to the structure of pores and surfaces available inside the material CFC structure is suspected to be modified under high heat flux irradiation irradiated CFC characterization is needed MethodCharacteristicRemarks Adsorption isotherms (*) Thermodynamical method Micro, meso, macro-porosity investigation MET (*), X-ray diffraction Structural method Structure & texture investigation Raman, ATR/FT- IR Spectroscopic methods Vibrational structure C-D bonding investigation MET/EELS (*) Structural & electron methods Electron structure (C hybridization state) C-D bonding investigation (*) destructive technique

9 9TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 CFC Characterization: Current collaborations: –Porosity & structure investigations: Laboratoire de Physique des Interactions Ioniques et Moléculaires (PIIM), P. Roubin team (Université de Provence, France) –Atomic & electron structure: Laboratoire TECSEN, F. Bocquet (Université Paul Cézanne, France) & N. Bernier (DRFC – PhD student) –Electron microscopy: Centre Pluridisciplinaire de Microscopie & de Micronalyse (CP2M), W. Saikaly (Université Paul Cézanne, France) New proposals…

10 10TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 Samples Preparation Objectives: 1) being able to analyse D-retention related issues all along the thickness of the tiles 2) being able to perform different complementary experiments on the same tile, even if most of the techniques are destructive 3) being able to work with different groups, in different laboratories, on the same tile samples and at the same time

11 11TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 The first step will be the cutting of the CFC tiles from the heat sink because the main source of radioactivity is collisions between neutrons (produced during plasma discharges) and impurities contained in the copper alloy of the heat sink. Due to this radioactivity, a one month wait is mandatory before doing anything. As soon as we will obtain the official agreement for working on the fingers, we will perform the cutting. The delay could reach 1 to 6 months. Since we want to analyze the CFC all along the z direction, we will cut the tiles precisely at the interface between CFC and Copper. At least, 4mm thick CFC samples are expected to be obtained. This operation is expected to be performed at the DRFC. Samples Preparation

12 12TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 Samples Preparation I propose to cut the tiles in 4 identical parts Successful tests have been performed using a saw equipped with a diamond wire (CP2M) Polishing the surfaces might be necessary Tests are under way For NRA experiments Analyses can be performed both on the top-surface (taking into account the carbon layer) and on the side (z direction) allowing to study the depth profile in different points (even at low energy) z Two ~10x10x2mm samples for TDS experiments (typical sample size required for the DRFC device) D content in the first 2mm thick part of the tile D content in the last 2mm thick part of the tile For CFC characterization studies For SIMS analyses 23 to 28mm 22mm ~4mm

13 13TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 Timing sector dismantling: May 2007 CFC tiles available: 1 to 6 months later Samples available at the DRFC: ~1 month later Samples available for exporting outside the CEA centre: ~2/3 weeks later If this forecast is good, we can expect to begin the analysis at the latest in February 2008 and, in the best case, in Sept./Oct

14 14TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 Erosion/deposition measurements Objective: mapping of the erosion & carbon deposition areas Means: confocal microscopy Scans of 100x100mm Steps of 0.1mm z resolution <1µm

15 15TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 Saw equipped with diamond wire

16 16TPL dismantling project review C. Brosset TORE SUPRA Association EURATOM-CEA 2006/12/08 Sepcarb ® CFC-N11 (Snecma Propulsion Solide, SAFRAN Group)


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