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Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT Chemical Erosion Research at CIEMAT (Madrid) presented by F. Tabar é s Laboratorio Nacional de.

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Presentation on theme: "Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT Chemical Erosion Research at CIEMAT (Madrid) presented by F. Tabar é s Laboratorio Nacional de."— Presentation transcript:

1 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT Chemical Erosion Research at CIEMAT (Madrid) presented by F. Tabar é s Laboratorio Nacional de Fusión por Confinamiento Magnético Asociación EURATOM/CIEMAT. Madrid.Spain SEWG Meeting JET 23March. 2007

2 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT OUTLINE Carbon contamination studies in TJ-II Photon yields Material erosion Laboratory studies of Chemical Erosion Carbon contamination studies in TJ-II Photon yields Material erosion Laboratory studies of Chemical Erosion SEWG Meeting JET 23March. 2007

3 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT PFC in TJ-II -TJ-II Stellarator (R=1.5 m, a <0.23 m, B=1T) -Boronisation at beginning of the exp. campaign 4 gr o-carborane in He GD --> B/C ~ 50nm+ He/Ne GD 30 min at beginning of experimental day. -Two Graphite Limiters, movable, instrumented. -ECRH plasmas (up 600 kW): good impurity control (Z~1) and acceptable density control. -NBI plasmas (400 kW): loss of density control. In progress: - Lithium coating in 2007 campaign - Upgrade of heating systems (2 NBI) -TJ-II Stellarator (R=1.5 m, a <0.23 m, B=1T) -Boronisation at beginning of the exp. campaign 4 gr o-carborane in He GD --> B/C ~ 50nm+ He/Ne GD 30 min at beginning of experimental day. -Two Graphite Limiters, movable, instrumented. -ECRH plasmas (up 600 kW): good impurity control (Z~1) and acceptable density control. -NBI plasmas (400 kW): loss of density control. In progress: - Lithium coating in 2007 campaign - Upgrade of heating systems (2 NBI) SEWG Meeting JET 23March. 2007

4 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT Edge Diagnostics Li Beam Supersonic He Beam +Reflectrometer, Langmuir Probes Limiter, Press gauges, RGA…. SEWG Meeting JET 23March. 2007

5 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT CH 4 and C 2 H 4 have been injected at the plasma edge using a mobile, instrumented limiter, producing local C-films.Identical(reference)limiter at 180 deg. (PSI-2006 to appear J. Nucl. Mat, PSI 04, EPS 05….) C 2 H 4 presents lower fuelling efficiency than H 2 C 2 H 4 presents lower fuelling efficiency than H 2 C:H film formation and erosion SEWG Meeting JET 23March C 2 H 4 injection produced C-layers with high H content (from particle balance) -No difference between erosion of methane/ethylene layers - Physical sputtering dominant for carbon erosion in TJ-II - C 2 H 4 injection produced C-layers with high H content (from particle balance) -No difference between erosion of methane/ethylene layers - Physical sputtering dominant for carbon erosion in TJ-II R-R 0 (m) Z (m) CH emission gass-puff hole H limiter

6 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT

7 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT SEWG Meeting JET 23March. 2007

8 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT Erosion of local C-layers Comparison of erosion of the deposited films by plasmas fed by local puffing or by distant puffing Comparison of erosion of the deposited films by plasmas fed by local puffing or by distant puffing Global contamination of the full wall Global contamination of the full wall Higher erosion by plasmas feed away for the limiter Higher erosion by plasmas feed away for the limiter SEWG Meeting JET 23March. 2007

9 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT SEWG Meeting JET 23March For one electron collisional process: CH 4 + e CH 3 +prod (Eth1) CH*+prod (Eth 2) -D/XB = A. exp(- Eth/kT) For one electron collisional process: CH 4 + e CH 3 +prod (Eth1) CH*+prod (Eth 2) -D/XB = A. exp(- Eth/kT) Eth

10 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT EIRENE data Basis Constant D/XB ??

11 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT Verification of data basis required!

12 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT Afterglow Emission Ethylene Methane Hydrogen - Fast decay of Te( 1ms) - Detrapping of injected hydrocarbon ?? - Fast decay of Te( 1ms) - Detrapping of injected hydrocarbon ?? Te dep. of D/XB at low Te?? Ne CH Ha ECE Ne CH Ha ECE

13 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT Doped-C studies (2007) CD,C 2, He beam emission -Chemical sputtering of doped graphite (metal carbides) (in collaboration C. Garcia-Rosales) TJ-II NBI Plasma C dopedC Methane/He injection Holder: rotable, radial displacement SEWG Meeting JET 23March : Nanometric carbides, Ti, Si,..

