[Jeff, Ian, Daniel]
We vented the turbo/scroll system on the Laser Filter Cavity (LFC) by turning the knob on the turbo pump. There was a decent amount of air that came in, implying there is a good seal from the turbo to the outside world, even when the scroll and turbo are off. The gate valve was closed and we noticed no pressure increase in the main body of the LFC, implying the gate valve seal is good. We then vented the main body of the LFC with the up-to-air valve. A little turn increased the pressure from 1E-5 Torr to 1 Torr, so one needs to be careful there. I turned the valve a bit more and the pressure slowly increased. Notable, there was a lot of gas sucked into the LFC even when the pressure gauge read "over pressure" (over 760 Torr). I therefore tried to play with the magnet on the pressure gauge once the LFC was fully vented to get the controller to display 760 Torr. Rotating it and moving its z-position didn't accomplish it.
We took off a CF 2.75" to KF50 adapter + a KF50 blank flange and added a 7" long 2.75" CF tube to the all metal angle valve (the latter of which was quite dirty on the flange outside the vacuum ). We needed this 7" long part so that the cup of the Stanford Reserach Systems Residual Gas Analyzer 100 (SRS RGA 100) had room to be inserted into the vacuum system (it needs ~3"). We then connected the SRS RGA to the tube and we tightened the bolts.
I opened up the gate valves and had previously opened the all metal angle valve to the RGA and shut the up-to-air valve and turned on the scroll pump. After 20 minutes, the pressure was 0.1 Torr like before, so I don't think fiddling with the magnet changed anything. I then turned on the turbo (still in soft start mode) around 0.08 Torr. The pressure and power drawn behaved like last time. 20 minutes after turning on the turbo, the pressure is 4.9E-6 Torr.
To use the RGA (and have the turbo controller, which reads out the pressure) talk to the computer, we need some RS232 (male) to USB-A (male) adapers. Ian found this which looks good.
The pressure was 9.8E-7 Torr at 7:42 PM.
The pressure was 1.5E-7 Torr at ~1:40 PM. I turned on the ion pump and the pressure rose to 1E-5 Torr before dropping to 3E-7 Torr in a few minutes with the turbo still on. The pressure topped out around 3.9E-7 Torr before dropping to 3.8E-7 Torr.
Yesterday, we had inserted the electronics control unit (ECU) onto the probe. I tightened the thumb screws to secure it. Since the pressure was 3.3E-7 Torr, I plugged in the ECU's power cord into the power strip. The green light turned on. I also installed the software onto the lab computer in the B111B control room. We don't yet have the RS232 to USB adapter to connect them, so I turned off the RGA and unplugged it.