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gas_handling_system [2013/12/14 16:18] pereira [Removing Gas from Focal Plane Detectors] |
gas_handling_system [2013/12/26 14:53] pereira [Filling CRDC1 and CRDC2 with Gas] |
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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 | ||
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* 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** | ||
+ | * (Check section on [[vacuum control|vacuum control]] for further details.) | ||
==== In the S3 vault ==== | ==== In the S3 vault ==== | ||
* Ensure that the gas handling system roughing pump is running and has a good vacuum | * Ensure that the gas handling system roughing pump is running and has a good vacuum | ||
* The pump sits on the floor under the focal plane behind the south support post | * The pump sits on the floor under the focal plane behind the south support post | ||
- | * The display unit for the pressure at the pump has a needle indicator and is mounted under the focal plane on the south support post | + | * The display unit for the pressure at the pump has a needle indicator and is mounted under the [[Stations# |
- | * Ensure that the main valves on the gas bottles are open | + | * Ensure that the main valves on the gas bottles are open (see pictures below) |
* Ensure that the gas bottles are not empty | * Ensure that the gas bottles are not empty | ||
- | * The gas regulators are not normally adjusted. They should all be set to provide a pressure around 20 psi. | + | * 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 [[Detectors# |
- | * The bottle supplying CF< | + | * The bottle supplying CF< |
- | * 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 in PanelMate **S800vac.MT2 page 07**) 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 5 x 10< |
* 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 |