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installation_fp_sci [2017/06/20 10:41] pereira [Vent focal-plane chamber] |
installation_fp_sci [2017/06/20 17:23] pereira [Pumping focal-plane chamber] |
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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 " | ||
+ | * When the chamber is fully vented, select **VENT STATUS** and click **STOP VENTING PROCEDURE**. This will automatically close the vent valve **I260VV** | ||
+ | * Close the manual vent valve | ||
===== Open focal-plane chamber ===== | ===== Open focal-plane chamber ===== | ||
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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 | + | * Check the display indicating the weight lift by the hydraulic system. |
+ | * Turn the knob to close the clamps | ||
+ | * Inspect the clamps and chamber flange (no gaps) to ensure that the chamber is properly sealed | ||
* 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) | + | * Make sure that the pressure-relief |
- | * In order to pumpdown the chamber, make sure that the manual | + | * Make sure that manual valve of the mechanical |
- | * 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 " | + | * Open PanelMate **S800vac** and go to page 07. Make sure that the venting valve **I260VV** is closed (see above) |
+ | * 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 | ||
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+ | should display "VENT VALVE OPEN". The window **PUMPDOWN STATUS** should display " | ||
+ | * When the chamber is fully vented, select **VENT STATUS** and click **STOP VENTING PROCEDURE**. This will automatically close the vent valve **I260VV** | ||
+ | * Close the manual vent valve | ||
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