Collector probe measurements of ohmic conditioning discharges in TFTR
Special limiter conditioning techniques using low density deuterium or helium discharges have produced enhanced plasma confinement in TFTR. Measurements with a rotatable collector probe have been made to increase our understanding of the boundary layer during these conditioning sequences. A set of silicon films behind slits facing in the ion and electron drift directions was exposed to four different D/sup +/ and He/sup 2 +/ discharge sequences. The amounts of deuterium and impurities trapped in the surface regions of the samples have been measured by different analytical techniques, including nuclear reaction analysis for retained deuterium, Rutherford backscattering spectroscopy for carbon and metals, and Auger electron spectroscopy for carbon, oxygen, and metals. Up to 1.9 /times/ 10/sup 17/ cm/sup /minus/2/ of deuterium was detected in codeposited carbon layers with D/C generally in the range of the bulk saturation limit. Radial profiles and ion drift/electron drift asymmetries are discussed. 21 refs., 3 figs., 1 tab.
- Research Organization:
- Princeton Univ., NJ (USA). Plasma Physics Lab.
- DOE Contract Number:
- AC02-76CH03073; AC04-76DP00789
- OSTI ID:
- 6211635
- Report Number(s):
- PPPL-2600; CONF-880512-19; SAND-87-3051C; ON: DE89008962
- Resource Relation:
- Conference: 8. international conference on plasma surface interactions in controlled fusion devices, Julich, F.R. Germany, 2 May 1988; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
Hydrogen isotope trapping on graphite collectors during an isotope exchange experiment in the Tokamak Fusion Test Reactor
Hydrogen isotope trapping on graphite collectors during an isotope exchange experiment in the Tokamak Fusion Test Reactor
Related Subjects
IMPURITIES
CONTROL
TFTR TOKAMAK
PLASMA DIAGNOSTICS
DEUTERIUM
LANGMUIR PROBE
LIMITERS
PLASMA SCRAPE-OFF LAYER
RUTHERFORD SCATTERING
BOUNDARY LAYERS
ELASTIC SCATTERING
ELECTRIC PROBES
HYDROGEN ISOTOPES
ISOTOPES
LAYERS
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
PROBES
SCATTERING
STABLE ISOTOPES
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
700201* - Fusion Power Plant Technology- Blanket Engineering
700102 - Fusion Energy- Plasma Research- Diagnostics