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To find the changes of surface compositions during life time of the Scandia-doped impregnated dispenser cathodes, two cathodes have been tested at an activation temperature of 1150 degrees CB-Mo and an operation temperature of 1000 degrees CB-Mo, respectively, in an AES system up to more than 7,000 hours. Surface compositions were monitored in-situ at intervals. The tested results have been reported and discussed in this paper.
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