Statistical analysis of internal transport barriers in JET

被引：12

作者：

Maget, P ^{[1
]}

Esposito, B

Joffrin, E

Hawkes, N

Mazon, D

Baranov, Y

Fourment, C

Hoang, GT

机构：

[1] CEA, Assoc Euratom, F-13108 St Paul Les Durance, France

[2] ENEA, Assoc Euratom, CR Frascati, Frascati, Italy

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

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2003年 / 45卷 / 08期

关键词：

D O I：

10.1088/0741-3335/45/8/301

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 potential role of magnetic shear, rational safety factor surfaces and shearing rate on the confinement is investigated on the basis of a database analysis of JET internal transport barriers (ITBs). The ITB is quantified using the JET ITB criterion (Tresset G et al 2002 Nucl. Fusion 42 520). The relation between the shearing rate and the magnetic shear, already established for positive magnetic shear barrier (Tala T J J et al 2001 Plasma Phys. Control. Fusion 43 507), is investigated at low and negative magnetic shear, where the threshold in shearing rate is found to be lower than for positive magnetic shear barriers. Defining the ITB from the departure from profile stiffness is found to be consistent with the database results, and the critical gradient length is found to be minimum at low magnetic shear. Finally, ITBs are found to be localized in the vicinity of integer safety factor surfaces in positive magnetic shear plasmas, whereas no correlation is found with integer values when the barrier is localized in negative magnetic shear regions.

引用

页码：1385 / 1398

页数：14

共 53 条

[1] Thermal diffusivities in DIII-D show evidence of critical gradients [J].

Baker, DR ;

Greenfield, CM ;

Burrell, KH ;

DeBoo, JC ;

Doyle, EJ ;

Groebner, RJ ;

Luce, TC ;

Petty, CC ;

Stallard, BW ;

Thomas, DM ;

Wade, MR .

PHYSICS OF PLASMAS, 2001, 8 (09) :4128-4137

[2] Current profile, MHD activity and transport properties of optimized shear plasmas in JET [J].

Baranov, YF ;

Alper, B ;

Cottrell, GA ;

Bartlett, DV ;

Challis, CD ;

Conway, GD ;

Deliyanakis, N ;

Gormezano, C ;

Huysmans, GTA ;

Litaudon, X ;

Parail, VV ;

Sips, ACC ;

Smeulders, P ;

Söldner, FX ;

Tubbing, BJD ;

von Hellermann, MG ;

Ward, DJ .

NUCLEAR FUSION, 1999, 39 (10) :1463-1480

[3] Gyrofluid simulations of turbulence suppression in reversed-shear experiments on the tokamak fusion test reactor [J].

Beer, MA ;

Hammett, GW ;

Rewoldt, G ;

Synakowski, EJ ;

Zarnstorff, MC ;

Dorland, W .

PHYSICS OF PLASMAS, 1997, 4 (05) :1792-1799

[4] Core transport reduction in tokamak plasmas with modified magnetic shear [J].

Bell, MG ;

Bell, RE ;

Efthimion, PC ;

Ernst, DR ;

Fredrickson, ED ;

Levinton, FM ;

Manickam, J ;

Mazzucato, E ;

Schmidt, GL ;

Synakowski, EJ ;

Zarnstorff, MC .

PLASMA PHYSICS AND CONTROLLED FUSION, 1999, 41 :A719-A731

[5] Core poloidal rotation and internal transport barrier formation in TFTR [J].

Bell, RE ;

Levinton, FM ;

Batha, SH ;

Synakowski, EJ ;

Zarnstorff, MC .

PLASMA PHYSICS AND CONTROLLED FUSION, 1998, 40 (05) :609-613

[6] Confinement in W7-AS and the role of radial electric field and magnetic shear [J].

Brakel, R ;

Anton, M ;

Baldzuhn, J ;

Burhenn, R ;

Erckmann, V ;

Fiedler, S ;

Geiger, J ;

Hartfuss, HJ ;

Heinrich, O ;

Hirsch, M ;

Jaenicke, R ;

Kick, M ;

Kuhner, G ;

Maassberg, H ;

Stroth, U ;

Wagner, F ;

Weller, A .

PLASMA PHYSICS AND CONTROLLED FUSION, 1997, 39 :B273-B286

[7] Influence of the q-profile shape on plasma performance in JET [J].

Challis, CD ;

Litaudon, X ;

Tresset, G ;

Baranov, YF ;

Bécoulet, A ;

Giroud, C ;

Hawkes, NC ;

Howell, DF ;

Joffrin, E ;

Lomas, PJ ;

Mailloux, J ;

Mantsinen, MJ ;

Stratton, BC ;

Ward, DJ ;

Zastrow, KD .

PLASMA PHYSICS AND CONTROLLED FUSION, 2002, 44 (07) :1031-1055

[8] Effect of q-profile modification by LHCD on internal transport barriers in JET [J].

Challis, CD ;

Baranov, YF ;

Conway, GD ;

Gormezano, C ;

Gowers, CW ;

Hawkes, NC ;

Hender, TC ;

Joffrin, E ;

Mailloux, J ;

Mazon, D ;

Podda, S ;

Prentice, R ;

Rimini, FG ;

Sharapov, SE ;

Sips, ACC ;

Stratton, BC ;

Testa, D ;

Zastrow, KD .

PLASMA PHYSICS AND CONTROLLED FUSION, 2001, 43 (07) :861-879

[9] Transport in JET deuterium plasmas with optimized shear [J].

Cottrell, GA ;

Baranov, Y ;

O'Brien, D ;

Challis, CD ;

Cordey, JG ;

de Haas, JCM ;

Eriksson, LG ;

Gormezano, C ;

Howman, AC ;

Luce, TC ;

Mantsinen, M ;

Sadler, GJ ;

Sips, ACC ;

Soldner, FX ;

Start, DFH ;

Stubberfield, PM ;

Tubbing, BJT ;

Ward, DJ ;

von Hellermann, M ;

Zwingmann, WP .

PLASMA PHYSICS AND CONTROLLED FUSION, 1998, 40 (07) :1251-1268

[10] Electron thermal transport barrier and magnetohydrodynamic activity observed in Tokamak plasmas with negative central shear [J].

deBaar, MR ;

Hogeweij, GMD ;

Cardozo, NJL ;

Oomens, AAM ;

Schuller, FC .

PHYSICAL REVIEW LETTERS, 1997, 78 (24) :4573-4576

← 1 2 3 4 5 6 →