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Ergodic divertor effect on heat and particle flux in Tore Supra

Modifications of power scrape off length, power deposition and hydrogen alpha recycling patterns on a pump limiter head and on the inner wall are studied during various configurations in ohmic Tore Supra plasmas. They are extremely sensitive to the current in the ergodic divertor. When the ergodic divertor is off, the power flux to the limiter is symmetric with respect to the toroidal and poloidal directions, but hydrogen alpha pattern and particle flux are asymmetric with respect to the toroidal direction. When the ergodic divertor is on, power and particle fluxes are asymmetric, as can be seen by infrared and visible hydrogen alpha light of the front face of the pump limiter.

Numerical computation of magnetic topology and analytical analysis of transport have been developed for the ergodic divertor scheme and qualitative agreement is found with experimental results.

Reported by

Commissariat à l'Energie Atomique (CEA)
Centre d'Études de Cadarache Sere-Ders
13108 Saint-Paul-lez-Durance
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