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installation_fp_sci [2017/06/20 17:14] pereira [Closing focal-plane chamber] |
installation_fp_sci [2017/06/20 17:28] 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** | + | * 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 | * Close the manual vent valve | ||
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===== Pumping focal-plane chamber ===== | ===== Pumping focal-plane chamber ===== | ||
* Make sure that the pressure-relief valve and the manual vent valve (see above) are closed. | * Make sure that the pressure-relief valve and the manual vent valve (see above) are closed. | ||
- | * In order to pumpdown the chamber, start manual pump to get a pressure below 50 mtorr {{: | + | * Make sure that manual |
- | * 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 last step of the [[#Vent focal-plane chamber|venting process]] described above) |
+ | * Select window **PUMPDOWN STATUS** and click on button **START PUMPDOWN**. The **PUMPDOWN STATUS** and **VENT STATUS** windows should display " | ||
+ | * The pressures in the mechanical pump (from **I259PG**) and beam chamber (from **I261PG**) will jump momentarily to very high values. They should go down after few seconds | ||
* Wait for some hours until vacuum is good | * Wait for some hours until vacuum is good | ||
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