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installation_fp_sci [2017/06/20 17:15]
pereira [Vent focal-plane chamber]
installation_fp_sci [2017/06/22 11:58] (current)
pereira [Pumping focal-plane chamber]
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 {{:​wiki:​fp-pirani.jpg?​350|FP chamber manual venting valve}} ​ {{:​wiki:​fp-pirani.jpg?​350|FP chamber manual venting valve}} ​
   * Wait until the chamber is vented (few hours). The **I261PG** Pirani Gauge should read slightly above atmospheric pressure (due to the dry N2 flow pumped to the chamber). The window **VENT STATUS** in PanelMate should display "VENT VALVE OPEN". The window **PUMPDOWN STATUS** should display "​PUMPDOWN STOPPED"​   * Wait until the chamber is vented (few hours). The **I261PG** Pirani Gauge should read slightly above atmospheric pressure (due to the dry N2 flow pumped to the chamber). The window **VENT STATUS** in PanelMate should display "VENT VALVE OPEN". The window **PUMPDOWN STATUS** should display "​PUMPDOWN STOPPED"​
-  * When the chamber is fully vented, select **VENT STATUS** and click **STOP VENTING PROCEDURE**. This will automatically close the vent valve ***I260VV*+  * When the chamber is fully vented, select **VENT STATUS** and click **STOP VENTING PROCEDURE**. This will automatically close the vent valve **I260VV**
   * Close the manual vent valve   * Close the manual vent valve
  
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 ===== Pumping focal-plane chamber ===== ===== Pumping focal-plane chamber =====
   * Make sure that the pressure-relief valve and the manual vent valve (see above) are closed.   * Make sure that the pressure-relief valve and the manual vent valve (see above) are closed.
-  * Make sure that manual valve of the mechanical pump is opened {{:​wiki:​ManualValve-fp.jpg?​350|Manual valve pump}} +  * Make sure that manual valve of the mechanical pump is opened ​(the valve **I260RV** will be automatically opened in the next step) {{:​wiki:​ManualValve-fp.jpg?​350|Manual valve pump}} 
-  * Open PanelMate **S800vac** and go to page 07. Make sure +  * Open PanelMate **S800vac** and go to page 07. Make sure that the venting valve **I260VV** is closed (see last step of the [[#Vent focal-plane chamber|venting process]] described above)
   * Select window **PUMPDOWN STATUS** and click on button **START PUMPDOWN**. The **PUMPDOWN STATUS** and **VENT STATUS** windows should display "​PUMPDOWN IN PROGRESS"​   * Select window **PUMPDOWN STATUS** and click on button **START PUMPDOWN**. The **PUMPDOWN STATUS** and **VENT STATUS** windows should display "​PUMPDOWN IN PROGRESS"​
-  ​* Wait for some hours until vacuum is good+       * After the rough valve **I260RV** is automatically open, the mechanical pump will start pumping. 
 +       * The pressures in the mechanical pump (from **I259PG**) and beam chamber (from **I261PG**) will jump momentarily to very high values. They should go down slowly after few seconds (otherwise, the chamber is not properly closed). 
 +       * When pressure in the chamber (from **I261PG**) gets below 100 mTorr (at least 30 min), **I260RV** will close. Foreline valve **I260FV** will open followed by the turbo gate valve **I260GV**. 
 +  ​* Wait for few hours until vacuum is good. You can then turn on the ion gauge **I264IG** 
 + 
installation_fp_sci.1497993359.txt.gz · Last modified: 2017/06/20 17:15 by pereira