gas_handling_system
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gas_handling_system [2013/12/13 20:58] pereira created |
gas_handling_system [2013/12/13 21:16] pereira |
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| * 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 | ||
| Line 29: | Line 28: | ||
| - | Preparation of Gas bottles | + | ===== Preparation of Gas bottles |
| - | In Data-U6 | + | ==== In Data-U6 |
| - | 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 only open gas handling system valves are 4, 5, 6, 20, 21, and 22 | + | |
| - | In the S3 vault | + | |
| - | 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 (PICTURE GOES HERE) | + | |
| - | 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 (PICTURE GOES HERE) | + | |
| - | Ensure that the main valves on the gas bottles are open | + | |
| - | Ensure that the gas bottles are not empty | + | |
| - | The gas regulators are not normally adjusted. | + | |
| - | 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 CF4 (tetrafluoromethane) gas for the CRDCs is secured to the cross-brace of the south support for the focal plane chamber. | + | |
| - | The bottle supplying isobutane (C4H10) for the CRDCs is secured to the south support post for the focal plane chamber. | + | |
| - | Filling Ion Chamber | + | ==== In the S3 vault ==== |
| + | * 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 display unit for the pressure at the pump has a needle indicator and is mounted under the focal plane on the south support post | ||
| + | * Ensure that the main valves on the gas bottles are open | ||
| + | * Ensure that the gas bottles are not empty | ||
| + | * The gas regulators are not normally adjusted. | ||
| + | * 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 CF4 (tetrafluoromethane) gas for the CRDCs is secured to the cross-brace of the south support for the focal plane chamber. | ||
| + | * The bottle supplying isobutane (C4H10) for the CRDCs is secured to the south support post for the focal plane chamber. | ||
| - | 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. | ||
| - | 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 | ||
| + | ===== Filling Ion Chamber with Gas ===== | ||
| + | |||
| + | * 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. | ||
| + | |||
| + | * 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** | ||
| Filling CRDC1 and CRDC2 with Gas | Filling CRDC1 and CRDC2 with Gas | ||
gas_handling_system.txt · Last modified: 2023/05/11 11:29 by pereira
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