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gas_handling_system [2013/12/13 21:28] pereira |
gas_handling_system [2013/12/14 16:10] 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 [[Detectors# |
Note that since the same roughing pump drives the gas handling systems for both gas-filled detectors, extra precautions must be taken to protect one detector from the pressure of the other detector. The fact that the same pump drives both systems is not indicated on the graphics for the LabView control application | Note that since the same roughing pump drives the gas handling systems for both gas-filled detectors, extra precautions must be taken to protect one detector from the pressure of the other detector. The fact that the same pump drives both systems is not indicated on the graphics for the LabView control application | ||
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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: | ||