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installation_fp_sci [2017/06/13 12:10] pereira old revision restored (2017/06/13 12:06) |
installation_fp_sci [2017/06/13 12:19] pereira |
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====== Installation of focal-plane scintillator ====== | ====== Installation of focal-plane scintillator ====== | ||
- | ==== Vent focal-plane chamber ==== | + | ===== Vent focal-plane chamber |
* 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# | ||
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* Wait until the chamber is vented (few hours). The **I261PG** Pirani Gauge should read slightly above atmospheric pressure (due to the dry N2 flow pumped to the chamber). 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 slightly above atmospheric pressure (due to the dry N2 flow pumped to the chamber). The window **VENT STATUS** in PanelMate should display "VENT VALVE OPEN". The window **PUMPDOWN STATUS** should display " | ||
- | ==== Open focal-plane chamber ==== | + | ===== Open focal-plane chamber |
* After venting the FP chamber, the pressure inside the chamber is slightly above atmospheric due to the dry N2 pumped. Before opening the chamber, it is recommended to vent the extra N2 by " | * After venting the FP chamber, the pressure inside the chamber is slightly above atmospheric due to the dry N2 pumped. Before opening the chamber, it is recommended to vent the extra N2 by " | ||
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- | ==== Installing FP scintillator ==== | + | ===== Installing FP scintillator |
* The figure below shows the FP chamber open, with the " | * The figure below shows the FP chamber open, with the " | ||
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- | ==== Closing focal-plane chamber ==== | + | ===== Closing focal-plane chamber |
* Turn the switch to move the chamber to position " | * Turn the switch to move the chamber to position " | ||
* When the chamber is almost close, turn the know to close the clamps | * 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 | * 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 | ||
- | ==== Pumping focal-plane chamber ==== | + | ===== Pumping focal-plane chamber |
* Make sure that the pressure-relief valve (see above) is in place (closed). | * Make sure that the pressure-relief valve (see above) is in place (closed). | ||
* 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 {{: | * 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 " | * 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 | * Wait for some hours until vacuum is good |