ELM frequency feedback control on JET

被引：22

作者：

Lennholm, M. ^{[1
,2
,9
,10
]}

Beaumont, P. S. ^{[3
,8
]}

Carvalho, I. S. ^{[4
,7
]}

Chapman, I. T. ^{[3
,8
]}

Felton, R. ^{[3
,8
]}

Frigione, D. ^{[5
,6
]}

Garzotti, L. ^{[3
,8
]}

Goodyear, A. ^{[3
,8
]}

Graves, J.

Grist, D. ^{[3
,8
]}

Jachmich, S. ^{[2
,8
,9
]}

Lang, P.

Lerche, E. ^{[3
]}

de la Luna, E.

Mooney, R. ^{[3
,8
]}

Morris, J. ^{[3
,8
]}

Nave, M. F. F. ^{[7
]}

Rimini, F. ^{[3
,8
]}

Sips, G. ^{[1
,2
,9
,10
]}

Solano, E. ^{[2
,8
,9
]}

Tsalas, M. ^{[3
,11
]}

机构：

[1] Culham Sci Ctr, JET EFDA, Abingdon OX14 3DB, Oxon, England

[2] Commiss European Communities, B-1049 Brussels, Belgium

[3] Culham Sci Ctr, EFDA Close Support Unit, Abingdon OX14 3DB, Oxon, England

[4] CCFE, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[5] Univ Lisbon, Inst Super Tecn, Inst Plasmas & Fusao Nucl, P-1049001 Lisbon, Portugal

[6] ENEA, CR Frascati, Rome, Italy

[7] Ecole Polytech Fed Lausanne, Assoc EURATOM Conferat Suisse, CRPP, CH-1015 Lausanne, Switzerland

[8] Koninklijke Militaire School Ecole Royale Militai, Plasma Phys Lab, B-1000 Brussels, Belgium

[9] Max Planck Inst Plasma Phys, D-85748 Garching, Germany

[10] CIEMAT, Lab Nacl Fus, E-28040 Madrid, Spain

[11] FOM Inst DIFFER, NL-3430 BE Nieuwegein, Netherlands

来源：

NUCLEAR FUSION | 2015年 / 55卷 / 06期

关键词：

ELMs; feedback control; impurity control; tokamak experiments; pellet injection; EDGE LOCALIZED MODES; H-MODE; ACTIVE CONTROL; ASDEX UPGRADE; I ELMS; PLASMAS; CONFINEMENT; STABILITY; LOSSES; ENERGY;

D O I：

10.1088/0029-5515/55/6/063004

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：

This paper describes the first development and implementation of a closed loop edge localized mode (ELM) frequency controller using gas injection as the actuator. The controller has been extensively used in recent experiments on JET and it has proved to work well at ELM frequencies in the 15-40 Hz range. The controller responds effectively to a variety of disturbances, generally recovering the requested ELM frequency within approximately 500 ms. Controlling the ELM frequency has become of prime importance in the new JET configuration with all metal walls, where insufficient ELM frequency is associated with excessive tungsten influx. The controller has allowed successful operation near the minimum acceptable ELM frequency where the best plasma confinement can be achieved. Use of the ELM frequency controller in conjunction with pellet injection has enabled investigations of ELM triggering by pellets while maintaining the desired ELM frequency even when pellets fail to trigger ELMs.

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