14 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT Cryogenic Trap Assisted Mass Spectrometry (CTAMS) 1-pumping system7-diaphragm 2-B-A manometer8-mass spectr. 3-Cap. Manometer9-optic port 4-cutting valve10-manipulator 5-gas inlet11-cryogenic trap 6-anode12-float V measure 1-pumping system7-diaphragm 2-B-A manometer8-mass spectr. 3-Cap. Manometer9-optic port 4-cutting valve10-manipulator 5-gas inlet11-cryogenic trap 6-anode12-float V measure Vapor pressure vs. T for different species Vapor pressure vs. T for different species J.A. Ferreira et al. PFMC-11. Griefswald IAEA. Chengdu 2006 Submitted: J.Vac.Sci.Tech. Chem Vap. Dep. J.A. Ferreira et al. PFMC-11. Griefswald IAEA. Chengdu 2006 Submitted: J.Vac.Sci.Tech. Chem Vap. Dep. CTAMS

15 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT H 2 :CH 4 plasma Liquid N 2 Minor masses during DC plasma glow dischargeConditions: Total Pressure 8 mTorr %CH 4 ~20% I=100 mA V=560 V C 2 H 2 ΔM 25 / ΔM 26 =0,2 Other hydrocarbons?? C 2 & C 3

16 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT Detection of trace C 3,C 4 … hydrocarbons in the 10 ppm range! Warming up of the trap (~30mK/s) Information presently available for several systems, e.g. Ar, N 2,H 2 sputtering on C:H films Implementation in fusion devices? Release of condensate

17 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT Equilibrium pressures, C1-C4 HCs Table I: Equilibrium temperatures at two pressure values of interest in a-C:H and a-C/N:H deposition plasmas. Species T (K) P=133Pa T (K) P=133Pa T (K) P=0.1Pa T (K) P=0.1Pa Species T (K) P=133.3Pa T (K) P=133.3Pa T (K) P=0.1Pa T (K) P=0.1Pa Methane 65,02 44,84 1,3-Butadiene (C 4 H 6 ) 170,3 126,9 Ethylene (C 2 H 4 ) 104,8 77,5 n-Butane (C 4 H 10 ) 171,6 125,1 Ethane (C 2 H 6 ) Ethane (C 2 H 6 ) 113,6 81,7 trans-Butene (C 4 H 8 ) 173,7 128,6 Acetylene (C 2 H 2 ) 130,2 90,1 2-Methyl-1-Propene (C 4 H 8 ) 168,0 129,4 Propylene (C 3 H 6 ) 141,2 104,7 cis-Butene (C 4 H 8 ) 176,7 132,3 Carbon dioxide (CO 2 ) Carbon dioxide (CO 2 ) 138,8 106,1 1-Butyne (C 4 H 6 ) 180,6 136,2 Propane (C 3 H 8 ) 144,2 106,1 Butenyne (C 4 H 4 ) 179,9 136,9 Propyne (C 3 H 4 ) 162,1 113,9 1,2-Butadiene (C 4 H 6 ) 184,1 138,8 1-Butene (C 4 H 8 ) 168,3 115,5 2-Butyne (C 4 H 6 ) 200,1 138,9* Propadiene (C 3 H 4 ) 152,5 116,2 Butadiyne (C 4 H 2 ) 190,6 158,3 Isobutane (C 4 H 10 ) 163,9 121,5 Water (H 2 O) 255,8 199

18 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT CTAMS results Ar/H 2 (20:80) plasma N 2 /H 2 (20:80) plasma condensation release Main product: acetylene Main product: acetylene Main product: HCN Main product: HCN SEWG Meeting JET 23March. 2007

19 Laboratorio Nacional de Fusión Asociación EURATOM-CIEMAT Future Plans SEWG Meeting JET 23March a)Redeposited layers by CxHy injection: - Erosion yield by H/He plasmas b) Photon yields -Afterglow experiments -Supersonic beam injection: He seeding c) Doped Graphites - Effect of H content and doping d) Mechanism studies - CTAMS studies in technical plasmas a)Redeposited layers by CxHy injection: - Erosion yield by H/He plasmas b) Photon yields -Afterglow experiments -Supersonic beam injection: He seeding c) Doped Graphites - Effect of H content and doping d) Mechanism studies - CTAMS studies in technical plasmas


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