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 transcript:

ITPA-9, Avila, Spain, 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

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 Plasma current and density

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.

 ICRH, An  ICRH, An HeatingSi cm -2 s -1 B cm -2 s -1 Me 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.

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

Element Limiter ALT-II Antenna Grill C O Fe~ Si B3-10- Cr-6-7 D* 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

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

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

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