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gas_handling_system [2017/05/14 10:04]
pereira [Filling Ion Chamber with Gas]
gas_handling_system [2018/11/28 09:30] (current)
pereira
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   * PanelMate **S800vac.ui 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#​Ionization Chamber|Ionization Chamber]] and the [[Detectors#​Cathode Readout Drift Chambers (CRDC)|CRDCs]] – are remotely controlled via a single LabView application running on the computer [[Software|S800FP-PC]] in the S3 vault. This computer can be accessed remotely from the desktop of computer [[Software#​u6pc5 (data U6)|u6pc5]],​ by clicking in the icon **S800 Vault PC**, or by typing ''​rdesktop -d NSCL_USER -u s800 -g 1600x1000 ​35.9.56.104''​ from a Linux terminal. Once the virtual session in S800FP-PC is open, the gas handling system can be opened by clicking in the corresponding icon on the desktop **FPGHS_TCPIP-II**. This icon opens the local directory ''​C:/​Users/​s800/​Desktop/​FPGHS_TCPIP-II''​. Once there, run the Labview executable **FPGHS_TCPIP-II.exe** ​+The gas handling systems for both Focal Plane gas-filled detectors – the [[Detectors#​Ionization Chamber|Ionization Chamber]] and the [[Detectors#​Cathode Readout Drift Chambers (CRDC)|CRDCs]] – are remotely controlled via a single LabView application running on the computer [[Software|S800FP-PC]] in the S3 vault. This computer can be accessed remotely from the desktop of computer [[Software#​u6pc5 (data U6)|u6pc5]],​ by clicking in the icon **S800 Vault PC**, or by typing ''​xfreerdp /u:s800 /v:35.9.56.104''​ from a Linux terminal. A terminal will pop-up asking for the s800 password. Once the virtual session in S800FP-PC is open, the gas handling system can be opened by clicking in the corresponding icon on the desktop **FPGHS_TCPIP-II**. This icon opens the local directory ''​C:/​Users/​s800/​Desktop/​FPGHS_TCPIP-II''​. Once there, run the Labview executable **FPGHS_TCPIP-II.exe**
  
 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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       * Ensure **I265GV** is closed (in PanelMate **S800vac.ui 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, 7, 20, 21, 22 and 23**
       * (Check section on [[vacuum control|vacuum control]] for further details.)       * (Check section on [[vacuum control|vacuum control]] for further details.)
  
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            * The display unit for the pressure at the pump has a needle indicator and is mounted under the [[Stations#​Focal Plane Station|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#​Focal Plane Station|focal plane]] on the south support post 
       * 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
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           * Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system           * 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**+  * Close **valves ​6** and **7**
  
   * Open **valve 2**; the flow reading at MFC #1 should jump momentarily   * Open **valve 2**; the flow reading at MFC #1 should jump momentarily
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           * Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system           * Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system
  
-  * Close **valve 22**+  * Close **valves ​22** and **23**
    
   * Open **valves 10 and 15**   * Open **valves 10 and 15**
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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 **AUTO Mode** on left to start filling/​regulation+          * Click button labeled **Update Set Point** 
 +          * Click button labeled **Return to AUTO Mode** on left to start filling/​regulation
           * 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**       * Open **valve 25**
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   * Open **valves 5 and 21**   * Open **valves 5 and 21**
  
-  * **IMPORTANT:** CLOSE **VALVE 25** to protect CRDCs from Ion Chamber pressure+  * **IMPORTANT**: Before opening valve 8 (next step), ​CLOSE **VALVE 25** to protect CRDCs from Ion Chamber pressure
  
   * Empty Ion Chamber to a pressure at or below the pressure of the CRDCs   * Empty Ion Chamber to a pressure at or below the pressure of the CRDCs
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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 main valves ​on [[#​Preparation of gas bottles|gas bottles]]: P-10 for the [[Detectors#​Ionization Chamber|ionization chamber]] (C<​sub>​4</​sub>​H<sub>10</​sub>​) and CF<sub>4</​sub> ​(tetrafluoromethane) for the [[Detectors#​Cathode Readout Drift Chambers (CRDC)|CRDCs]] ​+  * Enter S3 vault and close valves ​downstream of regulators in [[#​Preparation of gas bottles|gas bottles]]: P-10 and CF<​sub>​4</​sub> ​(tetrafluoromethane). Close the main valve for the C<sub>4</​sub>​H<sub>10</​sub> ​bottle.
  
 ===== Tracking Gas bottles pressures ===== ===== Tracking Gas bottles pressures =====
gas_handling_system.1494770686.txt.gz · Last modified: 2017/05/14 10:04 by pereira