Ion microanalysis and implantation applied to fusion surface research

Conference · Sun Jan 01 04:00:00 EST 1978

OSTI ID:6425027

Vook, F L; Doyle, B L; Picraux, S T

Ion microanalysis and implantation have been used to investigate and analyze plasma-surface interactions relevant to fusion plasma materials. Previous results for pure metals are reviewed and new results are presented for TiB/sub 2/ coatings for Tokamak surfaces. Enhanced trapping of implanted, low-energy hydrogen has been shown to occur at room temperature in W, Au, Pd, Mo, Nb, and TiB/sub 2/ for He or other ion predamage. Hydrogen depth profiles obtained using /sup 1/H(/sup 19/F,..cap alpha gamma..)/sup 16/O resonant nuclear reaction show that the H decorates the He damage profiles at traps whose concentration is proportional to the He-induced damage. For room temperature implantation in TiB/sub 2/, H is trapped at the end of range, and isochronal annealing indicates that the H is lost by release from traps followed by rapid diffusion. For He predamaged samples, annealing at 400/sup 0/C causes the H to be retrapped in the region of the He-induced damage at traps whose cross section is approx. = 1.8 x 10/sup -18/cm/sup 2//trap.

• Research Organization: Sandia Labs., Albuquerque, NM (USA)
• DOE Contract Number: EY-76-C-04-0789
• OSTI ID: 6425027
• Report Number(s): SAND-78-1585C; CONF-781113-21
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
ALLOYS
BACKSCATTERING
BORON ALLOYS
CLOSED PLASMA DEVICES
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
ELEMENTS
FIRST WALL
FLUIDS
GOLD
HELIUM IONS
HYDROGEN
IMPURITIES
ION IMPLANTATION
LEAD
METALS
MICROSTRUCTURE
MOLYBDENUM
NIOBIUM
NONMETALS
REFRACTORY METALS
SCATTERING
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTOR WALLS
TITANIUM ALLOYS
TOKAMAK DEVICES
TRANSITION ELEMENTS
TUNGSTEN