Prometheus Fusion Perfection

So I installed the bourdon gauge, which measures down to -100 inches of water, which equals 200 torr. The ion gauge starts at 0.05 torr, roughly 4 orders of magnitude apart.

When I fired up the pump, the bourdon gauge quickly maxed out (and spun another 1/2 revolution past that). Turning the pump off, I did not see any immediate re-pressurization.

I’m going to let it run longer today, see if we can get in range of the ion gauge.

UPDATE

So it’s been running for 11 hours now, and still has not made it to 5e-2 torr.