installation_fp_sci
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installation_fp_sci [2015/05/04 12:55] pereira [Installation of FP scintillator] |
installation_fp_sci [2017/03/06 12:25] pereira [Vent focal-plane chamber] |
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| ==== Vent focal-plane chamber ==== | ==== Vent focal-plane chamber ==== | ||
| + | - After venting the FP chamber, there might still be some pressure differencial. This can be corrected by " | ||
| - 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/min {{: | + | - Gently open the manual venting valve until the pressure displayed in the Pirani Gauge (see figure below) increases by ~1 torr every 15 seconds (see figures below) |
| - 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 " | - 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 " | ||
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| - | ==== Installation of FP scintillator ==== | + | ==== Installing |
| - The figure below shows the FP chamber open, with the " | - 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 {{: | - 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 {{: | ||
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| - Connect the bases of the up and down phototubes. The later is quite difficult because one cannot see the pins | - 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 | - 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 | ||
installation_fp_sci.txt · Last modified: 2023/08/18 10:19 by noji
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