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installation_fp_sci [2017/03/06 12:31] pereira [Installing FP scintillator] |
installation_fp_sci [2017/06/20 17:27] pereira [Pumping focal-plane chamber] |
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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# | ||
* 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]]) | * 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, and ensure that I265GV (gate valve separating FP box from rest of beam line) is closed. |
+ | * 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 ~1 torr every 15 seconds (see figures below) | * 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 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 |
- | * 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 " |
* 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. The weight held by the hydraulic piston will increase {{: | * Turn the switch to open the clamps holding the FP chamber. The weight held by the hydraulic piston will increase {{: | ||
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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 knob to close the clamps |
- | - In order to pumpdown the chamber, make sure that the manual vent valve is closed. | + | |
- | | + | * 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 | ||
+ | * Make sure that the pressure-relief valve and the manual vent valve (see above) are closed. | ||
+ | * Make sure that manual | ||
+ | | ||
+ | * 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 | ||
+ |