1. Open the HV Remote Control GUI and ensure that the focal-plane detectors are unbiased
2. Open the Labview gas handling system and verify that there is no gas in the CRDCs and IC. Open valves 4 (IC supply), 5 (IC bypass), 6 (IC focal-plane bypass), 20 (CRDC supply), 21 (CRDC bypass), and 22 (CRDC focal-plane bypass). The rest of the valves should be closed
3. Ensure that the manual venting valve located on the south side of the chamber is closed (see figures below)
4. Open PanelMate and select S800vac file in directory \\exp\files\control\ncsdata\General\Qt\Templates. Go to page 07, click on the VENT STATUS window and begin the venting procedure. The VENT VALVE I260VV window will turn red and display “OPEN”. The pressure should remain constant because the manual venting valve is still closed
5. Gently open the manual venting valve until the pressure displayed in the Pirani Gauge (see figure below) increases by ~4 torr/min
6. Wait until the chamber is vented (few hours). The I261PG Pirani Gauge should read atmospheric pressure. The window VENT STATUS in PanelMate should display “VENT VALVE OPEN”. The window PUMPDOWN STATUS should display “PUMPDOWN STOPPED”

1. After venting the FP chamber, there might still be some pressure differencial. This can be corrected by “forcing” the chamber flange
2. Unlock the padlock protecting the power brakers of the switch controls to open the chamber, and press the START button
3. Turn the switch to open the clamps holding the FP chamber. The weight held by the hydraulic piston will increase
4. Turn on the switch to activate the motor opening the chamber. It takes about 10 minutes to get the chamber totally opened

1. The figure below shows the FP chamber open, with the “old” FP scintillator to be replaced by the new one
2. Unplug the bases of the up and down phototubes. The tie holding the cable of the up phototube needs to be cut

he first step to do is unplugging the up and down bases of the phototubes

In order to remove the “old” scintillator, we need first to u

Click Vent status [start pumpdown] –> vent status= pumpdown in progress (blue)