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ITPA-9, Avila, Spain, 7-10. 01. 2008 Impact of ICRF on impurity production in TEXTOR Presented by Marek Rubel Alfvén Laboratory, Royal Institute of Technology,

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Presentation on theme: "ITPA-9, Avila, Spain, 7-10. 01. 2008 Impact of ICRF on impurity production in TEXTOR Presented by Marek Rubel Alfvén Laboratory, Royal Institute of Technology,"— Presentation transcript:

1 ITPA-9, Avila, Spain, 7-10. 01. 2008 Impact of ICRF on impurity production in TEXTOR Presented by Marek Rubel Alfvén Laboratory, Royal Institute of Technology, Association EURATOM – VR, Stockholm, Sweden in co-operation with B. Emmoth, P. Wienhold, Ph. Mertens, V. Philipps E. Fortuna, M. Pisarek and W. Zieliński Outline: Collector probe data Analysis of deposits from ICRF antenna grill

2 Impact of ICRF on impurity production Collector probe data (1) Probe exposure in time-resolved mode to ICRF heated pulses. Time resolution: 125 ms Probe position: 25 – 85 mm in the SOL; data presented for 37 mm. Message: Increase of metal (Ni, Cr, Fe) impurity fluxes during ICRF heated pulses. Increased deposition rates are measured also for deuterium and oxygen. 00242 Plasma current and density

3 Impact of ICRF on impurity production Collector probe data (2) Probe exposure in time-resolved mode to ICRF heated pulses Message: Increase of metal (Ni, Cr, Fe) impurity fluxes during ICRF heated pulses.

4  1.83.45.0 ICRH, An- 1 5.14.612.8  4.31.18.8 ICRH, An- 2 5.16.913.0 HeatingSi 10 15 cm -2 s -1 B 10 14 cm -2 s -1 Me 10 13 cm -2 s -1 Impact of ICRF on impurity production Collector probe data (3) Probe exposure in time-integrated mode to Ohmic and ICRF pulses Message: Increase of all impurity fluxes during ICRF heated pulses.

5 Co-deposits on ALT-II and antenna grill 1. ALT-II 2. ICRF antenna Antenna grill 2m2m 2m2m Deposition zone on ALT-II

6 Element Limiter ALT-II Antenna Grill C75-8024-27 O10-1515-17 Fe~120-23 Si1-1023-28 B3-10- Cr-6-7 D*9-123-5 Composition of co-deposits: Deposition zone on limiter and antenna grill Messages: Differences in the content of elements More light elements – C and B - on ALT-II toroidal belt limiter Prevalence of heavy elements on the antenna grill

7 Distribution of elements in co-deposits on the toroidal belt limiter Message: Heavier elements embedded in an uniform carbon matrix. C Fe Si

8 Distribution of elements in co-deposits from the antenna grill Message: Distinct separation of elements in co-deposits from the antenna.

9 Increase of impurity fluxes in the SOL during ICRF phase. ICRF-induced modification of the SOL (edge temperature, electric sheath, ion trajectories) influence the structure and composition of co-deposits. The increase of deuterium atomic density (1.5-3 times) and ion energies (up to 5 times) cause preferential removal of carbon from co-deposits on the antenna. Concluding Remarks

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