[time-nuts] Re: 5061A HV Supply, ion pump

[paul swed]

Corby I have exactly seen the behavior you describe. Slowly but surely the
ionize stays on longer and longer till it stays on. I called it a crud
burst. Thanks for the explanation.
Regards
Paul
WB8TSL

On Tue, Nov 15, 2022 at 8:49 PM Corby Dawson via time-nuts <
time-nuts at lists.febo.com> wrote:

> Ed,
>
> The ion pump pumps stray gases not Cesium.
>
> The waste Cesium is absorbed into getter materiel coating the inside
> walls of the tube.
>
> On the older HP tubes there is a small square of carbonized bamboo where
> the waste beam strikes in addition to the gettering on the tube walls.
>
> On a tube that has not operated for a while the stray gases love to dive
> into the ionizer filament and oven filament.
>
> So even though  you might have zero ion pump current in Cs off, when you
> go to operate and the filaments come on they boil off a big puff of gas
> and peg the current. The filaments turn off and the pump pumps the gas
> down till the filaments come on again. This process repeats until the
> filaments are warmed up and have stopped releasing gas. Then the ovens
> will stay on!
>
> Cheers,
>
> Corby
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