Reduction of divertor heat load in JET ELMy H-modes using impurity seeding 
techniques

Rapp, J.; Monier-Garbet, P.; Andrew, P.; Dumortier, P.; Eich, T.; Fundamenski, W.; von Hellermann, M.; Hogan, J.; Ingesson, L. C.; Jachmich, S.; Koslowski, H. R.; Loarte, A.; Maddison, G.; Matthews, G. F.; McDonald, D. C.; Messiaen, A.; Ongena, J.; Parail, V.; Philipps, V.; Saibene, G.; Sartori, R.; Unterberg, B.; JET-EFDA Contributors,

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Reduction of divertor heat load in JET ELMy H-modes using impurity seeding techniques

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Eich, T.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

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Parail, V.
Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

Rapp, J., Monier-Garbet, P., Andrew, P., Dumortier, P., Eich, T., Fundamenski, W., et al. (2003). Reduction of divertor heat load in JET ELMy H-modes using impurity seeding techniques. In Fusion Energy 2002. Vienna: Internat. Atomic Energy Agency.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-3C57-D

Abstract

One of the most severe problems for fusion reactors is the power load on the divertor target plates. In order to reduce the power load in the divertor radiation cooling by seeding of impurities is essential. Presently unseeded type-I ELMy H-modes appear not to offer a solution to those problems. Alternative operating scenarios with tolerable transient heat loads have to be developed. One of the potential alternative scenarios is the ELMy H-mode with impurity seeding. The paper summarises the work aimed at the reduction of the heat load to the target plates, both during, and inbetween ELMs, using the radiation of a purposely injected impurity. Two scenarios, the impurity seeded type-I ELMy H-mode and the impurity seeded type-III ELMy H-mode are compared. The ability of both scenarios to meet the integrated ITER requirements for Q=10 and acceptable target power loads is discussed in the paper.