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Operating the VELO Vacuum System while being under a neon atmosphere

  • In the following DP refers to the differential pressure between beam and detector volume: DP = p_beam - p_det.
  • When cooling down from room temperature to +10 deg. C with the baseplat hating "ON", DP will increase by approximately 3 mbar.
  • In the following the neon Gas Injection System is supposed to be non-active.
  • In the following a correct reading of the baratron DP is assumed. If not, consult an expert because it then has to be calibrated via a special procedure. This might generate the blowing off of all the CO2 that is inside the cooling system of the VELO !!
  • Make sure the PVSS-project "VEDCS_VacMot" is running under "velo_user" on "vedcs02w". If not, start it and start via "Vision" the panel G:\velo\pvss\VELO_VacuumMotion\panels\VeloVacuum_UI_Main.pnl

Create good starting conditions:

  • If -4.5 < DP < -2.0 mbar, you are lucky and can continue with the paragraph "Operating the vacuum PLC for cooling activities ....". If not, you first have to create a good starting condition, i.e. a good value of DP. This can be done by moving the detector halves. So perform the following actions.
  • bypass the vacuum interlock that prevents moving the detectors. Push the following marked buttons: *

  • screenshot.5.jpg
  • Pull out the red mushroom button on the motion system in motion rack C3B03 at 1m20 from the floor.

Operating the vacuum PLC for cooling activities and powering of VELO-modules while being under a neon atmosphere.

  • If -4.5 < DP < -2.5 mbar, you are lucky and can continue with the next paragraph.

-- EddyJans - 16 Apr 2008

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JPEGjpg screenshot.4.jpg r1 manage 72.6 K 2008-04-16 - 17:26 EddyJans vacuummainpage
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JPEGjpg screenshot.5.jpg r1 manage 66.9 K 2008-04-16 - 17:29 EddyJans bypassinterlock
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Topic revision: r2 - 2008-04-17 - EddyJans
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