Material failures observed in Doublet III neutral beamlines

Conference · Thu Dec 01 04:00:00 EST 1983

OSTI ID:7092582

Bailey, E W; Colleraine, A; Doll, D; Grunloh, H; Kim, J; Langhorn, A; Thurgood, B

The Doublet III neutral beam injectors consist of three separable spools two meters in diameter by four meters long overall when assembled. Contained within these spools are the neutralizers, ion dumps, deflecting magnet, calorimeter dumps, cryogenic panels and beam scraping collimators 3,7. To date three beamlines are in operation on Doublet III, and the beams have accumulated operating time of approximately 32 months, with the oldest having been in operation for 18 months. During this time operation of DIII with the neutral beam sources has demonstrated the following: 7.8 MW injected neutrals from three beamlines (6 sources), high ..beta.. (4.5%), and non-circular plasma shape. The sources have also exhibited a very reliable injected shot history 4, 5, 6, 8. Material failures encountered during the operation of DIII N.B. injectors and the solutions to these failures are described. Failures include cracking of the neutralizer exit collimator due to heating cycles, failure of cyropanel support rods due to cooling cycles, failure of the sliding drive of the moveable calorimeter due to friction.

• Research Organization: GA Technologies, Inc., San Diego, CA (USA)
• DOE Contract Number: AT03-76ET51011
• OSTI ID: 7092582
• Report Number(s): GA-A-17203; CONF-831203-164; ON: DE84013557
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700205* -- Fusion Power Plant Technology-- Fuel
Heating
& Injection Systems
BEAM INJECTION
BEAM TRANSPORT
CALORIMETERS
CRACKS
DOUBLET REACTORS
FAILURES
MATERIALS
MEASURING INSTRUMENTS
NEUTRAL ATOM BEAM INJECTION
NEUTRAL BEAM SOURCES
OPERATION
THERMAL CYCLING
THERMONUCLEAR REACTOR MATERIALS
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS