This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
installation_fp_sci [2015/05/04 12:43] pereira [Installation of FP scintillator] |
installation_fp_sci [2017/03/06 12:17] pereira [Vent focal-plane chamber] |
||
---|---|---|---|
Line 4: | Line 4: | ||
- Open the [[hv_bias|HV Remote Control]] GUI and ensure that the focal-plane detectors are unbiased | - Open the [[hv_bias|HV Remote Control]] GUI and ensure that the focal-plane detectors are unbiased | ||
- Open the [[gas_handling_system# | - Open the [[gas_handling_system# | ||
- | - Ensure that the manual venting valve located on the south side of the chamber is closed (see figures below) | + | - Ensure that the manual venting valve located on the south side of the chamber is closed (see figures below) |
+ | - Ensure that the FP ion gauge (I264IG) is off (see details [[vacuum_control|here]] | ||
- 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 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 " | ||
- Gently open the manual venting valve until the pressure displayed in the Pirani Gauge (see figure below) increases by ~4 torr/ | - Gently open the manual venting valve until the pressure displayed in the Pirani Gauge (see figure below) increases by ~4 torr/ | ||
Line 17: | Line 18: | ||
- | ==== Installation of FP scintillator ==== | + | ==== Installing |
- | - The figure below shows the FP chamber open, with the " | + | |
- | - Unplug the bases of the up and down phototubes. The tie holding the cable of the up phototube needs to be cut | + | |
- | {{: | + | |
+ | - The figure below shows the FP chamber open, with the " | ||
+ | - Unplug the bases of the up and down phototubes. The platic tie holding the cable of the up phototube to the chamber needs to be cut {{: | ||
+ | - Using an allen wrench, unscrew the two bolts attaching the scintillator frame to the base of the chamber {{: | ||
+ | - Climb to the chamber and pull the scintillator frame up. Once unplugged, handle it to a second person {{: | ||
+ | - With the help of a second person, hold the new scintillator by its frame and place it in the right spot. A second person should be ready to screw the frame to the base of the chamber | ||
+ | - Connect the bases of the up and down phototubes. The later is quite difficult because one cannot see the pins | ||
+ | - Using a plastic tie, attach the cable of the up phototube to the scintillator frame | ||
- | he first step to do is unplugging the up and down bases of the phototubes | ||
- | In order to remove the " | ||
- | Click Vent status [start pumpdown] | + | ==== Closing focal-plane chamber |
+ | - Turn the switch to move the chamber to position " | ||
+ | - When the chamber is almost close, turn the know to close the clamps | ||
+ | - Before pumping the chamber down, make sure that the scintillator is properly connected. This can be done by biasing the detector and checking the signals, either from the scalers or with a scope. One should clearly see cosmic rays; if that is not the case, the phototubes are likely miss connected | ||
+ | - In order to pumpdown the chamber, make sure that the manual vent valve is closed. Start manual pump to get a pressure below 50 mtorr {{: | ||
+ | - Close the manual pump; open PanelMate **S800vac** and go to page 07. Select window **PUMPDOWN STATUS** and click on button **START PUMPDOWN**. The **PUMPDOWN STATUS** and **VENT STATUS** windows should display " | ||
+ | - Wait for some hours until vacuum is good |