Difference: Vacuum1 (6 vs. 7)

Revision 72008-08-06 - 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.
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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)
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The state "Ready for Beam" is a combination of a several conditions, some of which can be overruled via a so-called "ignore"-action. This can only be done at the PLC-screen and is password protected. So if the vacuum system is not in the state "Ready for Beam" you cannot do much about it. The following information is there to help you to find the cause such that you can better judge what to do and/or who to call. Below it is assumed that no "ignore"-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 PI101<1.0E-1 && PI201<1.0E-1 mbar)
  • PS102=OK && PS202=OK (where OK means among other things PI102<1.0E-1 && PI202<1.0E-1 mbar)
  • PS300=OK (where OK means GV302=closed && PI301<1.0E-3 && PE301<1.0E-6 mbar)
  • PS110=OK && PS210=OK (where OK means PI111<1.0E-3 && PI211<1.0E-3 && PE111<1.0E-4 && PE211<1.0E-4 mbar)
  • PV301, PV302, PV303, PV304, PV305 and SV421 are closed
  • PI411<1.0E-3 && PI412<1.0E-3 mbar
  • PE411<1.0E-6 && PE412<1.0E-6 mbar
  • PI421<1.0E-3 && PI422<1.0E-3 mbar
  • PE421<1.0E-4 && PE412<1.0E-4 mbar
  • operating high voltage of ion getter pumps IP431 and IP441 > 2.5 kV
  • current drawn by ion getter pumps IP431 and IP441 < 1.0E-3 A
 
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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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The actual readings of gauges, valves and pumps can also (partly better) 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. Much more detailed information on the vacuum system can be found in EDMS-901535. See https://edms.cern.ch/document/901535/1
 
screenshot.mainpanel.2.jpg
 
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