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gas_handling_system [2013/12/13 21:06] pereira |
gas_handling_system [2013/12/13 21:28] pereira |
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* Ensure I265GV is closed to isolate focal plane vacuum chamber from the rest of the beamline | * Ensure I265GV is closed 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** |
==== In the S3 vault ==== | ==== In the S3 vault ==== | ||
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+ | ===== Filling Ion Chamber with Gas ===== | ||
- | Filling Ion Chamber with Gas | + | * Follow instructions under [[# |
- | Follow instructions under PREPARATION FOR FILLING DETECTORS WITH GAS above | + | * 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) 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 | + | |
- | To zero this display: | + | |
- | Click on the Slot 3 (PT1) tab to access the details page for PT #1 | + | |
- | Click the Zero Sensor button | + | |
- | Click the Valves tab at the top of the LabView window to return to the overview display of the gas handling system | + | |
- | Close valve 6 | + | |
- | Open valve 2; the flow reading at MFC #1 should jump momentarily | + | |
- | Fill Ion chamber | + | |
- | Enter the desired fill pressure and start the automatic filling process | + | |
- | 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 | + | |
- | 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) | + | |
- | If necessary, the filling process can be stopped at any time by pressing the valve button labeled Close MFC #1 | + | |
- | Open valve 9 | + | |
- | The filling process will take several minutes | + | |
- | When the detector is filled, close valve 5 | + | |
+ | * Confirm that the detector pressure as indicated by the display labeled P.T. #1 reads below a couple of Torr | ||
+ | * To zero this display: | ||
+ | * Click on the **Slot 3 (PT1)** tab to access the details page for PT #1 | ||
+ | * Click the **Zero Sensor** button | ||
+ | * Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system | ||
- | Filling CRDC1 and CRDC2 with Gas | + | * Close **valve 6** |
- | Follow instructions under PREPARATIONS FOR FILLING DETECTORS WITH GAS above | + | * Open **valve 2**; the flow reading at MFC #1 should jump momentarily |
- | 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. | + | |
- | Confirm that the detector pressure as indicated by the display labeled P.T. #2 reads below a couple of Torr | + | * Fill Ion chamber |
- | To zero this display: | + | * Enter the desired fill pressure and start the automatic filling process |
- | Click on the Slot 4 (PT2) tab to access the details page for PT #2 | + | * Click on the tab labeled **Slot 8 (M-card) IC** to access the page with the pressure set point control |
- | Click the Zero Sensor button | + | * Enter the desired pressure (typically 300 Torr) in the field under the knob labeled Set Point |
- | Click the Valves tab at the top of the LabView window to return to the overview display of the gas handling system | + | * Click button labeled **Return to AUTO Mode** on left to start filling/ |
- | Close valve 22 | + | * 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) |
- | Open valves 10 and 15 | + | * If necessary, the filling process can be stopped at any time by pressing the valve button labeled **Close MFC #1** |
- | Open valve 12; the flow reading at MFC #2 should jump momentarily | + | * Open **valve 9** |
- | Open valve 17; the flow reading at MFC #3 should jump momentarily | + | * The filling process will take several minutes |
- | Fill CRDCs | + | |
- | Enter the desired fill pressure and start the automatic filling process | + | * When the detector is filled, close **valve 5** |
- | 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 | + | |
- | 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 | + | ===== Filling CRDC1 and CRDC2 with Gas ===== |
- | 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) | + | * Follow instructions under [[# |
- | 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 | + | |
- | When the detector is filled, close valve 21 | + | * Confirm that the detector pressure as indicated by the display labeled P.T. #2 reads below a couple of Torr |
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+ | * Close **valve 22** | ||
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+ | * Open **valves 10 and 15** | ||
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+ | * Open **valve 12**; the flow reading at MFC #2 should jump momentarily | ||
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+ | * Open **valve 17**; the flow reading at MFC #3 should jump momentarily | ||
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+ | * Fill CRDCs | ||
+ | | ||
+ | * Click the **Zero Sensor** button | ||
+ | * Click on the tab labeled | ||
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+ | * When the detector is filled, close **valve 21** | ||