Modeling of spectroscopic measurements of edge recycling

Conference · Fri Jan 01 00:00:00 EST 1988

OSTI ID:5045360

Hogan, J; Klepper, C; Hillis, D; Uckan, T

The study of confinement scaling with plasma parameters requires, in general, modeling of the input sources of particles and energy. We investigate modeling issues important for understanding the scaling of particle confinement with density; a scaling which depends on knowledge of the variation of the fuelling profile. By detailed fitting of the poloidal variation of H/sub ..cap alpha../ light from a density scaling sequence of TEXT discharges at fixed B/sub T/ and I/sub p/, we are able to calculate the variation in mean ionisation radius as density is varied for a typical scaling sequence. Variation of several free parameters are required for calculations such as this, so we have examined the feasibility of reducing the number of parameters by modeling velocity-space resolved data. Three dimensional Monte Carlo calculations of the H/sub/alpha// lineshape are presented, including Doppler broadening and Zeeman splitting effects. Many important confinement studies are conducted in 'carbonised' devices. We have studied the problem of determining the fuelling profile in carbon-rich plasmas by calculating the H/sub 0/ deposition due to CH/sub 4/ breakup, and by carrying out experiments in the ORNL Plasma Materials Interaction Test Facility to measure the H/sub ..cap alpha../ lineshape in discharges with CH/sub 4/ injection into pure D/sub 2/ plasmas.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5045360
• Report Number(s): CONF-880512-3; ON: DE88010135
• Resource Relation: Conference: 8. international conference on plasma surface interactions in controlled fusion devices, Julich, F.R. Germany, 2 May 1988
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
TEXT DEVICES
PLASMA DIAGNOSTICS
PLASMA SIMULATION
BEAM INJECTION HEATING
IMPURITIES
MONTE CARLO METHOD
PLASMA CONFINEMENT
CLOSED PLASMA DEVICES
CONFINEMENT
HEATING
PLASMA HEATING
SIMULATION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics
700101 - Fusion Energy- Plasma Research- Confinement
Heating
& Production