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EU-PWI TF Task Force meeting, Cadarache 16-18 Oct. 2005 1 EU-PWI CONTRIBUTIONS FROM IFP F. Ghezzi Istituto di Fisica del Plasma, C.N.R., EUR/ENEA/CNR Ass.,

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Presentation on theme: "EU-PWI TF Task Force meeting, Cadarache 16-18 Oct. 2005 1 EU-PWI CONTRIBUTIONS FROM IFP F. Ghezzi Istituto di Fisica del Plasma, C.N.R., EUR/ENEA/CNR Ass.,"— Presentation transcript:

1 EU-PWI TF Task Force meeting, Cadarache Oct EU-PWI CONTRIBUTIONS FROM IFP F. Ghezzi Istituto di Fisica del Plasma, C.N.R., EUR/ENEA/CNR Ass., Milano, Italy

2 EU-PWI TF Task Force meeting, Cadarache Oct CHARACTERISATION OF CARBON EROSION AND PROPERTIES OF PLASMA EXPOSED CARBON PFCs UNDER ITER RELEVANT CONDITIONS TW4-TPP-ERCAR Deliverable n.1 STUDY OF SURFACE MORPHOLOGY MODIFICATIONS

3 EU-PWI TF Task Force meeting, Cadarache Oct Objective - Morphology of the Plasma Facing Component Exposed to High Dose (>10 26 m -2 ). -Erosion and Deposition Behavior

4 EU-PWI TF Task Force meeting, Cadarache Oct Results from PISCES-B at high Fluence (October 2002, R. Doerner)

5 EU-PWI TF Task Force meeting, Cadarache Oct Experiment - Tile belongs to the toroidal belt limiter of TEXTOR - Flux 3.7*10 17 cm -2.s * 4.7 h Dose 6.26*10 25 m -2

6 EU-PWI TF Task Force meeting, Cadarache Oct Focusing on the Eroded Zone Sample Position 3 samples from the blade 1 near the transition Erosion -Deposition dominated 1 from the Deposition dominated 1 as blank reference from the opposite surface SEM Picture and EDS Microanalysis on different points for each sample

7 EU-PWI TF Task Force meeting, Cadarache Oct Results Blank Reference Hillock Sand Blasting? Only Carbon and Oxygen

8 EU-PWI TF Task Force meeting, Cadarache Oct Sample 1 - No Grass-like structures - Craters with no patterns - Localized sputtering (arcing?) Mag 400X Mag 2500X Average crater diameter 5 m

9 EU-PWI TF Task Force meeting, Cadarache Oct EDS inside a crater EDS around a crater (white contour) - Si from siliconization - Na, Cl and K surface Contaminants -Cr, Fe and Ni re-deposited from the chamber - Al?

10 EU-PWI TF Task Force meeting, Cadarache Oct PISCES-B TEXTOR T ion = 50 eV T e = 6 eV T sample = 440 °C cost. Exposure = 5000 s Pyrolitic graphite Fluence = 8*10 25 /m 2 Normal incidence T ion = 200 eV T e = 40÷60 eV T sample = 200 °C cost. 800 ÷1200 °C transient Exposure = s IG 110 graphite Fluence = 6.26*10 25 /m 2 Particle incidence? Plasma and Sample Parameters Different Key parameter for Grass-like structure?

11 EU-PWI TF Task Force meeting, Cadarache Oct Sample 2 Sample 4 Sample 5 The Erosion Pattern disappear moving away from the blade

12 EU-PWI TF Task Force meeting, Cadarache Oct EDS ANALYSIS ON MANY SPOTS FOR EACH SAMPLE Divide the sample ideally in a top and bottom half - SAMPLE 1,2 and 3: Fe, Cr, Ni, Si on the top half C and O only on the bottom half - SAMPLE 4 and 5: C and O only on the top half Fe, Cr, Ni, Si on the bottom half - Si always the main peak

13 EU-PWI TF Task Force meeting, Cadarache Oct Summary NO GRASS LIKE STRUCTURE A COMPARISON BETWEEN TEXTOR AND PISCES-B IS NOT ADVISABLE SEM AND EDS CONFIRM THAT MOVING AWAY FROM THE BLADE IT CHANGES FROM EROSION TO DEPOSITION DOMINATED SI IS ALWAYS THE MAJOR IMPURITY

14 EU-PWI TF Task Force meeting, Cadarache Oct CHARACTERISATION OF W AND CFC TARGETS EXPOSED TO ITER-RELEVANT TYPE I ELM AND DISRUPTION TW4-TPP-TARCAR Deliverable 1 :Report on characterisation of EU targets before and after exposure to ITER- relevant Type I ELM and disruption loads in plasma-gun facilities.

