Title: SCALINGS AND PLASMA PROFILE PARAMETERIZATION OF ASDEX HIGH-DENSITY OHMIC DISCHARGES

Author(s): MCCARTHY PJ, RIEDEL KS, KARDAUN OJWF, MURMANN HD, LACKNER K

Source: NUCLEAR FUSION 31 (9): 1595-1633 SEP 1991

Document Type: Article

Language: English

Abstract: A database of high density (0.3 < n(e)BAR[10(20) m-3] < 0.8), low q(a)(1.9 < q(a) < 3.4), Ohmic discharges from the ASDEX experiment is analysed statistically. Bulk parameter scalings and parameterized temperature and density profile shapes are presented. The total plasma kinetic energy, assuming T(i) = T(e), scales as n(e)0.54 +/- 0.01BAR I(p)0.90 +/- 0.04 and is almost independent of the toroidal magnetic field. The electron temperature profile peaking factor scales as T0(3/2)/<T3/2> = 0.94 (+/- 0.04) q(a)1.07 +/- 0.04, in close agreement with the assumption of classical resistive equilibrium. In the inner half of the plasma, the inverse fall-off length for both temperature and density has a strong dependence on q(a), with the temperature dependence being more pronounced. Outside the half-radius, the q(a) dependence disappears, but the density profile broadens near the edge with increasing plasma current. A second database of moderate density, moderate q(a) discharges (0.2 < n(e)BAR/[10(20) m-3] < 0.4, 2.4 < q(a) < 4.2), is presented for comparison.

KeyWords Plus: ENERGY CONFINEMENT; HEATED PLASMAS; CONSISTENCY; JET

Addresses: MCCARTHY PJ (reprint author), EURATOM, IPP, MAX PLANCK INST PLASMAPHYS, GARCHING, GERMANY

Publisher: INT ATOMIC ENERGY AGENCY, WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA

Subject Category: PHYSICS, FLUIDS & PLASMAS; PHYSICS, NUCLEAR

IDS Number: GH663

ISSN: 0029-5515