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Modifications of power scrape-off-length, power deposition and H(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 H(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 infra-red and visible H(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.

Additional information

Authors: GUILHEM D ET AL., CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);EVANS T, General Atomics, San Diego (US);HORTON L, Oak Ridge National Laboratory, Oak Ridge (US);MIODUSZEWSKI P, Oak Ridge National Laboratory, Oak Ridge (US)
Bibliographic Reference: Paper presented: 32nd Annual Meeting of the American Physical Society, Division of Plasma Physics, Cincinnati (US), Nov. 12-16, 1990
Availability: Available from (1) as Paper EN 35858 ORA
Record Number: 199111334 / Last updated on: 1994-12-02
Original language: en
Available languages: en