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gas_handling_system [2013/12/13 21:28] pereira |
gas_handling_system [2013/12/14 16:05] pereira [General Information] |
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===== General Information ===== | ===== General Information ===== | ||
Required controls and monitoring | Required controls and monitoring | ||
- | * LabView gas handling system application | + | |
- | * PanelMate S800vac.MT2 page 07: Focal Plane Detector | + | * PanelMate |
The gas handling systems for both Focal Plane gas-filled detectors – the Ion Chamber and the CRDCs – are remotely controlled via a single LabView application running on the computer S800FP-PC in the S3 vault. This computer can be accessed remotely via the devop1 computer in Data-U6. | The gas handling systems for both Focal Plane gas-filled detectors – the Ion Chamber and the CRDCs – are remotely controlled via a single LabView application running on the computer S800FP-PC in the S3 vault. This computer can be accessed remotely via the devop1 computer in Data-U6. | ||
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* Once both detectors are empty, this application can be closed with the “X” button on the upper right corner of the window. | * Once both detectors are empty, this application can be closed with the “X” button on the upper right corner of the window. | ||
- | {{: | + | {{: |
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* Ensure that the main valves on the gas bottles are open | * Ensure that the main valves on the gas bottles are open | ||
* Ensure that the gas bottles are not empty | * Ensure that the gas bottles are not empty | ||
- | * The gas regulators are not normally adjusted. | + | * The gas regulators are not normally adjusted. They should all be set to provide a pressure around 20 psi. |
* The bottle supplying the P-10 gas for the ion chamber is secured to the cross-brace of the south support for the focal plane chamber. | * The bottle supplying the P-10 gas for the ion chamber is secured to the cross-brace of the south support for the focal plane chamber. | ||
- | * The bottle supplying | + | * The bottle supplying |
- | * The bottle supplying isobutane (C4H10) for the CRDCs is secured to the south support post for the focal plane chamber. | + | * The bottle supplying isobutane (C< |
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- | Removing Gas from Focal Plane Detectors | + | ===== Removing Gas from Focal Plane Detectors |
- | Monitor the pressure of the focal plane vacuum chamber (as read out via the I264IG ion gauge) while gas is being removed from detectors; the pressure normally stays below 5E-5 Torr | + | * Monitor the pressure of the focal plane vacuum chamber (as read out via the I264IG ion gauge) while gas is being removed from detectors; the pressure normally stays below 5E-5 Torr |
- | Ensure that the system is in the normal state for flowing gas through the detectors | + | |
- | Confirm that the focal plane chamber is under vacuum | + | * Ensure that the system is in the normal state for flowing gas through the detectors |
- | Confirm that the only open gas handling system valves are 2, 4, and 9 for the Ion Chamber and 10, 12, 15, 17, 20, and 25 for the CRDCs | + | |
- | Confirm that the detector pressures as indicated by the displays labeled P.T. #1 for the Ion Chamber and P.T. #2 for the CRDCs show the correct fill values (typically 300 Torr and 40 Torr, respectively) | + | |
- | Ensure that I265GV is closed to isolate focal plane vacuum chamber from spectrograph | + | |
- | Stop the gas flow into both detectors by clicking valve buttons labeled Close MFC #1 and Close MFCs #2 & #3 | + | |
- | Isolate the gas supply by closing valves 2, 12, 17, 10, and 15 | + | * Ensure that I265GV is closed to isolate focal plane vacuum chamber from spectrograph |
- | Open valves 5 and 21 | + | |
- | IMPORTANT: | + | * Stop the gas flow into both detectors by clicking valve buttons labeled |
- | Empty Ion Chamber to a pressure at or below the pressure of the CRDCs | + | |
- | Open valve 8 | + | * Isolate the gas supply by closing |
- | Wait for the Ion Chamber pressure to reach or drop below the pressure in the CRDCs; this process will take several minutes | + | |
- | Finish emptying both detectors | + | * Open **valves 5 and 21** |
- | Open valve 25 | + | |
- | Open valve 24 | + | * **IMPORTANT:** CLOSE **VALVE 25** to protect CRDCs from Ion Chamber pressure |
- | Wait for the pressure in both detectors as indicated by the displays labeled P.T. #1 and P.T. #2 to reach 0.5 Torr or less; this process will take at least an hour | + | |
- | Close valves 9 and 25 | + | * Empty Ion Chamber to a pressure at or below the pressure of the CRDCs |
- | Close valves 8 and 24 | + | |
- | Open valves 6 and 22 | + | |
- | Enter vault and close main valves on gas bottles: | + | |
+ | * Finish emptying both detectors | ||
+ | | ||
+ | | ||
+ | | ||
+ | |||
+ | * Close **valves 9 and 25** | ||
+ | |||
+ | * Close **valves 8 and 24** | ||
+ | |||
+ | * Open **valves 6 and 22** | ||
+ | |||
+ | * Enter vault and close main valves on gas bottles: | ||