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LHC: news

  1. Jan 1, 2010 #1


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    The following link gives the press release.

    Are there links to the papers that will be published?
    Will they come from different centers or from CERN?

    Will Physic forums use one thread to gather that info?

  2. jcsd
  3. Jan 1, 2010 #2


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    I go here for the news:
    http://lhc.web.cern.ch/lhc/News.htm" [Broken]
    Last edited by a moderator: May 4, 2017
  4. Feb 5, 2010 #3


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    Record-breaking collisions

    Initial results from high-energy proton collisions at the Large Hadron Collider offer first glimpse of physics at new energy frontier.

    Last edited by a moderator: Apr 24, 2017
  5. Feb 6, 2010 #4


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    COLLOQUIUM: The startup of the LHC and the very first collisions in the ATLAS detector

    from 15:15 to 16:15
    at Oscar Klein auditorium

    Speaker : Jonas Strandberg (University of Michigan)

    The last three months have seen the Large Hadron Collider at CERN deliver its first collisions at 900 GeV, and later breaking the world record for the most energetic man-made collisions ever. I will review the excellent progress of the LHC leading up to the successful startup in November last year and give you the latest news and plans for 2010 and beyond.

    With 7 TeV collisions just around the corner, a large new window of opportunity to see physics beyond the Standard Model is opening up. The ATLAS detector has already recorded half a million collision events at 900 GeV which has provided a first look at the detector performance with collision data and has allowed for mass peak reconstructions of several of the lightest hadrons. In anticipation of the high-energy collisions expected this spring I will review the first results coming out of ATLAS during these exciting times, showing that ATLAS is well on its way to take on the search for the Higgs Boson and new physics phenomena such as Supersymmetry.
    Streaming video
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  6. Feb 6, 2010 #5
    Last edited by a moderator: Apr 24, 2017
  7. Feb 6, 2010 #6


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    According to the following, 7 TeV is at least 3 years away:


    Does anybody know what the new/current problems are, if any?

    EDIT: just saw MotoH's post.
  8. Feb 6, 2010 #7
    There aren't any problems right now, just a lot of working to get it up and running. I believe beams start at the end of February. When beams do start, check this out: http://meltronx.com/lhclite/index.html" [Broken] It has a bunch of displays that show how the LHC is running. The display to the top right is the cryogenics, and shows if the cooling units are working, and this is how the 2008 helium leak was discovered by people just watching these.
    Last edited by a moderator: May 4, 2017
  9. Feb 6, 2010 #8


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    Here is a a more intimate look of what was happening

    LHC Commissioning 2009*
    The LHC finished its initial commissioning with beam at 18:00 Wednesday 16th December. Since first beam on Friday 20th November:

    Friday November 20th Injection of both beams - rough RF capture *
    Saturday November 21st Beam 1 circulating - lifetime 10 hours
    Sunday November 22nd Beam 2 circulating - lifetime 3 hours
    Monday November 23rd First pilot collisions at 450 GeV
    First trial ramp (lost 560 GeV - tunes) tune feedback on 1 beam
    Tuesday November 26th Precycle established
    Energy matching between SPS & LHC *
    Sunday November 29th Ramp to 1.07 TeV and then 1.18 TeV (00:43 Monday) Tune PLL commissioned
    Monday 30th November Solenoids on Coupling & orbit compensated
    Tuesday 1st - Sunday 6th December Aperture, collimation and beam dump studies continued - protection qualified to a sufficent level at 450 GeV to allow "stable beams" to be declared. *
    Sunday 6th 06:55 Stable beams at 450 GeV - 4 on 4 pilot intensities Initial struggle with vertical tune
    Tuesday 8th December Ramp 2 on 2 - lost one beam after 3 minutes - but first collisions in Atlas (21:40) at 1.18 TeV No logging - suspect loss due tune swing at end of ramp
    Friday 11th December (01:30) Stable beam collisions at 450 GeV with high bunch intensities: 4 x 2 10^10 per beam *
    Monday 14th December Ramp 2 on 2 to 1.18 TeV - quiet beams - collisons in all four experiments *
    Monday 14th December 16 on 16 at 450 GeV - stable beams *
    Wednesday 16th December Ramped 4 on 4 to 1.18 TeV - squeezed to 7 m in IR5 - collisions in all four experiments Step 1: to collision tunes
Step 2: to 9 m
Step 3: to 7 m
    Wednesday 16th December 18:00 End of run *A nice record of the 26 days courtesy of CMS's e-commentary team.
    Our somewhat fragmented week by week record:
    Week 51
    Week 50**
    Week49 *
    Week48 ***
    Week47 *
  10. Feb 6, 2010 #9


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  11. Feb 11, 2010 #10


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    Doing a search of “CMS Collaboration” should bring out a lot of the papers

    the latest is
    The data were recorded with the Compact Muon Solenoid (CMS) experiment in December 2009 during two 2-hour periods of the LHC commissioning, demonstrating the readiness of CMS in the early phase of LHC operations. The results at √s = 2.36 TeV represent the highest-energy measurements at a particle collider to date.

    there is a discussion/explanation of the paper at Collider Blog
    First CMS Physics Paper!
    You might want to look at some of the links, (on the right of his blog). They might prove to be informative, (Experimenter blog).
  12. Feb 25, 2010 #11


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    Superconductivity: its role, its success and its setbacks in the Large Hadron Collider of CERN
    Lucio Rossi
    CERN, European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland
    Received 7 October 2009
    Published 22 February 2010
    The results of this 20-year-long enterprise will be discussed together with problems faced during construction and commissioning and their remedies. Particular reference is made to the severe incident which occurred nine days after the spectacular start-up of the machine on 10 September 2008. The status of repair and the plan for the physics programme in 2010 are also presented.
    Last edited by a moderator: Apr 24, 2017
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