Low-recycling conditions and improved core confinement in steady-state operation scenarios in JET (Joint European Torus)

被引：13

作者：

Cesario, R. ^{[1
]}

Amicucci, L. ^{[2
]}

Fonseca, A. ^{[3
]}

Chapman, I. T. ^{[4
]}

Jenko, F. ^{[5
]}

Marinucci, M. ^{[1
]}

Saarelma, S. ^{[4
]}

Smeulders, P. ^{[1
]}

Told, D. ^{[5
]}

Zagorski, R. ^{[6
]}

Baranov, Y. ^{[4
]}

Beurskens, M. ^{[4
]}

De Angelis, R. ^{[1
]}

Mc Donald, D. ^{[4
]}

Challis, C. ^{[3
]}

Galli, A. ^{[2
]}

Mailloux, J. ^{[3
]}

Pericoli, V. ^{[1
]}

Zerbini, M. ^{[1
]}

机构：

[1] Assoc EURATOM ENEA Fusione, Cent Ric Frascati CP 65, I-00044 Frascati, Italy

[2] Univ Roma La Sapienza, Fac Ingn, Rome, Italy

[3] Assoc EURATOM IST Cent Fus Nucl, P-1049001 Lisbon, Portugal

[4] UKAEA EURATOM Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[5] Max Planck IPP, Garching, Germany

[6] EURATOM IPPLM Assoc, Inst Plasma Phys & Laser Microfus, Warsaw, Poland

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

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2013年 / 55卷 / 04期

关键词：

HYBRID CURRENT DRIVE; PERFORMANCE;

D O I：

10.1088/0741-3335/55/4/045005

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：

In this paper, we discuss the phenomena that link particle recycling from the vessel walls in the L-mode during discharge start-up and the core confinement in the H-mode during the subsequent main heating phase. We consider available data of JET experiments that aimed at approaching fully non-inductive ITER-relevant steady-state conditions and show that the high electron temperature produced at the edge by a low recycling during start-up tends to favour the build-up of high normalized beta (beta(N)) regimes in the H-mode, the confinement being improved in a large plasma volume. To provide an insight into this complex phenomenon we have modelled the relation between particle recycling in the scrape-off layer and the evolution of plasma transport, plasma current density and shear as well as the stability properties for such experimental conditions. The results confirm the existence of a link between the confinement in the H-mode phase and the values at the edge of electron temperature, bootstrap current density and local magnetic shear during start-up. Such a link could favour these regimes to be self-sustained in time.

引用

页数：14

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