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gas_handling_system [2013/12/26 14:49] pereira [In the S3 vault] |
gas_handling_system [2018/04/09 12:05] pereira [Removing Gas from Focal Plane Detectors] |
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====== Detector gas handling system ====== | ====== Detector gas handling system ====== | ||
+ | |||
+ | * [[#General information]] | ||
+ | * [[#LabView Control Program]] | ||
+ | * [[# | ||
+ | * [[#Filling Ion Chamber with Gas]] | ||
+ | * [[#Filling CRDC1 and CRDC2 with Gas]] | ||
+ | * [[#Removing Gas from Focal Plane Detectors]] | ||
+ | * [[#Tracking Gas bottles pressures|Tracking Gas bottles pressures from Barney]] | ||
+ | * [[# | ||
===== General Information ===== | ===== General Information ===== | ||
Required controls and monitoring | Required controls and monitoring | ||
- | | + | * LabView gas handling system |
- | * PanelMate **S800vac.MT2 page 07**: Focal Plane Detector | + | * PanelMate **S800vac.ui 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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* 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. | ||
- | {{:wiki:GasHandlingSystem-panel.jpg? | + | {{:wiki:gas-handling-labview.png? |
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==== In Data-U6 ==== | ==== In Data-U6 ==== | ||
- | * Ensure **I265GV** is closed (in PanelMate **S800vac.MT2 page 07**) to isolate focal plane vacuum chamber from the rest of the beamline | + | * Ensure **I265GV** is closed (in PanelMate **S800vac.ui page 07**) to isolate focal plane vacuum chamber from the rest of the beamline |
* 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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* 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 (see pictures below) | * Ensure that the main valves on the gas bottles are open (see pictures below) | ||
+ | * Open valves downstream of regulators in each bottle | ||
* 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 [[Detectors# | + | * 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< |
{{: | {{: | ||
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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.ui 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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* Click on the tab labeled **Slot 8 (M-card) IC** to access the page with the pressure set point control | * Click on the tab labeled **Slot 8 (M-card) IC** to access the page with the pressure set point control | ||
* Enter the desired pressure (typically 300 Torr) in the field under the knob labeled Set Point | * Enter the desired pressure (typically 300 Torr) in the field under the knob labeled Set Point | ||
+ | * Click button labeled **Update Set Point** | ||
* Click button labeled **Return to AUTO Mode** on left to start filling/ | * Click button labeled **Return to AUTO Mode** on left to start filling/ | ||
* Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system to monitor filling. The flow readings for MFC #1 will increase and eventually disappear as the readout value overflows the display field (this is normal behavior) | * Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system to monitor filling. The flow readings for MFC #1 will increase and eventually disappear as the readout value overflows the display field (this is normal behavior) | ||
- | * If necessary, the filling process can be stopped at any time by pressing the valve button labeled **Close MFC #1** | ||
* Open **valve 9** | * Open **valve 9** | ||
+ | * If necessary, the filling process can be stopped at any time by pressing the valve button labeled **Close MFC #1** | ||
* The filling process will take several minutes | * The filling process will take several minutes | ||
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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 | ||
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* Fill CRDCs | * Fill CRDCs | ||
* Enter the desired fill pressure and start the automatic filling process | * Enter the desired fill pressure and start the automatic filling process | ||
- | * Click the **Zero Sensor** button | ||
* Click on the tab labeled **Virtual Ch. 0 (CRDC)** to access the page with the pressure set point control | * Click on the tab labeled **Virtual Ch. 0 (CRDC)** to access the page with the pressure set point control | ||
* Enter the desired pressure (typically 40 Torr) in the field under the knob labeled **Set Point** | * Enter the desired pressure (typically 40 Torr) in the field under the knob labeled **Set Point** | ||
+ | * Click button labeled **Update Set Point** | ||
* Click button labeled **Return to AUTO Mode** on left to start filling/ | * Click button labeled **Return to AUTO Mode** on left to start filling/ | ||
* Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system to monitor filling. The flow readings for MFC #2 and MFC #3 will increase. The LabView application controls the gas mixing ratio based on the flow ratio (scaled with a calibration constant) | * Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system to monitor filling. The flow readings for MFC #2 and MFC #3 will increase. The LabView application controls the gas mixing ratio based on the flow ratio (scaled with a calibration constant) | ||
+ | * Open **valve 25** | ||
* If necessary, the filling process can be stopped at any time by pressing the valve button labeled **Close MFCs #2 & #3** | * If necessary, the filling process can be stopped at any time by pressing the valve button labeled **Close MFCs #2 & #3** | ||
- | * Open **valve 25** | ||
* The filling process will take several minutes | * The filling process will take several minutes | ||
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* Close **valves 8 and 24** | * Close **valves 8 and 24** | ||
- | * Open **valves 6 and 22** | + | * Open **valves 6, 7, 22 and 23** |
+ | |||
+ | * Enter S3 vault and close valves downstream of regulators in [[# | ||
+ | |||
+ | ===== Tracking Gas bottles pressures ===== | ||
+ | In order to track the status of the gas bottles for the [[Detectors# | ||
- | * Enter vault and close main valves on gas bottles: | ||
+ | {{: | ||
+ | ===== Replacing Gas bottles ===== | ||
+ | In preparation |