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Abstract

Single pellet injection experiments have been carried out on TFR with the aim to improve the experimental knowledge of ablation physical processes and also to get a better description of the heat and matter transport during and after pellet evaporation. Ablation clouds have been photographed, providing experimental penetration depths in rough agreement with the neutral shielding model. Observation of striations in the cloud has led to an experimental determination of the safety factor profile. Parameters of the plasma in the ablation cloud have been spectroscopically determined. Fast heat transport has been evidenced during pellet evaporation (2z 100 mus) which exhibits some features of minor or major disruptions (appearance of a m = 1, n = 1 island on the q = 1 surface, bursts of density fluctuations, comparable heat diffusivity, ...). Matter transport takes place on a larger time scale (about 10 ms). This long temporal relaxation is well accounted for by the IDMAKOKOT computer code without changing the transport coefficients after pellet injection. Heat and matter transport are affected by the presence of the m = 1, n = 1 island on the q = 1 surface.

Additional information

Authors: TFR GROUP CEA, DEPARTEMENT DE RECHERCHES SUR LA FUSION CONTROLEE, CEN/CADARACHE, SAINT PAUL-LEZ-DURANCE (FRANCE), CEA, DEPARTEMENT DE RECHERCHES SUR LA FUSION CONTROLEE, CEN/CADARACHE, SAINT PAUL-LEZ-DURANCE (FRANCE)
Bibliographic Reference: WRITE TO CEA, MENTIONING REPORT EUR-CEA-FC 1321 EN, 1987
Availability: Can be ordered online
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