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Philip Bambade Laboratoire de l’Accélérateur Linéaire Université Paris 11, Orsay, France

Philip Bambade Laboratoire de l’Accélérateur Linéaire Université Paris 11, Orsay, France. ATF2: the linear collider final focus prototype at KEK - an international telescope for nanometre size beams -. Seminar at Wayne State University, Michigan 11 January 2011.

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Philip Bambade Laboratoire de l’Accélérateur Linéaire Université Paris 11, Orsay, France

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  1. Philip Bambade Laboratoire de l’Accélérateur Linéaire Université Paris 11, Orsay, France ATF2: the linear colliderfinal focus prototype at KEK- an international telescope for nanometre size beams - Seminar at Wayne State University, Michigan 11 January 2011

  2. KEK High Energy Accelerator Research Organization, Tsukuba site, Japan Photon Factory: science with photons STF + ATF : R&D for future high energy eelinear colliders + plans intense laser physics KEKB  superKEKB

  3. Accelerator Test Facility @ KEK ATF2 final focus x = 2.8-10 m y = 20-50 nm Damping Ring x = 1.2-2 nm y~ 4-10 pm S-band Linac

  4. LAPP LLR

  5. Higgs boson production at threshold Proposal to run near threshold (√s=230GeV) for a light Higgs (120GeV) Reason  Higgs mass resolution determined from Higgs-strahlung process e+e-  HZ (Z +-, e+e-) with the recoil mass method: is the best due to - better momentum resolution of m±, e± at low energy - larger cross section at 230GeV than at e.g. 350GeV LAL 07-03 F. Richard et al. 230GeV 350GeV mH

  6. Higgs boson reconstruction at threshold Detailed full MC simulation studies being performed with both Z+-, e+e- channels Improving previous studies with - optimal beam energy choice - realistic beamstrahlung effect (parameterization  full simulation) - more efficient e /  ID - better background rejection - model independent analysis (not using H decay final state & e /  isolation) Preliminary result with  channel : mH = 120.010 ± 0.036 GeV(model independent) Reconstructed spectra for different beam energies – includes realistic scaling of IP to maintain collimation depth gggg √s = 230 GeV L = 500 fb-1 mH = 120 GeV LHC : L=30 fb-1 mH=120 ± 0.2 GeV

  7. R&D deliverables from Test Facilities for ILC BDS and DR successful in Oct. 2009 ! y ~4-10 pm 15

  8. Horizontal & vertical emittances at present & planned electron rings ATF meets ILC normalised emittance challenge

  9. 17

  10. ATF2 R&D for linear colliders efficiency Pelec Ne Ecmx y efficiency Pelec beamstrahlung Ecm y,normalised linac RF + sources Luminosity ~  trade-off beam size control & stability cost & feasibility

  11. ATF2 = scaled ILC & CLIC final focus  new local chromaticity correction P. Raimondi and A. Seryi, Phys. Rev. Lett. 86, 3779 (2001)

  12. ATF2 final focus prototype Goal A : nanometer beam size - obtain y ~ 35 nm at focal point - reproduce reliably y ,maintain in time Goal B : trajectory stabilization - 1-2 nm at focal point - intra-train feedback (ILC-like trains) •  2008 construction & installation • 2009 / 2010 commissioning • • 2011 / 2012 goals 1 & 2 + instr. R&D • after 2013 continue Linear Collider R&D • + new science projects with intense laser 1. Expert training on real system 2. Instrumentation for nano-beams 3. Accelerator RD & operation by multi-partner collaboration ATF2 COST : ~ 3 + 1 M$ shared by Asia, EU, US

  13. ATF2 operation & instrumentation R&D 2nd order telescope fine tuning of local errors Match optics into FF buffer section for input errors DR extraction setup, stability

  14. Daily operation meeting in control room 25

  15. Commissioning periods Dec. 2008  3 weeks 2009  21 weeks (=1+2+4+3+3+1+2+2+3) Jan. – Jun. 2010  14 weeks (=3+2+2+3+2+1+1) 1st cont. week Autumn 2010  7 weeks (=2+2+3) 2nd continuous week Beam time scheduling 50% fraction for ATF2 & 4 days per week operation Individual RD tasks & common goals KEK, KNU, Tokyo, Sendai,SLAC, IHEP, UK, France, Spain, CERN,… ATF2 educational function Several PhD & young post-doc researchers in accelerator science

