[time-nuts] thoughts on cesium tube failure modes

Corby Dawson cdelect at juno.com
Mon Dec 1 08:07:13 UTC 2008


John,

You can manually de-gas the ionizer and oven filaments.

It looks like you had already brought the oven up to temp so just work on
the ionizer.

You can bring the voltage up slowly and keep watch on the ion pump
current so it does not get too high.

Once you have got it up to the rated voltage and the pump current is low
you can bring up the oven.

You do not need to provide the RF to test and see if the tube has a
response.

Once you have the oven and ionizer up and running and applied a DC
C-field current, 

(I'd have to look up the current you need), the adjustable mass
spectrometer voltage 

(the ionizer supply floats on this), and the -2000VDC EM voltage you can 
apply a 1/2 zeeman frequency

signal to the flop coil and while adjusting the freq and voltage look for
the peak. Once you see it 

adjust the mass spectrometer voltage (max +18VDC) for a peak.

If you see the peaks during this portion you can then remove the 1/2
zeeman frequency signal

and start trying to input some RF.

Good Luck!

Corby
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