1 / 13

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….

janna
Télécharger la présentation

First Beam: status of LHC commissioning

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related