  16. Commissioning gradual x,y* (demagnification) reduction paced by beam tuning instrumentation (BSM / other) background study

  17. Variable IP at ATF2 nominal value y = 0.0001 m x = 0.004 m ultra-low  upgrade since january 2010 y = 0.001 m x = 0.04 m 10 times nominal values ultra-low  upgrade factors 2-4 y [m] nominal y nominal x  2.5 Now April - December 2009 March 2009

  18. Instrumentation preparation and R&D • Stripline BPMs, C and S band cavity BPMs, BSM “Shintake”, wire-scanners •  in most part commissioned and operating satisfactorily (few improvements underway) • IP-cavity BPMs, tilt monitor, OTR profile, LW, FONT •  actively studied as R&D in preparation for goal 2 (and 1) • Background monitors: PLIC optical fibre + dedicated instrumentation •  simulation effort coupled to measurements needed to assess ultra low * feasibility

  19. Reconstructing variations at injection (during dispersion measurements) fRF [kHz] = off 0 +3 +2 +1 0 -1 -2 -3 -2 -1 0 +1 +2 +3 off Y. Renier et al.

  20. Measure X dispersion by changing DR energy X dispersion from energy fluctuations Y dispersion from energy fluctuations < 1e-4 IP DR  Y. Renier et al.

  21. “Shintake” beam size monitor at IP Sensitivity ranges of crossing angles

  22. Tuning steps for 1st ATF2 continuous tuning run 1. Startup 2. DR tuning 3. EXT & FFS C-band BPM calibration4. FFS S-band BPM calibration5. Initial EXT & FFS setup 6. EXT dispersion measurement and correction (x & y) 7. EXT Twiss + emittance calculation at IEX match point (x & y) 8. EXT coupling correction 9. IPBSM preparation 10. Horizontal IP diagnostics 11. Horizontal IP re-matching (if required) 12. Vertical IP diagnostics 13. Vertical re-matching (if required) 14. FFS Model diagnostics (if required) 15. IP multiknob tuning with IPBSM vertical beam size mode - IP y waist, dispersion, coupling scans - IP x waist, dispersion scans - Higher-order terms with dK / tilts 16. IPBSM study - Study required at changeover points between crossing modes - 2/8 degree mode >~350nm - 100nm ~< 30 degree mode ~< 350nm

  23. Automated IP waist scans & Twiss measurements

  24. Multiknobs for <xx’>, <yy’>, <yx’>, <xE> and <yE> control Example with 3 FFS quads for x&y waists and hor. disp. Setup with laser wire-scanners k    <yx’>   <yx’> ktuning

  25. + systematics…

  26. Conclusions and prospects • ATF = only fully open facility for R&D in accelerator physics and instrumentation • International training of young Post-Docs, PhD and Master students, many through co-supervision • Excellent progress with beam instrumentation, especially BPMs (striplines and cavities), BSM and several other ATF2 R&Ds • 1st and 2nd ATF2 continuous beam tuning run in May & December •  Need to plan and support set of regular “goal 1 dedicated” shift blocks for success in 2011 • 300 nm vertical spot (target ~ 100 nm) • ATF operation guaranteed for dedicated LC R&D guarantied to end 2012 – program should continue for LC and extend to other science goals (e.g. strong field physics with intense laser)beyond

  27. Tentative research schedule for 2010-2015 1. Continued ILC/CLIC R&D 2. Physics with intense laser not funded, to be reviewed  R&D for ILC (and CLIC) T. Tauchi

  28. Additional slides

  29. Main parameters • Ecm adjustable from 200 – 500 GeV • Luminosity  ∫Ldt = 500 fb-1 in 4 years • Ability to scan between 200 and 500 GeV • Energy stability and precision below 0.1% • Electron polarization of at least 80% • The machine must be upgradeable to 1 TeV • Technical design phased to 2010-2012 Also developing CLIC  ILC Present outlook

  30. 1st ATF2 continuous tuning run May 17-21, 2010

  31. Software tasks organized following “HEP experiment” model 2 environments: Original ATF V-System + appl. software Flight Simulator portable control system

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