15 EU-PWI TF Task Force meeting, Cadarache Oct Objective Type I ELM of MJ/m 2 significant damage of the divertor target. Single ELMs :energy fluxes over the sublimation (CFC) and melting threshold (W) by thermo- mechanical cycling of the material, for those ELMs which are under those thresholds. Disruption loads energy loads above the material damage.

16 EU-PWI TF Task Force meeting, Cadarache Oct targets (6 armoured with CFC NB31, 6 armoured with W- 1%La 2 O 3 and 3 with pure W) will be exposed to plasma-gun at the Russian research institute TRINITI Experiment 1) Weighting (< 1 mg) before and after exposure, mass loss of the material. 2) Profilometry (better than 1 m) of all the targets before and after exposure, profile and melt displacement (for W) 3) Optical and SEM microscopy, surface erosion pattern, crack formation, etc.

17 EU-PWI TF Task Force meeting, Cadarache Oct ) Metalography and ceramography after exposure, thickness of damaged zone in CFC and of the molten and recrystalised layer for W. 5) SIMS, TEM, FIB, etc., will be applied to a subset of the samples if deemed necessary STATUS: Targets are under exposure at TRINITI

18 EU-PWI TF Task Force meeting, Cadarache Oct A MICROPLASMA JET AS ITER WALL DIAGNOSTIC D Discharges in ITER will generate sufficient neutron activation to already impose remote handling for the First Wall First Wall modifications before to put D in ITER RF Microplasma Jet Applications ( OES): - Coating - Etching - Film Deposition - Selective Silicon Oxidation - Synthesis of Carbon Nanostructure

19 EU-PWI TF Task Force meeting, Cadarache Oct FILM DEPOSITION Diagnostic for analyzing chemical reaction in chemical vapor deposition (Ba,Sr)TiO 3 Thermal decomposition of the CVD source molecules Observed by OES (i.e. Calibration) PLASMA PARAMETERS: DC discharge 350 V 4 mA, Carrier Gas N 2 Flow Rate 200 sccm

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23 EU-PWI TF Task Force meeting, Cadarache Oct INNER WALL MODIFICATION OF A PET CAPILLARY Control the Flow in a Electro Osmosis in a Capillary Electrophoresis chip Capillary ~ 500 mm r Quartz Tube 1 or 2 mm r PLASMA PARAMETERS: RF Discharge MHz (commercial), Gas carrier He, Ar, O 2 Flow Rate 100 ÷ 200 sccm Power 3 ÷ 10 W

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27 EU-PWI TF Task Force meeting, Cadarache Oct RF DISCHARGE FOR SI ETCHING Capillary W or SS ø 1mm x 20 mm L PLASMA PARAMETERS: RF Discharge MHz, Gas Carrier Ar, He, CF4, Power ~ 70 W, Flow Rate ~ 70 sccm

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29 EU-PWI TF Task Force meeting, Cadarache Oct ADVANTAGES: - Miniaturization of the plasma volume - Ultra high density ÷ cm -3 - Carrier Gas Pressure 20 mbar ÷ 1 atm - Small eroded quantity on the surface for analysis - High spatial resolution ~ 100 m - Ease to realize a miniaturized total chemical analysis system (vs Raman) DISADVANTAGES: Can observe only ionized and excited species Fragile ( Capillary material)

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31 EU-PWI TF Task Force meeting, Cadarache Oct SPECIES TO BE DETECTED H 2, D 2, T 2, CX n, C, W, Be, Ar, O 2, Ne, N 2 ONLY TO RESOLVE H 2 FROM D 2 HIGH RESOLUTION OES

32 EU-PWI TF Task Force meeting, Cadarache Oct ANALYSIS OF ION AND EXCITED BY OES ANALYSIS OF NEUTRAL BY QMS DISCHARGE AND ANALYSIS FROM 20 mbar to 1 atm CALIBRATION OF OES SENSITIVITY BY QMS BUDGET FORECAST TOTAL k

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