Differences

This shows you the differences between two versions of the page.

--- installation_fp_sci [2017/06/20 17:28]
pereira [Pumping focal-plane chamber]
+++ installation_fp_sci [2017/06/22 11:58]
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)
   * 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**

S800 Documentation