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  Edge operational space for high density/high confinement ELMY H-modes in JET

Sartori, R., Saibene, G., Becoulet, M., Lomas, P. J., Loarte, A., Campbell, D. J., et al. (2002). Edge operational space for high density/high confinement ELMY H-modes in JET. Plasma Physics and Controlled Fusion, 44(9), 1801-1813.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-40A0-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-40A1-2
Genre: Journal Article

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Sartori, R.1, Author
Saibene, G.1, Author
Becoulet, M.1, Author
Lomas, P. J.1, Author
Loarte, A.1, Author
Campbell, D. J.1, Author
Andrew, Y.1, Author
Budny, R.1, Author
Beurskens, M. N. A.1, Author
Kallenbach, A.2, Author              
Parail, V.3, Author              
Suttrop, W.4, Author              
Stober, J.5, Author              
Zastrow, K. D.2, Author              
Zerbini, M.1, Author
Monk, R. D.6, Author              
EFDA-JET Work Programme Collaborators1, Author
Affiliations:
1EFDA Close Support Unit, Garching, Germany; CEA, EURATOM Assoc, CE Cadarache, F-13108 St Paul Les Durance, France; UKAEA, Fusion Culham Sci Ctr, Abingdon OX14 3EA, Oxon, England; Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA; FOM, Euratom Inst Plasmafys, Nieuwegein, Netherlands, ou_persistent22              
2Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856293              
3Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society
4Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856292              
5Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
6External Organizations, ou_persistent22              

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 Abstract: This paper discusses how the proximity to the L-H threshold affects the confinement of ELMy H-modes at high density. The largest reduction in confinement at high density is observed at the transition from the Type I to the Type III ELMy regime. At medium plasma triangularity, delta congruent to 0.3 (where delta is the average triangularity at the separatrix), JET experiments show that by increasing the margin above the L-H threshold power and maintaining the edge temperature above the critical temperature for the transition to Type III ELMs, it is possible to avoid the degradation of the pedestal pressure with density, normally observed at lower power. As a result, the range of achievable densities (both in the core and in the pedestal) is increased. At high power above the L-H threshold power the core density was equal to the Greenwald limit with H97 congruent to 0.9. There is evidence that a mixed regime of Type I and Type II ELMs has been obtained at this intermediate triangularity, possibly as a result of this increase in density. At higher triangularity, delta congruent to 0.5, the power required to achieve similar results is lower.

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Language(s): eng - English
 Dates: 2002-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 21194
ISI: 000178415900003
 Degree: -

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Title: Plasma Physics and Controlled Fusion
  Alternative Title : Plasma Phys. Control. Fusion
Source Genre: Journal
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Pages: - Volume / Issue: 44 (9) Sequence Number: - Start / End Page: 1801 - 1813 Identifier: ISSN: 0741-3335