Density peaking in low collisionality ELMy H-mode in JET

被引:39
作者
Valovic, M [1 ]
Budny, R
Garzotti, L
Garbet, X
Korotkov, AA
Rapp, J
Neu, R
Sauter, O
deVries, P
Alper, B
Beurskens, M
Brzozowski, J
McDonald, D
Leggate, H
Giroud, C
Parail, V
Voitsekhovitch, I
机构
[1] UKAEA Euratom Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England
[2] Princeton Univ, PPL, Princeton, NJ 08544 USA
[3] CEA Cadarache, EURATOM Assoc, F-13108 St Paul Les Durance, France
[4] EURATOM, Inst Plasmaphys, Forschungszentrum Julich GmbH, D-52425 Julich, Germany
[5] Max Planck Inst Plasma Phys, EURATOM Assoc, D-85748 Garching, Germany
[6] EURATOM, CRPP Lausanne, EPFL 101, Lausanne, Switzerland
[7] EURATOM, FOM, Inst Plasma Phys, EFDA Assoc, NL-3430 BE Nieuwegein, Netherlands
[8] EFDA, KTH Royal Inst Technol, Stockholm, Sweden
关键词
D O I
10.1088/0741-3335/46/12/006
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
Low collisionality, low particle source. ELMy H-modes (type-III) with sawteeth are produced in JET in order to address the question of density profile evolution in the reference q(95) = 3 ITER scenario. The paper focuses on particle transport in the core zone around the mid-radius. The pedestal region including ELMs and the region affected by sawteeth are not considered. By replacing a significant part of the neutral beam heating by RF power the beam particle flux at mid-radius has been reduced to Gamma(Beam)/n(e) = 0.07 m s(-1). The additional flux due to wall neutrals is estimated as Gamma(Wall)/n(e) = 0.12 m s(-1). Density profiles are found to be modestly peaked under these conditions with a relative density difference of Deltan/(n) = 0.23 across the zone not affected by sawteeth and ELMs. In a region around the mid-radius the ratio of effective particle diffusivity to electron thermal diffusivity is found to be D-e,D-eff/chi(e) approximate to 0.2, which might indicate an anomalous pinch provided the particle diffusivity D-e is sufficiently lame. The measured values of D-e,D-eff/chi(e) are at the lower end of the range used in ITER models.
引用
收藏
页码:1877 / 1889
页数:13
相关论文
共 25 条
[1]   Density peaking, anomalous pinch, and collisionality in tokamak plasmas [J].
Angioni, C ;
Peeters, AG ;
Pereverzev, GV ;
Ryter, F ;
Tardini, G .
PHYSICAL REVIEW LETTERS, 2003, 90 (20) :4-205003
[2]   DEUTERIUM RECYCLING, CONFINEMENT AND LIMITER FLUX IN TFTR [J].
BUDNY, RV .
JOURNAL OF NUCLEAR MATERIALS, 1990, 176 :427-431
[3]   Turbulent particle transport in magnetized plasmas [J].
Garbet, X ;
Garzotti, L ;
Mantica, P ;
Nordman, H ;
Valovic, M ;
Weisen, H ;
Angioni, C .
PHYSICAL REVIEW LETTERS, 2003, 91 (03)
[4]  
GARBET X, 2003, 30 EPS C CONTR FUS P, V27
[5]   Particle transport and density profile analysis of JET plasmas [J].
Garzotti, L ;
Garbet, X ;
Mantica, P ;
Parail, V ;
Valovic, M ;
Corrigan, G ;
Heading, D ;
Jones, TTC ;
Lang, P ;
Nordman, H ;
Pégourié, B ;
Saibene, G ;
Spence, J ;
Strand, P ;
Weiland, J .
NUCLEAR FUSION, 2003, 43 (12) :1829-1836
[6]   The frequently interrupted regime of neoclassical tearing modes (FIR-NTMs):: required plasma parameters and possibilities for its active control [J].
Günter, S ;
Maraschek, M ;
de Baar, M ;
Howell, DF ;
Poli, E ;
Strumberger, E ;
Tichmann, C .
NUCLEAR FUSION, 2004, 44 (04) :524-532
[7]   FLUID EQUATIONS FOR A PARTIALLY-IONIZED PLASMA [J].
HELANDER, P ;
KRASHENINNIKOV, SI ;
CATTO, PJ .
PHYSICS OF PLASMAS, 1994, 1 (10) :3174-3180
[8]  
*ITER, ITER FIN DES REP, P15
[9]  
*ITER, ITER FIN DES REP, P8
[10]  
JANEV RK, 1993, NUCL FUSION S, V4, P79