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installation_fp_sci [2017/06/20 17:28]
pereira [Pumping focal-plane chamber]
installation_fp_sci [2017/06/22 11:58] (current)
pereira [Pumping focal-plane chamber]
Line 48: Line 48:
   * 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)   * 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"​
-  ​* The pressures in the mechanical pump (from **I259PG**) and beam chamber (from **I261PG**) will jump momentarily to very high values. They should go down after few seconds +       * After the rough valve **I260RV** is automatically open, the mechanical pump will start pumping. 
-  * Wait for some hours until vacuum is good+       * 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.1497994105.txt.gz · Last modified: 2017/06/20 17:28 by pereira