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LARP Summary

LARP Summary. Eric Prebys , Fermilab Director, LARP. BNL Cavity Status and Plan for 2012-2013. The design of the cavity is complete. Fabrication of the cavity with stiffening frame is in progress. We expect the fabrication to be complete at the end of calendar year 2012.

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LARP Summary

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  1. LARP Summary Eric Prebys, Fermilab Director, LARP

  2. BNL Cavity Status and Plan for 2012-2013 • The design of the cavity is complete. • Fabrication of the cavity with stiffening frame is in progress. • We expect the fabrication to be complete at the end of calendar year 2012. • Chemistry and HPR will be done right after the fabrication of the cavity. • Vertical testing, first without HOM couplers then with HOM couplers will be carried out through early 2013. • The testing will be focused on • Deflection voltage • HOMs • Peak fields • Possible multipacting Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  3. ODU Cavity: Status and Plan • Development of compact deflecting/crabbing cavities was in response to the strict dimensional requirements in some current applications • Compact rf-dipole design has • Low and balanced surface fields • High shunt impedance • Has no lower-order-mode with a well-separated fundamental mode • Work in progress • 499 MHz deflecting cavity • Fabrication will be completed by Nov-Dec • 400 MHz crabbing cavity • Preparation for processing • Bulk BCP – Fixtures and parts are being fabricated for both cavities (Nov-Dec) • 750 MHz crabbing cavity • Cavity processed with bulk BCP of 150 μm • Tests under way Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  4. Key Crab Cavity Points • CERN is solidly behind crab cavity development and is supporting the SPS test and working to resolve open issues. • Lots of details on SPS test, which I don’t have time to show • LARP’s role in crab cavities is one of the big issues for long term project planning. • Next big step: cryomodule integration workshop at Fermilab in December Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  5. SPS Test Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  6. Rotatable Collimator Summary • Complete rotating collimator of April 2011 worked fairly well but fragility of 1.5mm wall copper cooling tubes not appreciated at the time • Decision made to rebuild the jaws, using same design and to reassemble the collimator using the same jaw support system, rotation mechanism, stepper system, RF shield and vacuum tank • If a location where a collimator of this design is desired at CERN is proposed, we would evaluate and improve each of these features • New ideas on jaw support, moly shaft, rotation, RF shield, tank, BPM, etc • Main purpose of the rebuilt RC is to verify that it can survive the damage in a HiRadMat beam test and so validate the high power, low distortion aspects • RC as designed is too complex and slow to manufacture at SLAC • Many surfaces require 50-75 um machining tolerances as preparation for brazes • Current estimate for shipment to CERN is Spring 2013 Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  7. Task 2.5 Study Topics (beam-beam) • Investigate the options for HL-LHC • Choice of basic options – b*, crossing scheme • Luminosity leveling techniques - talk by T.Pieloni • Imperfections, mitigation of beam-beam • Develop self-consistent simulations of the beam-beam phenomena with other dynamical effects • Interplay with machine impedance - talk by S.White • Crab cavity, noise, offset, etc. • Help understand the experimental data from LHC as it becomes available • Also use RHIC for beam-beam experiments • Support new ideas Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  8. Circular Modes and Flat Beams for LHC • A special type of coupled beam optics can convert planar betatron modes into circular modes • For circular modes, the Space Charge tune shift is determined by the maximal emittance, being independent of the minimal one • After acceleration, the beam can be transferred into the planar state, becoming flat – gain in luminosity • With flat beams, leveling can be done with b* in the crossing plane – no need for crab cavity * A. Burov, “Circular modes for flat beams in LHC”, HB2012 A.Burov Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  9. Luminosity Scenario with Flat Beams LHC A.Burov, A.Valishev Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  10. Hollow Electron Beam Tests in the SPS/LHC? Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  11. RadiationDamageStudies: Context • Beam-induced damages represent one of the most dangerous and though less explored events for LHC and state-of-the-art machines. • Novel, yet-to-characterize, composite materials are under development to meet these challenges. • New sophisticated and powerful numerical tools (Hydrocodes) are used to simulate accidental events. Limitations exist as to material constitutive models. • Need to study material under direct high intensity beam pulses  HRMT-14 experiment at CERN HiRadMat • Need to understand material degradation after prolonged exposure to high particle fluences. Irradiation studied at BNL Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  12. LHC Collimation Upgrade Material Study (BNL) • Four (4) materials will make up the irradiation array: • Molybdenum-Graphite compound • Molybdenum • Glidcop • Copper-diamond • Of interest are irradiation-induced damage and degradation of key physical and mechanical properties • Thermal conductivity • Thermal expansion and dimensional changes • Stress-strain behavior and ductility loss • Annealing temperatures for damage reversal • Obtaining of property changes as a function of dose and/or temperature • Sought are effects from doses equivalent to what will be experienced at the upgraded LHC • Objective is to utilize the deduced information in the upgraded collimator design. • LARP is planning to support this work. Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  13. Comments about Long Term Visitor Program • The LTV program has been one of the biggest successes for LARP. • Already showed good work of current LTVs Bhat and Burov • Historically, LARP has paid transportation and living expenses for LTVs, while their home labs continued to pay their salaries. • The new push from the DOE to identify all expenses with specific projects will make this much more difficult. • Supporting LTVs becomes prohibitively expensive if LARP has to pay salary (US accounting) in addition to living expenses • $50-60k/yr $350k/yr • Note: even I am not 100% paid by LARP! • In the future, we will have to be more creative in supporting LTVs • LARP can only pay salaries for “mainstream” LARP activities! • Does the person have to be 100% LARP? • External support (e.g. CERN Project Associateships) always helpful. • In the end, every case has to be handled on an individual basis. Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  14. QXF overview • 150 mm aperture • 140 T/m nominal gradient • Support structure based on aluminum shell pre-loaded with bladders • Status of the development • Conductor and cable R&D • Magnetic and mechanical design and analysis Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  15. Cable R&D • Winding test in progress at FNAL, LBNL and CERN • Goal • determine mechanical stability of the cable during winding • Provide feed-backs for cable optimization Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  16. Coil design Preliminary cross-section • Different cross-sections considered Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  17. Mirror Test of Rad-hard TQ Coil at Fermilab • Demonstration of Rad-hard epoxies in high field accelerator magnets • Matrimid 5292 (2 part Bismaleimide resin) • May provide a factor of ~2 improvement in acceptable dose with respect to CTD 101K • Technical/process challenges: requires high temperature for adequate viscosity, but has short pot life at these temperatures • On 11/15 coil reached conductor limit withfaster training than in previous mirror tests Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  18. Mirror Test of Rad-hard TQ Coil at Fermilab • Demonstration of Rad-hard epoxies in high field accelerator magnets • Matrimid 5292 (2 part Bismaleimide resin) • May provide a factor of ~2 improvement in acceptable dose with respect to CTD 101K • Technical/process challenges: requires high temperature for adequate viscosity, but has short pot life at these temperatures • On 11/15 coil reached conductor limit withfaster training than in previous mirror tests Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  19. Integration of LARP and GAD Programs The TQ Coil Test performed by the core program at Fermilab represents a significant step supporting these R&D topics for LARP/HiLumi LHC Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  20. Reminder: LARP Down Selection • First (very preliminary!) pass at costs • Progress at this meeting • Meeting of LARP, CERN, and DOE representatives outline likely scope of project (but not ready to present publicly at this time) Compare to ~$250M Compare to $12.4M/year Prebys, LARP Summary - Joint HiLumi/LARP Meeting

  21. Next US LARP/HiLumi Meeting • Probably April 8-10, 2013 (90% C.L.) • LBL or Napa • Waiting final confirmation • Thanks to everyone for a productive and enjoyable few days!! Prebys, LARP Summary - Joint HiLumi/LARP Meeting

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