LHC stable beams are back

The Large Hadron Collider has reached stable beams again for the first time in about three weeks. The wait has been due to changes in beam parameters needed to take the collider to yet higher luminosities.

The current filling scheme is 150ns_24b_16_16_16_8bpi which means a 150 nano second space between bunches injected in 3 trains of 8 making 24 bunches per beam. There are 16 collisions per turn in each experiment.

Tomorrow, if all goes well,  they will return to 48 bunches to match previous luminosity records before attempting to rapidly increase the luminosity by a further factor of ten in just 1 month.

Update: In fact the next fill will use the scheme 150ns_56b_47_16_47_8bpi. This means they will inject 7 trains with 8 bunches per injection to provide 56 bunches per beam. There will be 47 collisions per turn in CMS, ATLAS and LHCb, and 16 per turn in ALICE. This could give luminosity up to 14/μb/s which would surpass the previous record of 10/μb/s. They expect to inject early tomorrow morning when the current fill will be terminated.


3 Responses to LHC stable beams are back

  1. Luboš Motl says:

    I just wanted to come here and post a happy comment somewhere that would say LHC stable beams are back! ;-)

    http://op-webtools.web.cern.ch/op-webtools/vistar/vistars.php?usr=LHC1

  2. Ervin Goldfain says:

    “Tomorrow, if all goes well, they will return to 48 bunches to match previous luminosity records before attempting to rapidly increase the luminosity by a further factor of ten in just 1 month.”

    Extremely impressive and very exciting!

  3. […] September 20, 2010; “September LHC update,” viXra log, September 22, 2010; “LHC stable beams are back,” September 22, 2010; y “LHC luminosity reaches 20/microbarn/second,” […]

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