Measurements of energy and flux of neutrals at the wall in TFTR

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6793875

Wampler, W R; Kilpatrick, S J

The energy and flux of charge-exchange neutral deuterium incident on the wall in TFTR were measured using a carbon resistance probe. This device utilizes the increase in electrical resistance of a thin carbon film produced by the impinging particles. Particle energies and fluxes were determined from the stopping effect of thin layers of silicon over the carbon. Film thicknesses were chosen to give a useful energy range from about 50 to 5000 eV. Time-resolved data were obtained for the first time by using a transient digitizer to record the signals every millisecond during the discharge. The deduced flux and Maxwellian temperature were 0.7 /times/ 10/sup 14//cm/sup 2/s and kT = 350 eV, respectively during ohmic heating. Neutral beam heating (10 MW) increased both the temperature and flux by about a factor of two. The observed flux of neutrals to the wall is large enough for changes in the recycling of these particles to affect plasma fueling significantly. 10 refs., 2 figs., 1 tab.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA); Princeton Univ., NJ (USA). Plasma Physics Lab.
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6793875
• Report Number(s): SAND-88-1257C; CONF-881002-12; ON: DE89001166
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
BEAM INJECTION HEATING
CHARGE EXCHANGE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FIRST WALL
HEATING
NEUTRAL-PARTICLE TRANSPORT
PHYSICAL PROPERTIES
PLASMA HEATING
RADIATION TRANSPORT
TFTR TOKAMAK
THERMONUCLEAR REACTOR WALLS
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS