Differences

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

--- venting_pumping_lower-dipole_section_venting_pumping_lower-dipole_section [2017/06/13 12:19]
pereira
+++ venting_pumping_lower-dipole_section_venting_pumping_lower-dipole_section [2017/06/22 12:03]
pereira [Pumping analysis-line lower-dipole section]
@@ Line 23: / Line 23: @@
 ===== Pumping analysis-line lower-dipole section =====
-  - Make sure that the manual gate valve is closed (see above).
+  * Make sure that the manual gate valve is closed (see above).
-  - Open **S800vac** PanelMate.
+  * Open PanelMate **S800vac** and go to page 04. Make sure that the venting valve **I225VV** is closed (see last step of the [[#Vent focal-plane chamber|venting process]] described above)
-  - Go to page 4 ("lower beamline dipoles vacuum system, section 16")
+  * Select window **PUMPDOWN STATUS SECTION 16-LOWER DIPOLES** and click on button **START PUMPDOWN**. The **PUMPDOWN STATUS** and **VENT STATUS** windows should display "PUMPDOWN IN PROGRESS"
-  - Select box"PUMPDOWN STATUS SECTION 16-LOWER DIPOLES" and click "START PUMPDOWN". Good vacuum will take few hours.
+       * After the rough valve **I225RV** is automatically open, the mechanical pump will start pumping.
-  - When *I226PG* reads pressures of few mTorr, you can turn on the ion gauge **I225IG**.
+       * The pressures in the mechanical pump (from **I224PG**) and beam chamber (from **I226PG**) will jump momentarily to high pressure values. They should go down slowly after few seconds (otherwise, the chamber is not properly closed).
+       * When pressure in the chamber (from **I226PG**) gets below 100 mTorr (few minuntes), **I225RV** will close. Foreline valve **I225FV** will open followed by the turbo gate valve **I225GV**.
+  * Wait for few hours until vacuum is good. You can then turn on the ion gauge **I225IG**

S800 Documentation

User Tools

Site Tools

Differences

Page Tools