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First Beam: status of LHC commissioning

First Beam: status of LHC commissioning. Eric Prebys Accelerator Physics Center, Fermilab. Unless you’ve been on Mars, you know….

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First Beam: status of LHC commissioning

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  1. First Beam: status of LHC commissioning Eric Prebys Accelerator Physics Center, Fermilab

  2. Unless you’ve been on Mars, you know… • CERN staged the most elaborate media event in the history of physics (history of science?) for the first circulating beam in the LHC on September 10, starting at 8:30AM (CEDT) • Fermilab staged a simultaneous event in the LHC@FNAL Remote Operations Center (ROC) • 1:30 AM (CDT) • -> “Pajama Party” All Experimenters' Meeting

  3. Local Monitoring • Access to LHC eLogBook • Via account logged into CERN network • Full CMS event displays • Local web-based applications accessing data pools at the CERN end • Selected LHC accelerator processes • Java processes running on a PC inside the CERN’s “technical network” • Diplayed via a pipeline tunneled through the CERN unix cluster to a virtual Windows desktop running on a MAC in the ROC (yikes!) • Beam current toroid (not really sensitive enough to see this much beam) • Beam loss monitors (seemed to really bog down the node, so we stopped running it) • BPM display (our primary tool for monitoring beam progress) All Experimenters' Meeting

  4. Generic monitoring: LHC “synoptic display” • “Official” monitor of progress • Hand updated? • Available anywhere via web Progress prior to event (added by me) All Experimenters' Meeting

  5. Close call: the event that almost wasn’t • From the LHC eLogBook: All Experimenters' Meeting

  6. Nevertheless, the party started on schedule All Experimenters' Meeting

  7. Started with beam one (clockwise) at 9:35 • General procedure • Proceed one octant at a time, closing collimators at the next point. • Take several shots to correct beam deviation Beam 1 direction New territory! Beam 2 direction (separate display) All Experimenters' Meeting

  8. Beam seen in CMS All Experimenters' Meeting

  9. Timeline (CEDT) • 9:35 – First beam injected • 9:58 – beam past CMS to point 6 dump • 10:15 – beam to point 1 (ATLAS) • 10:26 – First turn! • …and there was much rejoicing All Experimenters' Meeting

  10. A little slower on Beam 2 • Got 3 turns on beam one • Most people went home • More cryo problems held off beam 2 for a bit • 12:29 – First beam 2 injected • More cryo problems • Some corrector problems at point 6 • 14:59 – First full turn (2:30 hours) All Experimenters' Meeting

  11. Since first beam… • Investigating optics model • Evidence of trim quad polarity problem • Focusing on beam 2 • Captured beam with RF! Matching looks good • ~2 hour lifetimes • First wire scan (flying wire) data • Measured tunes • Increase beam intensity to 5e9 (enough to quench magnets!) • Planned to go back to beam 1, but started having problems with transformer in IP8 • Repaired as of 8:30 this morning, but not yet cold • No beam until ~Wednesday All Experimenters' Meeting

  12. Some plots All Experimenters' Meeting

  13. General plans • Capture beams in both directions • Continue to study beam optics • Work to increase lifetimes • Accelerate beam to ~1TeV • Configuration limit in tunnel must be changed to go higher • Collide beams (450 GeV up to 1 TeV) All Experimenters' Meeting

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