Nonthermal electrons during sawteeth and disruption instability in tokamaks

被引：19

作者：

Savrukhin, P. V. ^{[1
]}

机构：

[1] IV Kurchatov Atom Energy Inst, Russian Res Ctr, Moscow 123182, Russia

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2006年 / 48卷 / 12B期

关键词：

D O I：

10.1088/0741-3335/48/12B/S19

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：

Bursts of the x-ray and electron cyclotron emission are observed in tokamaks during sawteeth and disruption instability. Analysis of the tangential view x-ray emissivity in the T-10 tokamak has indicated that the bursts are connected with the nonthermal electrons (E-RA similar to 15-150 keV) localized around the magnetic islands. Dynamics of the x-ray bursts are compared with the phenomenologically similar bursts of electron cyclotron emission observed in experiments in TCV (Klimanov I et al 2005 Rev. Sci. Instrum. 76 093504) and DIII-D (Heidbrink W W et al 1999 Nucl. Fusion 39 1369). Analysis of the magnetic field evolution during a sawtooth crash has indicated that the nonthermal electrons can be connected with reconnection of the helical magnetic fluxes around the q = 1 surface. Localization of the bursts around X-points of the magnetic islands and growth of the bursts amplitude in plasma with increased reconnection rate indicated that nonthermal electrons can be connected with direct acceleration in strong electric fields induced during a sawtooth crash. The possible effect of the magnetic reconnection on the generation of the powerful runaway beams during major disruptions is discussed.

引用

页码：B201 / B210

页数：10

共 38 条

[21] FINITE PRESSURE EFFECTS ON SAWTOOTH OSCILLATIONS [J].

PARK, W ;

MONTICELLO, DA ;

FREDRICKSON, E ;

MCGUIRE, K .

PHYSICS OF FLUIDS B-PLASMA PHYSICS, 1991, 3 (03) :507-510

[22] Study of runaway electron generation during major disruptions in JET [J].

Plyusnin, VV ;

Riccardo, V ;

Jaspers, R ;

Alper, B ;

Kiptily, VG ;

Mlynar, J ;

Popovichev, S ;

de la Luna, E ;

Andersson, F .

NUCLEAR FUSION, 2006, 46 (02) :277-284

[23]

PLYUSNIN VV, 2003, 8 IAEA TCM EN PART M

[24]

Porcelli F, 2002, PLASMA PHYS CONTR F, V44, pB389, DOI 10.1088/0741-3335/44/12B/327

[25]

Priest E., 1984, SOLAR MAGNETOHYDRODY

[26] MOTIONAL STARK-EFFECT UPGRADES ON DIII-D [J].

RICE, BW ;

NILSON, DG ;

WROBLEWSKI, D .

REVIEW OF SCIENTIFIC INSTRUMENTS, 1995, 66 (01) :373-375

[27] Role of dispersive waves in collisionless magnetic reconnection [J].

Rogers, BN ;

Denton, RE ;

Drake, JF ;

Shay, MA .

PHYSICAL REVIEW LETTERS, 2001, 87 (19) :1-195004

[28] Theory for avalanche of runaway electrons in tokamaks [J].

Rosenbluth, MN ;

Putvinski, SV .

NUCLEAR FUSION, 1997, 37 (10) :1355-1362

[29] COUPLING OF INTERNAL M=1 AND M=2 MODES AT DENSITY LIMIT DISRUPTIONS IN THE T-10 TOKAMAK [J].

SAVRUKHIN, PV ;

LYADINA, ES ;

MARTYNOV, DA ;

KISLOV, DA ;

POZNYAK, VI .

NUCLEAR FUSION, 1994, 34 (03) :317-336

[30] Effect of the magnetohydrodynamic modes on generation of the nonthermal electrons in high density tokamak plasma [J].

Savrukhin, PV .

PHYSICS OF PLASMAS, 2002, 9 (08) :3421-3428

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