Prometheus Fusion Perfection

Today I shipped the Glassman power supply back to the manufacturer to be converted to a negative potential and refurbished. I also tested out the second Glassman. It turns on, but I was not registering the expected voltage from the FOCUS output.

The Glassman unit is currently supplying a positive potential, we need a negative potential. The tag on the back panel shows +/- 10kV:

But inside the unit, in the high voltage section is this label:

I’m going to talk to Glassman tech today.

UPDATE:

So I spoke to Glassman tech, and to get a negative potential for this unit I would need to swap out the entire high voltage section with a negative potential version. This power supply likely came with a negative unit, but it was not resold to me. I asked Glassman if they could make a negative unit for me. Might not be possible because the unit is so old.  Should know more soon.

UPDATE 2

Spoke with Bob Glassman. For $370 they can convert the unit to a negative polarity and refurbish it.

Moment of truth today. Tested out the Glassman power-supply. On the bottom is the Glassman, on the top is the high voltage interconnect, the voltage divider, the ground clip, and a voltage meter.

Pretty simple circuit. Here is the schematic for the voltage divider.

When we fire it all the way up we see it metering at 9.97 Volts, which puts the potential at the high voltage very close to +10kV:

So the power supply works, and we’ve had our first excursion with high voltage. We can measure high voltage at least with crude accuracy. I know that as I progress with this project measuring voltages and currents accurately will be a key skill.

So the last piece of the puzzle. According to the label this Glassman is +/- 10kV :

Currently it’s set to a positive potential… we need negative. There is no front panel switch to reverse the polarity. I hope there is some in the box way to switch to a negative potential.