Measurements of the edge current evolution and comparison with neoclassical calculations during MAST H-modes using motional Stark effect

被引：17

作者：

De Bock, M. F. M. ^{[1
]}

Citrin, J. ^{[2
]}

Saarelma, S. ^{[3
]}

Temple, D. ^{[3
]}

Conway, N. J. ^{[3
]}

Kirk, A. ^{[3
]}

Meyer, H. ^{[3
]}

Michael, C. A. ^{[3
]}

机构：

[1] Eindhoven Univ Technol, NL-5600 MB Eindhoven, Netherlands

[2] EURATOM, FOM, FOM Assoc, Inst Plasma Phys Rijnhuizen, NL-3430 BE Nieuwegein, Netherlands

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

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2012年 / 54卷 / 02期

关键词：

ARBITRARY COLLISIONALITY; BOOTSTRAP CURRENT; PEDESTAL; SPECTROSCOPY;

D O I：

10.1088/0741-3335/54/2/025001

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：

Edge localized modes (ELMs), that are present in most tokamak H-(high confinement) modes, can cause significant damage to plasma facing components in fusion reactors. Controlling ELMs is considered necessary and hence it is vital to understand the underlying physics. The stability of ELMs is typically expressed in terms of the pressure gradient del p in the edge and the edge current density j(phi) Both del p and j(phi) are usually derived from profiles fitted to the measured edge density and temperature profiles, where for the calculation of j(phi) neoclassical theory is used. This paper presents direct measurements of the magnetic pitch angle gamma(m) evolution in the edge and the derived j(phi). These provide a method to validate the j(phi) as derived with neoclassical theory and they open up the possibility to find a complete, self-consistent set of edge profiles, that fit density, temperature and gamma(m) measurements, hence allowing for a more accurate stability analysis.

引用

页数：8

共 30 条

[11] Role of neutrals in density pedestal formation in DIII-D [J].

Groebner, RJ ;

Mahdavi, MA ;

Leonard, AW ;

Osborne, TH ;

Porter, GD .

PLASMA PHYSICS AND CONTROLLED FUSION, 2002, 44 :A265-A272

[12] Bootstrap current and neoclassical transport in tokamaks of arbitrary collisionality and aspect ratio [J].

Houlberg, WA ;

Shaing, KC ;

Hirshman, SP ;

Zarnstorff, MC .

PHYSICS OF PLASMAS, 1997, 4 (09) :3230-3242

[13]

Huysmans G.T. A., 1991, PROC CP90 C COMPUTAT, P371

[14]

Jenkins I, 2010, 37 EPS C CONTR FUS P, P2

[15] Enhancement of the Bootstrap Current in a Tokamak Pedestal [J].

Kagan, Grigory ;

Catto, Peter J. .

PHYSICAL REVIEW LETTERS, 2010, 105 (04)

[16]

Keeling DD, 2011, 38 EPS C CONTR FUS P, P2

[17] ELM frequency control by continuous small pellet injection in ASDEX Upgrade [J].

Lang, PT ;

Neuhauser, J ;

Horton, LD ;

Eich, T ;

Fattorini, L ;

Fuchs, JC ;

Gehre, O ;

Herrmann, A ;

Ignácz, P ;

Jakobi, M ;

Kálvin, S ;

Kaufmann, M ;

Kocsis, G ;

Kurzan, B ;

Maggi, C ;

Manso, ME ;

Maraschek, M ;

Mertens, V ;

Mück, A ;

Murmann, HD ;

Neu, R ;

Nunes, I ;

Reich, A ;

Reich, M ;

Saarelma, S ;

Sandmann, W ;

Stober, J ;

Vogl, U .

NUCLEAR FUSION, 2003, 43 (10) :1110-1120

[18] MAGNETIC-FIELD PITCH ANGLE DIAGNOSTIC USING THE MOTIONAL STARK-EFFECT [J].

LEVINTON, FM ;

GAMMEL, GM ;

KAITA, R ;

KUGEL, HW ;

ROBERTS, DW .

REVIEW OF SCIENTIFIC INSTRUMENTS, 1990, 61 (10) :2914-2919

[19] The structure, evolution and role of the radial edge electric field in H-mode and L-mode on MAST [J].

Meyer, H. ;

Bunting, C. ;

Carolan, P. G. ;

Conway, N. J. ;

Dunstan, M. R. ;

Kirk, A. ;

Scannell, R. ;

Temple, D. ;

Walsh, M. .

11TH IAEA TECHNICAL MEETING ON H-MODE PHYSICS AND TRANSPORT BARRIERS, 2008, 123

[20]

Morgan T, 2010, 37 EPS C CONTR FUS P, P5

← 1 2 3 →