Volume recombination and opacity in Alcator C-Mod divertor plasmas

被引：148

作者：

Terry, JL

Lipschultz, B

Pigarov, AY

Krasheninnikov, SI

LaBombard, B

Lumma, D

Ohkawa, H

Pappas, D

Umansky, M

机构：

[1] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

[2] IV Kurchatov Atom Energy Inst, Moscow 123182, Russia

[3] Coll William & Mary, Williamsburg, VA USA

来源：

PHYSICS OF PLASMAS | 1998年 / 5卷 / 05期

关键词：

D O I：

10.1063/1.872845

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：

Volume recombination within the Alcator C-Mod [I. H. Hutchinson et al., Phys. Plasmas 1, 1511 (1994)] divertor plasma is measured and found to be a significant fraction of the total ion sink under detached divertor conditions. The recombination occurs in regions where T-e similar to leV and n(3) similar to 10(21)m(-3). Measurements of the spatial distribution of the recombination are presented. The determinations of the recombination rates are made by measuring the D-0 Balmer spectrum and by using a collisional radiative model describing the level populations, ionization, and recombination of D-0. The concept of "recombinations per Balmer series photon" is developed to simplify the determinations. Measurements of the opacity of Ly(beta) emission are presented. It is observed that up to 50% of the Ly(beta) emission is trapped, indicating that Ly(alpha) is strongly trapped in some cases. The effects of Ly(alpha,beta) trapping on the "recombinations per photon" curves are calculated and considered in the recombination rate determinations. Observations indicating the presence of molecular activated recombination are discussed. (C) 1998 American Institute of Physics.

引用

页码：1759 / 1766

页数：8

共 33 条

[1] First measurements of electron temperature and density with divertor Thomson scattering in radiative divertor discharges on DIII-D [J].

Allen, SL ;

Hill, DN ;

Carlstrom, TN ;

Nilson, DG ;

Stockdale, R ;

Hsieh, CL ;

Petrie, TW ;

Leonard, AW ;

Ryutov, D ;

Porter, GD ;

Maingi, R ;

Wade, MR ;

Cohen, R ;

Nevins, W ;

Fenstermacher, ME ;

Wood, RD ;

Lasnier, CJ ;

West, WP ;

Brown, MD .

JOURNAL OF NUCLEAR MATERIALS, 1997, 241 :595-601

[2]

BEHRINGER K, 1997, COMMUNICATION

[3] Study of recombining gas targets [J].

Borrass, K ;

Coster, D ;

Reiter, D ;

Schneider, R .

JOURNAL OF NUCLEAR MATERIALS, 1997, 241 :250-254

[4] Experimental observations of steep temperature steps in dense magnetized plasmas [J].

Chiu, GS ;

Cohen, SA .

PHYSICAL REVIEW LETTERS, 1996, 76 (08) :1248-1251

[5]

EZUMI N, 1997, P 24 EUR PHYS SOC C, V21, P1225

[6] The two-dimensional structure of radiative divertor plasmas in the DIII-D Tokamak [J].

Fenstermacher, ME ;

Allen, SL ;

Brooks, NH ;

Buchenauer, DA ;

Carlstrom, TN ;

Cuthbertson, JW ;

Doyle, EJ ;

Evans, TE ;

Garbet, PM ;

Harvey, RW ;

Hill, DN ;

Hyatt, AW ;

Isler, RC ;

Jackson, G ;

James, RA ;

Jong, R ;

Klepper, CC ;

Lasnier, CJ ;

Leonard, AW ;

Mahdavi, MA ;

Maingi, R ;

Meyer, WH ;

Moyer, RA ;

Nilson, DG ;

Petrie, TW ;

Porter, GD ;

Rhodes, TL ;

Schaffer, MJ ;

Stambaugh, RD ;

Thomas, DM ;

Tugarinov, S ;

Wade, MR ;

Watkins, JG ;

West, WP ;

Whyte, DG ;

Wood, RD .

PHYSICS OF PLASMAS, 1997, 4 (05) :1761-1773

[7] NEW DENSITY DIAGNOSTIC METHOD BASED ON EMISSION-LINE INTENSITY RATIO OF NEUTRAL HYDROGEN IN AN IONIZING PHASE PLASMA [J].

FUJIMOTO, T ;

MIYACHI, S ;

SAWADA, K .

NUCLEAR FUSION, 1988, 28 (07) :1255-1263

[8] 1ST RESULTS FROM ALCATOR-C-MOD [J].

HUTCHINSON, IH ;

BOIVIN, R ;

BOMBARDA, F ;

BONOLI, P ;

FAIRFAX, S ;

FIORE, C ;

GOETZ, J ;

GOLOVATO, S ;

GRANETZ, R ;

GREENWALD, M ;

HORNE, S ;

HUBBARD, A ;

IRBY, J ;

LABOMBARD, B ;

LIPSCHULTZ, B ;

MARMAR, E ;

MCCRACKEN, G ;

PORKOLAB, M ;

RICE, J ;

SNIPES, J ;

TAKASE, Y ;

TERRY, J ;

WOLFE, S ;

CHRISTENSEN, C ;

GARNIER, D ;

GRAF, M ;

HSU, T ;

LUKE, T ;

MAY, M ;

NIEMCZEWSKI, A ;

TINIOS, G ;

SCHACHTER, J ;

URBAHN, J .

PHYSICS OF PLASMAS, 1994, 1 (05) :1511-1518

[9] Signatures of deuterium recombination in the DIII-D divertor [J].

Isler, RC ;

McKee, GR ;

Brooks, NH ;

West, WP ;

Fenstermacher, ME ;

Wood, RD .

PHYSICS OF PLASMAS, 1997, 4 (08) :2989-2996

[10] SURVEY OF ATOMIC PROCESSES IN EDGE PLASMAS [J].

JANEV, RK ;

POST, DE ;

LANGER, WD ;

EVANS, K ;

HEIFETZ, DB ;

WEISHEIT, JC .

JOURNAL OF NUCLEAR MATERIALS, 1984, 121 :10-16

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