[time-nuts] 4 KV Power Supply Recommendations

J. Forster jfor at quik.com
Sun Jan 17 16:00:28 UTC 2010


The small modules are nice, but many PMT supplies do not go to 5 mA. 5 mA
@ 4 KV is 20 Watts output, more at the input. That's a lot for a PMT
supply.

Also, remember that some supplies designed for gas lasers have a HV "kick"
at startup that may go to 20-30 KV.

-John

==============


>
>> Since it appears to be making some progress, I'd be tempted to just
>> continue. The pump rate of an ion pump varies with the current, so it
>> seems you are pumping, just somewhat more slowly than w/ the external
>> supply, as long as you are not overloading the internal supply.
>>
>> If you don't have a lab supply, get an old transformer from some vaccum
>> tube gear and use the HV secondary to drive a Cockroft-Walton multiplier
>> to get to what you want. Pretty trivial to build these days. Put the
>> primary on a Variac to adjust the voltage.
>>
>> BTW, a commercial supply at that voltage and current is going to cost
>> several hundred dollars.
>
> The nicer Glassman rack-mounted supplies are spendy, but smaller HV
> modules
> for PMT and laser work are common and inexpensive.  Go to eBay and search
> for "<manufacturer> supply", where common manufacturers include Emco,
> Bertan, Spellman, Fluke, and Glassman.  E.g. item 220539685243 .  These
> smaller modules tend to sell for well under $100, and are handy to have
> around.
>
> -- john, KE5FX





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