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          Institute: MPI für Plasmaphysik     Collection: Articles, Books, Inbooks     Display Documents

ID: 20205.0, MPI für Plasmaphysik / Articles, Books, Inbooks
Local physics basis of confinement degradation in JET ELMy H mode plasmas and implications for tokamak reactors
Authors:Budny, R. V.; Alper, B.; Borba, D. N.; Cordey, J. G.; Ernst, D. R.; Giraud, C.; Gowers, C. W.; Gunther, K.; Hahm, T. S.; Hammett, G. W.; Hawkes, N. C.; Horton, L. D.; Saibene, G.; Sartori, R.; Synakowski, E. J.; von Hellermann, M. G.; Zastrow, K. D.
Date of Publication (YYYY-MM-DD):2002-01
Title of Journal:Nuclear Fusion
Journal Abbrev.:Nucl. Fusion
Issue / Number:1
Start Page:66
End Page:75
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E1
External Affiliations:Princeton 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
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