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  Local physics basis of confinement degradation in JET ELMy H mode plasmas and implications for tokamak reactors

Budny, R. V., Alper, B., Borba, D. N., Cordey, J. G., Ernst, D. R., Giraud, C., et al. (2002). Local physics basis of confinement degradation in JET ELMy H mode plasmas and implications for tokamak reactors. Nuclear Fusion, 42(1), 66-75.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-415E-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-415F-1
Genre: Journal Article

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 Creators:
Budny, R. V.1, Author
Alper, B.1, Author
Borba, D. N.1, Author
Cordey, J. G.1, Author
Ernst, D. R.1, Author
Giraud, C.1, Author
Gowers, C. W.1, Author
Gunther, K.1, Author
Hahm, T. S.1, Author
Hammett, G. W.1, Author
Hawkes, N. C.1, Author
Horton, L. D.2, Author              
Saibene, G.1, Author
Sartori, R.1, Author
Synakowski, E. J.1, Author
von Hellermann, M. G.1, Author
Zastrow, K. D.3, Author              
Affiliations:
1Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA; UKAEA Euratom Fus Assoc, Abingdon, Oxon, England; Inst Super Tecn, EURATOM, Lisbon, Portugal; Max Planck Inst Plasma Phys, EFDA Close Support Unit, D-8046 Garching, Germany; EURATOM, FOM, Inst Plasma Phys Rijnhuizen, Nieuwegein, Netherlands, ou_persistent22              
2Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
3Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856293              

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 Abstract: First results of gyrokinetic analysis of JET ELMy H mode plasmas are presented. ELMy H mode plasmas form the basis of conservative performance predictions for tokamak reactors of the size of ITER. Relatively high performance for long durations has been achieved and the scaling appears to be favourable. It will be necessary to sustain low Z(eff) and high density for high fusion yield. The article studies the degradation in confinement and the increase in the anomalous heat transport observed in two JET plasmas: one with an intense gas puff and the other with a spontaneous transition from type I to III ELMS at the heating power threshold. Linear gyrokinetic analysis gives the growth rate gamma(lin) of the fastest growing modes. The flow shearing rate gamma(ExB) and gamma(lin) are large near the top of the pedestal. Their ratio decreases approximately at the time when the confinement degrades and the transport increases. This suggests that tokamak reactors may require intense toroidal or poloidal torque input to maintain sufficiently high gamma(ExB)/gamma(lin) near the top of the pedestal for high confinement.

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Language(s): eng - English
 Dates: 2002-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 20205
ISI: 000175213800010
 Degree: -

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Title: Nuclear Fusion
  Alternative Title : Nucl. Fusion
Source Genre: Journal
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Pages: - Volume / Issue: 42 (1) Sequence Number: - Start / End Page: 66 - 75 Identifier: ISSN: 0029-5515