[time-nuts] Maser info (vacuum levels)

Corby Dawson cdelect at juno.com
Thu Sep 2 17:28:12 UTC 2010

This EFOS maser typically runs with the two vacuum pressures below 1.5 X
10-6 Torr. (as measured via the ion pump current)

Maximum should not exceed about 3.6 X 10-6 Torr for either pump.

The internal vacuum will drop to about 1 X10-7 Torr if the Hydrogen to
the disassociator is turned off.

One pump pumps the "internal" which is the maser bulb, the disassociator,
and the connecting lines, so mainly just pumps Hydrogen. (fairly low

The "external" pump pumps the insulating outer shell and the interior of
the maser cavity. It pumps any leakage or outgassing that occurs. (much
larger volume)

Pumps are 20 LPS varian triodes.

Corby Dawson
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