Difference: Vacuum1 (5 vs. 6)

Revision 62008-08-05 - EddyJans

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META TOPICPARENT name="VELOOperatingManuals"

Operating the VELO Vacuum System under beam conditions

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  The sector valves VVFSF.33.1L8.X and VVGST.221.1R8.X, that seperate LHCb from LHC, can only be opened by AT-VAC if at least one of the ion pumps IP431/IP441 is on.
The state "Ready for Beam" is a combination of a several conditions, some of which can be overruled at the PLC-screen via a so-called "ignore"-action. Below it is assumed that no overrule actions have been taken. "Ready for Beam" is defined as an AND of the following conditions:
  • PS100=OK && PS200=OK (where OK means among other things that the corresponding Pirani reads < 1.0E-1 mbar)
 The actual readings of gauges, valves and pumps can also be seen at the page named "Vacuum scheme" on the PLC-screen in rack C3B05 on platform C3. To display it, touch the screen once to get rid of the screensaver and then press the encircled button as shown in the figure below.


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