> 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
