Compatibility of the Zr-Al alloy with a tokamak plasma environment
We have investigated the compatibility of the Zr-Al alloy bulk getter with a tokamak plasma environment, where the hydrogenic fluxes are sufficient to cause embrittlement in relatively short times. Under normal operating conditions with the getters activated, it is necessary to regenerate the absorbed hydrogenic species before the embrittlement limit is reached. We present a method for determining the loading under tokamak conditions where the Zr-Al surface characteristics can change. During glow discharge cleaning and pulse discharge cleaning, it is not convenient to regenerate. We find, however, that during the cleaning operations the getter self-inerts, thus limiting the loading. We present data and a model which accounts for this behavior in terms of impurity adsorption on the room temperature getter surface during the cleaning operations.
- Research Organization:
- Princeton Univ., NJ (USA). Plasma Physics Lab.
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 5414034
- Report Number(s):
- PPPL-1846; ON: DE82010463
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
ALLOYS
ALUMINIUM ALLOYS
CLEANING
CLOSED PLASMA DEVICES
COMPATIBILITY
ELECTRIC DISCHARGES
EMBRITTLEMENT
GETTERS
GLOW DISCHARGES
HYDROGEN EMBRITTLEMENT
IMPURITIES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
ZIRCONIUM ALLOYS