[time-nuts] Cesium tube ion pumps

[Corby Dawson]

David,

The long storage is not the cause. Extended operation of the ion pump
causes the "whiskers" to grow. They can give rise to field emission
leakage currents.

This manifests as a raised ion pump current but does not inhibit proper
operation unless the current gets too high.

I don't remember at what current a 5071A will shut down at but I can take
a look in the manual.

Corby
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