Hydrogen isotope trapping on graphite collectors during an isotope exchange experiment in the tokomak fusion test reactor
A rotatable collector probe was used to expose several graphite samples to a deuterium-to-hydrogen-to-deuterium exchange experiment in the Tokamak Fusion Test Reactor (TFTR) at the start of the 1988 operations period. This experiment proved the utility of helium conditioning discharges in accelerating the changeover process. Samples included portions of a tile taken from the inner bumper limiter (POCO AXF-5Q graphite) of TFTR during the recent machine opening, and coupons which had been conditioned in the Plasma Surface Interaction Experimental Facility (PISCES) by exposure to a helium plasma. The samples were exposed to different groups of the /approximately/100 1.4MA discharges that comprised the experiment. They were removed and analyzed for retained deuterium and impurities by nuclear reaction analysis and Rutherford backscattering spectrometry. Codeposited carbon layers had been formed with thicknesses up to several tenths of a micron. The inferred percentages of trapped hydrogenic species were in general agreement with spectroscopic data. The computed carbon fluence per D discharge, 1.2 /times/ 10 X C/cmS, is compared to recent measurements on limiter tiles removed from TFTR. 21 refs., 3 figs., 1 tab.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA); Princeton Univ., NJ (USA). Plasma Physics Lab.
- DOE Contract Number:
- AC04-76DP00789; AC02-76CH03073
- OSTI ID:
- 6477360
- Report Number(s):
- SAND-88-1434C; CONF-881002-43; ON: DE89005601
- Resource Relation:
- Conference: 35. national vacuum symposium and 4th international laser science conference, Atlanta, GA, USA, 2 Oct 1988; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Hydrogen isotope trapping on graphite collectors during an isotope exchange experiment in the Tokamak Fusion Test Reactor
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Related Subjects
HYDROGEN ISOTOPES
TRAPPING
FIRST WALL
GRAPHITE
IMPURITIES
LIMITERS
PLASMA SCRAPE-OFF LAYER
TFTR TOKAMAK
THERMONUCLEAR REACTOR MATERIALS
BOUNDARY LAYERS
CARBON
ELEMENTAL MINERALS
ELEMENTS
ISOTOPES
LAYERS
MATERIALS
MINERALS
NONMETALS
THERMONUCLEAR REACTOR WALLS
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
700201* - Fusion Power Plant Technology- Blanket Engineering