SLAC’S FLAVORFUL PAST PORTENDS AN EQUALLY FLAVORFUL...
Transcript of SLAC’S FLAVORFUL PAST PORTENDS AN EQUALLY FLAVORFUL...
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SLAC’S FLAVORFUL PAST PORTENDS AN EQUALLY
FLAVORFUL FUTURE
Jonathan DorfanSLAC National Accelerator Laboratory
APS Meeting , May 3, 2009 Denver, Colorado
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Guidelines For Talk“A thought I had for one of the invited sessions
was to include two talks that would each retrospectively celebrate the histories of both SLAC and CESR/CLEO, and look forward to how the physics and the accelerator accomplishments will influence the future of heavy flavor and advanced accelerator techniques. ……” Chip Brock
My talk will focus on the flavor journey travelled by SLAC and where that points for the future. The talk will necessarily not speak about the parallel measurements made around the world, not because they weren’t very important, but because the request was to focus on SLAC.
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James BjorkenDIRAC Medal - 2004
Richard TaylorNobel Prize - 1990
Charles PrescottPanofsky Prize
1988
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Martin Perl (Nobel Prize – 1995) andBurton Richter (Nobel Prize – 1976)
at SPEAR 1975
SPEAR
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Discovery of Charm (simultaneous with Ting’s expt. at BNL)
Mark I at SPEAR. Nov 1974
Ψ(3095)
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Ψ(3700)
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Discovery of Open Charm: Mark I data from SPEAR
Gerson Goldhaber
1976
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First Excited State of D0 is Seen at SPEAR
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Mark I at SPEAR: D+-
In rather a short time, the key elements of a bound charm anti-charm heavy quark system are revealed
1976 1979
Mark II at SPEAR: Λc
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CRYSTAL BALL AT SPEAR…..
Photon spectrum Photon spectrum ΥΥ(2S) (2S) γγ + x+ x
….and DESY
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Mark I
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Discovery of the τ in 1975: 24 anomalous eμ events in Mark I
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Early measurements of τ leptonic branching fraction, massMark I 1977
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Mark II: Hadronic Decays of τ
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PEP-II 1983: b quark lives much longer than expected
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Mark II@ PEP
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1983 Mark II at PEP
The τ is by now well established as a universal weak partner to the electron and muon. Self-consistency between the lifetime, mass and leptonic branching fraction. Hadronic modes seen with appropriate BRs and no hint of second class currents. World-wide experimental agreement
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Martin BreidenbachPanofsky Prize1999
Mark II Nν = 2.8 +- 0.6 Nov.1989
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The Era Of Silicon Vertex Detectors Begins at Storage Rings
1989 Mark II at SLC (Followed by SLD pixel Detector)
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Helen QuinnDIRAC Medal - 2000
PEP-II Accelerator
BABAR Detector
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1989
B Factory Era – Capitalizing on Past Events
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KEKB/BELLE & PEP-II/Babar usher in a new era of heavy flavor meas.
