Bibliographic Citation
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| DOI | http://dx.doi.org/10.1063/1.873013 |
| Title | A computational investigation of divertor plasma scaling laws |
| Creator/Author | Knoll, D.A. [Applied Theoretical and Computational Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] ; Catto, P.J. ; Krasheninnikov, S.I. [MIT Plasma Science and Fusion Center, Cambridge, Massachusetts 02139 (United States)] |
| Publication Date | 1998 Aug 01 |
| OSTI Identifier | OSTI ID: 639076 |
| Other Number(s) | Journal ID: PHPAEN; ISSN 1070-664X; TRN: TRN: 9814M0092 |
| Resource Type | Journal Article |
| Resource Relation | Journal Name: Physics of Plasmas; Journal Volume: 5; Journal Issue: 8; Other Information: PBD: Aug 1998 |
| Subject | 70 PLASMA PHYSICS AND FUSION; TOKAMAK DEVICES; DIVERTORS; PLASMA SIMULATION; SCALING LAWS; HEAT FLUX; IONIZATION; PLASMA CONFINEMENT; THERMONUCLEAR REACTOR WALLS; DESIGN |
| Description/Abstract | Usually, tokamak core scaling laws are written in terms of dimensionless geometrical quantities and parameters corresponding to Coulomb collisionality, gyro-motion, and plasma beta. However, Lackner [K. Lackner, Comments Plasma Phys. Controlled Fusion {bold 15}, 359 (1994)] observed that the temperature profiles also must be the same to obtain the same atomic physics in the divertor region of similar discharges. He obtained a scaling indicating that none of the present tokamaks could be made similar to the International Thermonuclear Experimental Reactor (ITER) [G. Janeschitz {ital et al.}, J. Nucl. Mater. {bold 220{endash}222}, 73 (1995)], but implicitly retained only two body interactions. Subsequent work [P. J. Catto {ital et al.}, Phys. Plasmas {bold 3}, 3191 (1996)] demonstrated that non-two-body effects (multistep radiation, excitation, and ionization processes as well as three body recombination) cannot be ignored for plasma densities above 10{sup 19}thinspm{sup {minus}3}; the regime in which the ITER divertor must operate. In this reactor relevant regime, scaling law information must be obtained experimentally and by complex numerical simulations. To retain and quantify non-two-body effects on scaling laws we employ numerical simulations from a two dimensional box geometry version of the UEDGE code [D. A. Knoll {ital et al.}, Phys. Plasmas {bold 3}, 293 (1996)] which includes a coupled plasma and neutral fluid description retaining non-two-body effects. Results are presented from a numerical investigation into the upstream parallel heat flux divided by upstream pressure scaling, as well as collisionality scaling, of the tokamak divertor target heat flux and ion saturation current. {copyright} {ital 1998 American Institute of Physics.} |
| Country of Publication | United States |
| Language | English |
| Format | Medium: X; Size: pp. 2912-2920 |
| System Entry Date | 2009 Dec 16 |
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