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Experimental evidence of the location of the ergodic divertor separatrix is shown to agree with the predicted value given by codes. Variation of this position modifies the divertor tightness, defined as the ration of the divertor to core density. This effect is governed by laminar transport, i.e. transport proportional to the magnitude of the perturbation. Operation with feedback control of the divertor temperature allows one to optimize the choice of injected impurity species. at 10 eV divertor temperature, nitrogen is shown to lead to the largest decrease in energy flux to the divertor at lowest contribution to Z(eff). Parallel energy fluxes as low as 2 MW m{-2} are thus achieved on the target plates. For this impurity, radiation is localized in the divertor volume thus leading to radiation compression close to 10. The ergodic divertor appears as a powerful tool to control plasma-wall interaction with no loss of core confinement or plasma current.

Additional information

Authors: THE TORE SUPRA TEAM, CEA, Cadarache, Saint-Paul-lez-Durance (FR);GHENDRIH P H ET AL, CEA, Cadarache, Saint-Paul-lez-Durance (FR);MANK G, Forschungszentrum Jolich GmbH, Institut fur Plasmaphysik (DE);FINKEN K H, Forschungszentrum Jolich GmbH, Institut fur Plasmaphysik (DE)
Bibliographic Reference: An article published in: Journal of Nuclear Materials, Vol.290-293 (2001), pp.798-804
Record Number: 200113820 / Last updated on: 2001-10-04
Original language: en
Available languages: en