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installation_fp_sci [2015/05/04 12:23] pereira [Open focal-plane chamber] |
installation_fp_sci [2017/03/06 12:18] pereira [Vent focal-plane chamber] |
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- 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/ | ||
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- After venting the FP chamber, there might still be some pressure differencial. This can be corrected by " | - After venting the FP chamber, there might still be some pressure differencial. This can be corrected by " | ||
- Unlock the padlock protecting the power brakers of the switch controls to open the chamber, and press the **START** button {{: | - Unlock the padlock protecting the power brakers of the switch controls to open the chamber, and press the **START** button {{: | ||
- | - Turn the switch to open the clamps holding the FP chamber {{: | + | - Turn the switch to open the clamps holding the FP chamber. The weight held by the hydraulic piston will increase |
- | - | + | - Turn on the switch to activate the motor opening the chamber. It takes about 10 minutes to get the chamber totally opened {{: |
- | - | + | |
- | - The weight held by the pivot will increase | + | |
+ | ==== Installing FP scintillator ==== | ||
- | Click Vent status [start pumpdown] | + | |
+ | - 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 | ||
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+ | ==== 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 |