Effect of ELMs on rotation and momentum confinement in H-mode discharges in JET

被引：16

作者：

Versloot, T. W. ^{[1
]}

de Vries, P. C. ^{[1
,2
]}

Giroud, C. ^{[2
]}

Hua, M-D ^{[3
]}

Beurskens, M. N. A. ^{[2
]}

Brix, M. ^{[2
]}

Eich, T. ^{[4
]}

de la Luna, E. ^{[5
]}

Tala, T. ^{[6
]}

Naulin, V. ^{[7
]}

Zastrow, K. D. ^{[2
]}

机构：

[1] FOM, EURATOM Assoc, Inst Rijnhuizen, Nieuwegein, Netherlands

[2] Culham Sci Ctr, CCFE Fus Assoc, EURATOM, Abingdon OX14 3DB, Oxon, England

[3] Univ London Imperial Coll Sci Technol & Med, London SW7 2BY, England

[4] Max Planck Inst Plasma Phys, EURATOM Assoc, D-85748 Garching, Germany

[5] CIEMAT, Asociac EURATOM, Lab Nacl Fus, E-28040 Madrid, Spain

[6] Tekes VTT, EURATOM Assoc, Espoo 02044, Finland

[7] Riso DTU, EURATOM Assoc, Roskilde, Denmark

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2010年 / 52卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

PARTICLE LOSSES; I ELMS; ASDEX UPGRADE; TRANSPORT; ENERGY; JT-60U;

D O I：

10.1088/0741-3335/52/4/045014

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The loss of plasma toroidal angular momentum and thermal energy by edge localized modes (ELMs) has been studied in JET. The analysis shows a consistently larger drop in momentum in comparison with the energy loss associated with the ELMs. This difference originates from the large reduction in angular frequency at the plasma edge, observed to penetrate into the plasma up to r/a similar to 0.65 during large type-I ELMs. As a result, the time averaged angular frequency is lowered near the top of the pedestal with increasing ELM frequency, resulting in a significant drop in thermal Mach number at the edge. An increase in profile peaking of ion temperature and angular frequency is observed. At the same time the plasma confinement is reduced while the ratio of confinement times (R(tau) = tau(E)/tau(phi)) increases noticeably with ELM frequency. This change could be explained by the relatively larger ELM induced losses for momentum in combination with the observed longer build-up time for the momentum density at the plasma edge.

引用

页数：12

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