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gas_handling_system [2013/12/14 16:10] pereira [General Information] |
gas_handling_system [2013/12/26 14:42] pereira [In the S3 vault] |
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* PanelMate **S800vac.MT2 page 07**: Focal Plane Detector | * PanelMate **S800vac.MT2 page 07**: Focal Plane Detector | ||
- | The gas handling systems for both Focal Plane gas-filled detectors – the [[Detectors# | + | 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 | ||
===== LabView Control Program ===== | ===== LabView Control Program ===== | ||
- | To start the gas handling system control application, | + | To start the gas handling system control application, |
* A log file should be specified before operating the gas handling system | * A log file should be specified before operating the gas handling system | ||
* A window automatically pops up asking for the name of the log file when the program starts | * A window automatically pops up asking for the name of the log file when the program starts | ||
- | * Use the number of the current experiment (or “test”) as the name of the log file and save in file / | + | * Use the number of the current experiment (or "test") as the name of the log file and save in file / |
* The On indicator next to Is VI running? will flash until a log file is specified and the program initiates communications with the hardware | * The On indicator next to Is VI running? will flash until a log file is specified and the program initiates communications with the hardware | ||
- | * Click the Valves tab at the top of the LabView window to display the overview of the gas handling system (see Figure below) | + | * Click the **Valves** tab at the top of the LabView window to display the overview of the gas handling system (see Figure below) |
* The triangles on the valve control buttons (as well as the square valve status indicators near the control buttons) are red to indicate that a valve is closed (e.g., control 25 for the CRDC return above) and green to indicate a valve is open (e.g., control 22 for the CRDC bypass above) | * The triangles on the valve control buttons (as well as the square valve status indicators near the control buttons) are red to indicate that a valve is closed (e.g., control 25 for the CRDC return above) and green to indicate a valve is open (e.g., control 22 for the CRDC bypass above) | ||
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==== In Data-U6 ==== | ==== In Data-U6 ==== | ||
- | * Ensure I265GV is closed to isolate focal plane vacuum chamber from the rest of the beamline | + | * Ensure |
* Confirm that the focal plane chamber is under vacuum | * Confirm that the focal plane chamber is under vacuum | ||
* Confirm that the only open gas handling system valves are **4, 5, 6, 20, 21, and 22** | * Confirm that the only open gas handling system valves are **4, 5, 6, 20, 21, and 22** | ||
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* The bottle supplying isobutane (C< | * The bottle supplying isobutane (C< | ||
+ | {{: | ||
+ | {{ : | ||
===== Filling Ion Chamber with Gas ===== | ===== Filling Ion Chamber with Gas ===== | ||
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* Follow instructions under [[# | * Follow instructions under [[# | ||
- | * Monitor the pressure of the focal plane vacuum chamber (as read out via the I264IG ion gauge) while detectors are being filled with gas; 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 in PanelMate **S800vac.MT2 page 07**) while detectors are being filled with gas; the pressure normally stays below 5E-5 Torr. |
* Confirm that the detector pressure as indicated by the display labeled P.T. #1 reads below a couple of Torr | * Confirm that the detector pressure as indicated by the display labeled P.T. #1 reads below a couple of Torr | ||
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* Follow instructions under [[# | * Follow instructions under [[# | ||
- | * Monitor the pressure of the focal plane vacuum chamber (as read out via the I264IG ion gauge) while detectors are being filled with gas; 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 in PanelMate **S800vac.MT2 page 07**) while detectors are being filled with gas; the pressure normally stays below 5E-5 Torr. |
* Confirm that the detector pressure as indicated by the display labeled P.T. #2 reads below a couple of Torr | * Confirm that the detector pressure as indicated by the display labeled P.T. #2 reads below a couple of Torr | ||
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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 in PanelMate **S800vac.MT2 page 07**) 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 | * Ensure that the system is in the normal state for flowing gas through the detectors |