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gas_handling_system [2020/03/01 14:50] pereira [Tracking Gas bottles pressures] |
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====== Detector gas handling system ====== | ====== Detector gas handling system ====== | ||
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- | * [[#LabView Control Program for focal plane detectors]] | + | |
* [[# | * [[# | ||
- | * [[#Filling Ion Chamber with Gas]] | ||
- | * [[#Filling CRDC1 and CRDC2 with Gas]] | ||
- | * [[#Removing Gas from Focal Plane Detectors]] | ||
- | * [[Venting/ | ||
* [[#Tracking Gas bottles pressures|Tracking Gas bottles pressures from Barney]] | * [[#Tracking Gas bottles pressures|Tracking Gas bottles pressures from Barney]] | ||
* [[# | * [[# | ||
- | ===== General Information for focal-plane gas handling system ===== | + | ===== General Information for gas handling systems ===== |
- | The gas handling systems | + | |
- | + | ||
- | The Labview software communicates with a MKS gas handling system through a Moax Nport 5110 terminal server attached to the bottom of the focal-plane chamber. This terminal server has a hostname s800ghts.nscl.msu.edu, | + | |
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- | 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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- | Required controls and monitoring | + | |
- | * LabView gas handling system application **FPGHS_TCPIP-II.vi** | + | |
- | * PanelMate **S800vac.ui page 07**: Focal Plane Detector | + | |
- | + | ||
- | ===== LabView Control Program for focal plane detectors ===== | + | |
- | To start the gas handling system control application, | + | |
- | + | ||
- | * The LabView program controls the gas handling system through a Moax terminal server. You have to verify that the address is correct. | + | |
- | * Go to Initialization tab | + | |
- | * Confirm that the IP address is 10.65.40.135 (or s800ghts) and the port number is 2001 | + | |
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- | * 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 | + | |
- | * Use the number of the current experiment (or the date) as the name of the log file and save in the default directory **/ | + | |
- | * 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) | + | |
- | * 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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- | * The gas handling control application should always remain open during the entire time either detector is filled with gas to ensure the log file is continuously updated | + | |
- | + | ||
- | * Once both detectors are empty, this application can be closed with the “X” button on the upper right corner of the window. | + | |
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- | {{: | + | |
+ | The gas handling systems for the gaseous detectors in both intermediate-image and focal-plane boxes are operated remotely through CS studio. Their pages can be found on the EXP network through FRIB EXP Main → S800 → GHS Pages (Secondary Pages). Detailed instructions are found in the following pages: | ||
+ | * [[installation_fp_sci|Venting/ | ||
+ | * [[venting_pumping_intermediate_image_box|Venting/ | ||
===== Preparation of Gas bottles for filling of focal-plane detectors ===== | ===== Preparation of Gas bottles for filling of focal-plane detectors ===== | ||
- | ==== In Data-U6 ==== | + | ==== In Data-U4 ==== |
- | * Ensure **I265GV** is closed | + | * Ensure **RBT_BTS34: |
- | * 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, 7, 20, 21, 22 and 23** | + | |
- | * (Check section on [[vacuum control|vacuum control]] for further details.) | + | |
==== In the S3 vault ==== | ==== In the S3 vault ==== | ||
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- | * 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 | + | * Open valves downstream of regulators in each bottle |
- | * Ensure that the gas bottles are not empty | + | * Ensure that the gas bottles are not empty |
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{{: | {{: | ||
{{: | {{: | ||
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- | ===== Filling Ion Chamber with Gas ===== | ||
- | |||
- | * Follow instructions under [[# | ||
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- | * 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 | ||
- | * 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 | ||
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- | * Close **valves 6** and **7** | ||
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- | * Open **valve 2**; the flow reading at MFC #1 should jump momentarily | ||
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- | * 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 **Update 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) | ||
- | * 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 | ||
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- | * When the detector is filled, close **valve 5** | ||
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- | ===== Filling CRDC1 and CRDC2 with Gas ===== | ||
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- | * Follow instructions under [[# | ||
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- | * 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< | ||
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- | * Confirm that the detector pressure as indicated by the display labeled P.T. #2 reads below a couple of Torr | ||
- | * To zero this display: | ||
- | * Click on the **Slot 4 (PT2)** tab to access the details page for PT #2 | ||
- | * 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 | ||
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- | * Close **valves 22** and **23** | ||
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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 | ||
- | * Enter the desired fill pressure and start the automatic filling process | ||
- | * 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 **Update 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 #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** | ||
- | * The filling process will take several minutes | ||
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- | * When the detector is filled, close **valve 21** | ||
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- | ===== Removing Gas from Focal Plane Detectors ===== | ||
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- | * 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 | ||
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- | * Ensure that the system is in the normal state for flowing gas through the detectors | ||
- | * Confirm that the focal plane chamber is under vacuum | ||
- | * Confirm that **the only open** gas handling system valves are **2, 4, and 9 for the Ion Chamber** and **10, 12, 15, 17, 20, and 25 for the CRDCs** | ||
- | * Confirm that the detector pressures as indicated by the displays labeled P.T. #1 for the Ion Chamber and P.T. #2 for the CRDCs show the correct fill values (typically 300 Torr and 40 Torr, respectively) | ||
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- | * Ensure that I265GV is closed to isolate focal plane vacuum chamber from spectrograph | ||
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- | * Stop the gas flow into both detectors by clicking valve buttons labeled **Close MFC #1** and **Close MFCs #2 & #3** | ||
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- | * Isolate the gas supply by closing **valves 2, 12, 17, 10, and 15** | ||
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- | * Open **valves 5 and 21** | ||
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- | * **IMPORTANT**: | ||
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- | * Empty Ion Chamber to a pressure at or below the pressure of the CRDCs | ||
- | * Open **valve 8** | ||
- | * Wait for the Ion Chamber pressure to reach or drop below the pressure in the CRDCs; this process will take several minutes | ||
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- | * Finish emptying both detectors | ||
- | * Open **valve 25** | ||
- | * Open **valve 24** | ||
- | * Wait for the pressure in both detectors as indicated by the displays labeled P.T. #1 and P.T. #2 to reach 0.5 Torr or less; this process will take at least an hour | ||
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- | * Close **valves 9 and 25** | ||
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- | * Close **valves 8 and 24** | ||
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- | * Open **valves 6, 7, 22 and 23** | ||
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- | * Enter S3 vault and close valves downstream of regulators in [[# | ||
===== Tracking Gas bottles pressures ===== | ===== Tracking Gas bottles pressures ===== |