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Integrated Luminosity Came Fast and Furiously
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Italy [12/101]INFN, BariINFN, FerraraLab. Nazionali di Frascati dell' INFNINFN, Genova & UnivINFN, Milano & UnivINFN, Napoli & UnivINFN, Padova & UnivINFN, Pisa & Univ & ScuolaNormaleSuperioreINFN, Perugia & UnivINFN, Roma & Univ "La Sapienza"INFN, Torino & UnivINFN, Trieste & Univ
The Netherlands [1/5]NIKHEF, Amsterdam
Norway [1/3]U of Bergen
Russia [1/11]Budker Institute, Novosibirsk
United Kingdom [10/66]U of BirminghamU of BristolBrunel UU of EdinburghU of LiverpoolImperial CollegeQueen Mary , U of LondonU of London, Royal Holloway U of ManchesterRutherford Appleton Laboratory
USA [38/300]California Institute of TechnologyUC, IrvineUC, Los AngelesUC, RiversideUC, San DiegoUC, Santa BarbaraUC, Santa CruzU of CincinnatiU of ColoradoColorado StateFlorida A&MHarvardU of IowaIowa State ULBNLLLNLU of LouisvilleU of MarylandU of Massachusetts, AmherstMITU of MississippiMount Holyoke CollegeSUNY, AlbanyU of Notre DameOhio State UU of OregonU of PennsylvaniaPrairie View A&M UPrinceton USLACU of South CarolinaStanford UU of TennesseeU of Texas at AustinU of Texas at DallasVanderbiltU of WisconsinYale
Canada [4/20]U of British ColumbiaMcGill UU de MontréalU of Victoria
China [1/5]Inst. of High Energy Physics, Beijing
France [5/51]LAPP, AnnecyLAL OrsayLPNHE des Universités Paris VI et VIIEcole Polytechnique, Laboratoire Leprince-RinguetCEA, DAPNIA, CE-Saclay
Germany [4/31]Ruhr U BochumTechnische U DresdenUniv HeidelbergU Rostock
The BABAR Collaboration10 Countries77 Institutions
593 Physicists
03/22/07 Visit of Jürgen Mlynek and Albrecht Wagner
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A Fountain of Flavor PhysicsNo Way for me to Cover It All
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# PhD theses defended/year
Of the 420 identified BaBar PhD theses, 300 have graduated
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Rash of heavy charm states observed.Started with ………..
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An Unexpected, and Unexplained, Spectroscopy
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Where Has This Journey Taken Us to at SLAC?
• The Legacy after B Factory – Transfer of vacuum and RF Technology to SPEAR3– GLAST : BaBar “hardware” in space. – Kavli Institute, LSST– EXO– SuperB in Italy. Main motivation is flavor sector couplings– ATLAS (trigger, vertex detector, computing, physics)
• Legacy of Linac, SLC – ILC – Advanced Accelerator R&D
• FACET : Plasma Wakefield acceleration
– Linac Coherent Light Source (LCLS), flavor of a different kind
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GLAST ConstructionGLAST Construction
The Whole Instrument The Whole Instrument Was Assembled at SLACWas Assembled at SLAC
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03/22/07
Visit of Jürgen Mlynek and Albrecht Wagner
The 2006 Chemistry Nobel Prize The 2006 Chemistry Nobel Prize Prof. Kornberg from Stanford Medical SchoolProf. Kornberg from Stanford Medical School
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Linac Coherent Light Source at Linac Coherent Light Source at SLACSLAC
Injector (35Injector (35ºº))at 2at 2--km pointkm point
Existing 1/3 Linac (1 km)Existing 1/3 Linac (1 km)(with modifications)(with modifications)
Near Experiment HallNear Experiment Hall
Far ExperimentFar ExperimentHallHall
Undulator (130 m)Undulator (130 m)
X-FEL based on last 1-km of existing linacXX--FEL based on last 1FEL based on last 1--km of existing linackm of existing linac
New New ee−− Transfer Line (340 m)Transfer Line (340 m)
1.5-15 Å1.51.5--15 15 ÅÅ
XX--ray ray Transport Transport Line (200 m)Line (200 m)
LLNLLLNL
UCLAUCLA
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84 meters of FEL Undulator Installed
25 25 undulatorsundulatorsinstalledinstalled……8 more to go8 more to go
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BPMBPMquadrupolemagnetquadrupolemagnet
3.4-mundulatormagnet
3.4-mundulatormagnet
Beam Finder WireBeam Finder Wire
CAM-based 5-DOF motion control
CAM-based 5-DOF motion control
beamdirectionbeamdirection
X-translation (in/out)
X-translation (in/out)
Wire Position MonitorWire Position Monitor
Hydraulic Level SystemHydraulic Level System
sand-filled, thermally isolated supports
sand-filled, thermally isolated supports
Undulator Girder with 5-DOF Motion Control + IN/OUT
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Undulator Gain Length Measurement at 1.5 Å: 3.3 mγεγεx,yx,y = 0.4 = 0.4 μμm (slice)m (slice)IIpkpk = 3.0 kA= 3.0 kAσσEE//EE = 0.01% (slice)= 0.01% (slice)