Recent results from the HIT-SI experiment

被引：15

作者：

Jarboe, T. R. ^{[1
]}

Akcay, C. ^{[1
]}

Chilenski, M. A. ^{[1
]}

Ennis, D. A. ^{[1
]}

Hansen, C. J. ^{[1
]}

Hicks, N. K. ^{[1
]}

Hosn, R. Z. Aboul ^{[1
]}

Hossack, A. C. ^{[1
]}

Marklin, G. J. ^{[1
]}

Nelson, B. A. ^{[1
]}

O'Neill, R. G. ^{[1
]}

Sieck, P. E. ^{[1
]}

Smith, R. J. ^{[1
]}

Victor, B. S. ^{[1
]}

Wrobel, J. S. ^{[1
]}

Nagata, M. ^{[2
]}

机构：

[1] Univ Washington, Dept Aeronaut & Astronaut, Seattle, WA 98195 USA

[2] Univ Hyogo, Dept Elect Engn & Comp Sci, Himeji, Hyogo 6712201, Japan

来源：

NUCLEAR FUSION | 2011年 / 51卷 / 06期

关键词：

CURRENT DRIVE EXPERIMENTS; INDUCTIVE HELICITY INJECTION; ROTATING MAGNETIC-FIELD; ENERGY CONFINEMENT; SPHEROMAK; TOKAMAK; SUSTAINMENT; RELAXATION; TIME;

D O I：

10.1088/0029-5515/51/6/063029

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：

New understanding and improved parameters have been achieved on the Helicity Injected Torus with Steady Inductive helicity injection current drive (HIT-SI) experiment. The experiment has a bowtie-shaped spheromak confinement region with two helicity injectors. The inductive injectors are 180 degrees segments of a small, oval cross section toroidal pinch. Spheromaks with currents up to 38 kA and current amplification of 2 have been achieved with only 6 MW of injector power. The Taylor-state model is shown to agree with HIT-SI surface and internal magnetic profile measurements. Helicity balance predicts the peak magnitude of toroidal spheromak current and the threshold for spheromak formation. The model also accurately predicts the division of the applied loop voltage between the injector and spheromak regions. Single injector operation shows that the two injectors have opposing, preferred spheromak current directions. An electron locking relaxation model is consistent with the preferred direction, with ion Doppler data and with bolometric data. Results from higher frequency operation are given. The impact of the new understanding on the future direction of the HIT programme is discussed.

引用

页数：15

共 48 条

[1]

BEVIR MK, 1982, P REV FIELD PINCH TH

[2] Structure of the n=1 mode responsible for relaxation and current drive during sustainment of the SPHEX spheromak [J].

Duck, RC ;

Browning, PK ;

Cunningham, G ;

Gee, SJ ;

alKarkhy, A ;

Martin, R ;

Rusbridge, MG .

PLASMA PHYSICS AND CONTROLLED FUSION, 1997, 39 (05) :715-736

[3] THE PLASMA TRANSPORT-EQUATIONS DERIVED BY MULTIPLE TIME-SCALE EXPANSIONS .2. AN APPLICATION [J].

EDENSTRASSER, JW ;

KASSAB, MMM .

PHYSICS OF PLASMAS, 1995, 2 (04) :1206-1216

[4]

Ennis D. A., 2010, Nuclear Fusion, V50, DOI 10.1088/0029-5515/50/7/072001

[5] THEORY OF CURRENT DRIVE IN PLASMAS [J].

FISCH, NJ .

REVIEWS OF MODERN PHYSICS, 1987, 59 (01) :175-234

[6]

Fowler T. K., 1994, Comments on Plasma Physics and Controlled Fusion, V16, P91

[7] Theoretical aspects of energy confinement in spheromaks [J].

Fowler, TK .

FUSION TECHNOLOGY, 1996, 29 (02) :206-209

[8] A NEW LOOK AT DENSITY LIMITS IN TOKAMAKS [J].

GREENWALD, M ;

TERRY, JL ;

WOLFE, SM ;

EJIMA, S ;

BELL, MG ;

KAYE, SM ;

NEILSON, GH .

NUCLEAR FUSION, 1988, 28 (12) :2199-2207

[9] STEADY-STATE SPHEROMAK REACTOR STUDIES [J].

HAGENSON, RL ;

KRAKOWSKI, RA .

FUSION TECHNOLOGY, 1985, 8 (01) :1606-1612

[10] Temperature and density characteristics of the Helicity Injected Torus-II spherical tokamak indicating closed flux sustainment using coaxial helicity injection [J].

Hamp, W. T. ;

Jarboe, T. R. ;

Nelson, B. A. ;

O'Neill, R. G. ;

Raman, R. ;

Redd, A. J. ;

Stewart, B. T. ;

Mueller, D. .

PHYSICS OF PLASMAS, 2008, 15 (08)

← 1 2 3 4 5 →