Channeling collimation discussion issues

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Channeling collimation discussion issues. Dick Carrigan Fermilab 9th LARP Collaboration Meeting October 17 - 19, 2007 Stanford Linear Accelerator Center. Tevatron channeling projects. E853 – parasitic extraction done in mid nineties – originally in connection with SSC - PowerPoint PPT Presentation

Text of Channeling collimation discussion issues

  • Channeling collimation discussion issues

    Dick CarriganFermilab

    9th LARP Collaboration MeetingOctober 17 - 19, 2007 Stanford Linear Accelerator Center

  • Tevatron channeling projectsE853 parasitic extraction done in mid nineties originally in connection with SSCmost successful, maybe only successful SSC activityPolitics and operational challenges:funding, schedule, demise of SSCtunnel accessTechnical challenges:alignment/goniometerhow to drive parasitic extraction Peggs, stability of loss monitorsChanneling collimation 2005 presentations by Mokhov, Stilldirected toward LHCimportant successes confirms RHIC, shows collimation Operational challenge: running time Technical challenges;alignment/goniometerstability of loss monitors

  • E853 Crystal Extraction at the Tevatronsee Carrigan, Mokhov, et al., Phys. Rev. ST Accel. Beams AB 1, 022801 (1998) http://prstab.aps.org/abstract/PRSTAB/v1/i2/e022801Carrigan, Mokhov, et al., Phys. Rev. ST. Accel. Beams, AB 5, 043501 (2002)http://prst-ab.aps.org/abstract/PRSTAB/v5/i4/e043501(see these for collaborators)

  • E853 history and goalsHistory In early 1990s, proposal for an SSC fixed target B flavor experiment. Crystal proposed for extraction. E853 given $100K to test at Tevatron. Used existing C0 dump not needed at 900 GeV. A location with more dispersion would have helped longitudinal noise excitation

    GoalsExtract 106 protons/s with 1012 circulatingStudy extraction efficiencyShow luminosity lifetime not affectedInvestigate background at CDF and D0

  • E853 SuccessesExtracted significant beams from the Tevatronparasitic, kicked and RF stimulatedFirst ever luminosity-driven extractionHighest energy channeling ever (until recentTevatron collimation studies)Useful collimation studiesExtensive information on time-dependent behaviorVery robust

  • First crystal extraction at the Tevatron C0 straight section June 6, 1995 (kick mode)

  • E853 ExperienceBad:Interaction counters very sensitive to beam motion Extracted beams in the 108 - 109 regime need special instrumentationBeam halo behavior is often non-linearLattice location important (RHIC difficult, Tevatron extraction, collimation better but imperfect)Good:Crystal extraction works well, robustExtraction in diffusion modes means crystal collimation can workMultiple pass works, can take bigger goniometer steps

    Neutral:Large variety of time dependent behavior

  • Channeling collimation studies at the Fermilab Tevatron Dean Still, Jerry Anala, Todd Johnson, Robert Reilly, Dwayne Plant, Dick Carrigan, Sasha Drozhdin, Ray Fliller, Nikolai Mokhov, and Vladimir Shiltzev

    Fermilab

  • Collimator scans for different crystal angles-MokhovChannelReflectionsScatterChanneled beam produces a shoulder 7 + 0.8 mm from the coreThe channeled beam should have been ~10.5 mm from the core.First data set suggested the channeled beam was hitting an aperture.But on 1/10/2006, after moving the crystal 10mm, new data proved there was no aperture limit. Measured deflection ~ 325 rad, not 440 rad.Beam probe w/out crystal

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