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Part of discussion led by Oliver Bruning, CERN Vladimir Shiltsev, LARP/Fermilab

Soft Ranking of LHC Upgrade Possibilities. Part of discussion led by Oliver Bruning, CERN Vladimir Shiltsev, LARP/Fermilab. Factors to be considered. Whether technology available if not – when Cost of the Upgrade <few MEU,<few 10s M,<few 100sM Time to construct & install

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Part of discussion led by Oliver Bruning, CERN Vladimir Shiltsev, LARP/Fermilab

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  1. Soft Ranking of LHC Upgrade Possibilities Part of discussion led by Oliver Bruning, CERN Vladimir Shiltsev, LARP/Fermilab

  2. Factors to be considered • Whether technology available • if not – when • Cost of the Upgrade • <few MEU,<few 10s M,<few 100sM • Time to construct & install • Luminosity gain • Physics risk to not get the gain • e.g. energy deposition, BB, optics LHC Upgrades – O.Bruning, V.Shiltsev

  3. LHC Upgrades – O.Bruning, V.Shiltsev

  4. Thus: • Group A (definetely explore) • all collimator projects • both quad first paths • b-b compensation schemes: W, EL • Group B (carefully look into) • Short bunch and 12.5-75 ns • Dipole first • Crab crossing LHC Upgrades – O.Bruning, V.Shiltsev

  5. “Worth the buck?”: • Tev(RHIC?) rule of thumb: 1M$ upgrade  2-4% in Lumi • Group A • feedback • b-b compensation schemes: W, EL • new collimation schemes • both quad first paths • new 12.5-75ns schemes • Group B (carefully look into) • Short bunch • All IR upgrades LHC Upgrades – O.Bruning, V.Shiltsev

  6. Manager’s View Depends on “Manager’s Model”  assume intelligent manager: • Paranoic – minimize the risk • Assure SOME improvement • Start long lead projects ASAP LHC Upgrades – O.Bruning, V.Shiltsev

  7. LHC Upgrades – O.Bruning, V.Shiltsev

  8. Thus: • Group A (DO NOW) • both quad first paths • Magnet R&D… Magnet R&D…MagnetR&D • Group B (support now , be prepared to do later) • feedback • collimator schemes (RC, LEL, Crystals) • beam-beam compensation schemes • Group C (make sure assumptions/ estimates right, before rule out): • dipole first • short bunches • crab crossing LHC Upgrades – O.Bruning, V.Shiltsev

  9. Possible Action Items (I) • MAGNETS – all has been said already • MARS and Fluka has to agree (resolve ~2 difference) LHC Upgrades – O.Bruning, V.Shiltsev

  10. Possible Action Items (II) • On a way to decision in ~1 yr: • Riccardo to wrap up dipole first analysis • Work with Tanaji (visit FNAL for ~mos) and Ramesh (a week at BNL) • Rama to finish crab cavity analysis • Given Ohmi’s error – reconsider tolerances • Learn from KEK experience • Generate the most attractive proposal • Short bunches so attractive • Make one more inventive/critical look LHC Upgrades – O.Bruning, V.Shiltsev

  11. Possible Action Items (III) • Deeper collaborative look into items promising a lot of return for small investment: • collaboration important as CERN people to be busy with commissioning while “helpers” don’t “feel” the machine well • beam demonstrations most convincing • allow to attract and keep younger scientists interested • Therefore: • Expand beam-beam simulations collaboration on LEL (Ulrich, VS, FZ) LHC Upgrades – O.Bruning, V.Shiltsev

  12. Cont’d • simulate LEL hollow collimator (Rogelio, , FZ, VS) • look into low-noise FB tolerances (??) • crystal collimation design considerations (Walter+LARPies) • full support of BBLR MDs at RHIC and rotating collimators (LARPies) • very low beta* solutions very sesnsitive to vibrations, need to look into tolerances and research vibration levels, including beam screen jitter(Riccardo, Vladimir) LHC Upgrades – O.Bruning, V.Shiltsev

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