Post on 21-Dec-2015
DOE Program Review, SLAC, June 2005
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SLAC BaBar ProgramSLAC BaBar Program
Blair Ratcliff
SLAC BaBar Program Manager
June 2005
Blair Rainer Aaron
DOE Program Review, SLAC, June 2005
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INFN, Perugia & UnivINFN, Roma & Univ "La Sapienza"INFN, Torino & UnivINFN, Trieste & Univ
The Netherlands [1/4]NIKHEF, Amsterdam
Norway [1/3]U of Bergen
Russia [1/13]Budker Institute, Novosibirsk
Spain [2/3]IFAE-BarcelonaIFIC-Valencia
United Kingdom [11/75]U of BirminghamU of BristolBrunel UU of EdinburghU of LiverpoolImperial CollegeQueen Mary , U of LondonU of London, Royal Holloway U of ManchesterRutherford Appleton LaboratoryU of Warwick
USA[38/311]
California Institute of Technology
UC, IrvineUC, Los AngelesUC, RiversideUC, San DiegoUC, Santa BarbaraUC, Santa CruzU of CincinnatiU of ColoradoColorado StateHarvard UU 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 Carolina
Stanford UU of TennesseeU of Texas at AustinU of Texas at DallasVanderbiltU of WisconsinYale
Canada [4/24]U of British ColumbiaMcGill UU de MontréalU of Victoria
China [1/5]Inst. of High Energy Physics,
Beijing
France [5/53]LAPP, AnnecyLAL Orsay
The BABAR Collaboration
11 Countries 80 Institutions623 Physicists
49 Active SLAC Physicists
LPNHE des Universités Paris VI et VII
Ecole Polytechnique, Laboratoire Leprince-Ringuet
CEA, DAPNIA, CE-Saclay
Germany [5/24]Ruhr U BochumU DortmundTechnische U DresdenU HeidelbergU Rostock
Italy[12/99]
INFN, BariINFN, FerraraLab. Nazionali di Frascati dell'
INFNINFN, Genova & UnivINFN, Milano & UnivINFN, Napoli & UnivINFN, Padova & UnivINFN, Pisa & Univ &
ScuolaNormaleSuperiore
DOE Program Review, SLAC, June 2005
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Core Elements of BaBar ProgramCore Elements of BaBar Program
• Computing: Provide infrastructure, support, and management (Rainer)
• Detector: Provide infrastructure, support, engineering and technical support, and management (David)
• Physicist Collaborators (SLAC BaBar)– Computing (Rainer)– Structure and Leadership (Blair)– Detector Upgrades (Blair)– Physics Analysis (Aaron)
DOE Program Review, SLAC, June 2005
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BaBar Manpower Distribution (%)BaBar Manpower Distribution (%)
Total BaBar Manpower Distribution (%)
Computing37%
Eng/Tech & Admin25%
Physics38%
DOE Program Review, SLAC, June 2005
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SLAC Physics Program SupportSLAC Physics Program Support• Detector Operations & “Service”
– (~0.6 of Active Physicist FTEs, ~2x nominal collaboration average) – Significant role in most detector systems, MDI, computing, etc.
• Detector and Computing Upgrades• Physics Analysis• Leadership
– Collaboration Management• Technical Coordinator• Computing Coordinator• Deputy Computing Coordinator
– Operations and Technical• Operations Manager• System Leadership & Technical Board
– DCH– DIRC– Trigger
– Physics and Tools Convenors (7/41 (March Snapshot))• Pentaquark Task Force• Hadronic Spectra• Radiative Penguin• 3 body Charmless• Two Body Charmless• PID
– Standing and Ad-hoc Committees • Exec board; Speakers Bureau; Pub Board; CM2 Oversight; Roadmap Committee; Membership Committee; etc..
• Detector R&D
DOE Program Review, SLAC, June 2005
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Physics Program Support-EducationPhysics Program Support-Education
• 10 Stanford Ph.D. Graduate Students.
• Research Associates– Typically 10-14 – How many do we
turnover? 11 in last two years
– Where are they now?
Next Position for RAs Departing 2003-2005
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Particle Physics Astro-ParticlePhysics
Other PhysicsRes.
Industry
Num
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DOE Program Review, SLAC, June 2005
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Future Challenges-as Lumi GrowsFuture Challenges-as Lumi Grows
• Collaboration Manpower Base is ~static now, but….– Ever larger data sets for Physics Analyses– Necessary Computing Capacity Growth– Luminosity/Background growth.– Pressure on total manpower as LHC draws closer, and
experimental data taking ends. At least flat (increasing?) need for SLAC operational support.
• Detector Upgrades to cope with increasing backgrounds at high lumi– Trigger– DCH Electronics– IFR Barrel
DOE Program Review, SLAC, June 2005
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L1 Trigger Upgrade (DCZ)L1 Trigger Upgrade (DCZ)
Institutions: Bristol, Harvard, Iowa, Manchester, Oregon, RAL, SLAC
8 new ZPDs (Z-Pt-Discriminators) for 3D tracking 24 new TSFs (Track Segment Finders) Interface cards (at back of rack): 24 TSFi, 8 ZPDi and 1 GLTi
TSF
ZPD
BLT
Entire Drift-Chamber Trigger system replaced (except 1 BLT) to gain 3D tracking capability using stereo wires.
Full system physics run test July/04.Driving BaBar L1 since start of Run 5
DOE Program Review, SLAC, June 2005
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• Running since July 29, 2004.
• DCZ does its job just as well as we hoped
– Finding tracks and measuring z0 and pT
• How is this information used?
– ZPD can count tracks with cuts on |z0| and |1/pT|
– GLT can combine “Z tracks” with other trigger objects
• It’s a balancing act– Physics efficiency (which physics?) and robustness– Maximum reduction of L1 trigger rate
Bottom Line on L1 Trigger Rate
DOE Program Review, SLAC, June 2005
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L1 Trigger Upgrade (DCZ)L1 Trigger Upgrade (DCZ)
A conservative start with loose cuts to ensure physics efficiency well preserved.
Reduced L1 rate by 18%(excluding the test 1Z addition)
Configuration study in progress for significantly larger background reductions (e.g. require 1 -ve track OR 1 high Pt +ve track with |Z0|<cut, which were not available with the old DCT system)
Will be essential when luminosity significantly exceeds 1034
DOE Program Review, SLAC, June 2005
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DCH Electronics UpgradeDCH Electronics UpgradeWhat was the problem ?What was the problem ?
• DCH waveform data shipping from front-end causes dead time
(very non-linear!)• In 2003 the problem was anticipated
to become serious soon due to increasing luminosity and trigger rates
• SLAC involvement: Problem identification, solution recommendation, board redesign, QC.
• SLAC manpower: 5 physicists, 2 engineers, students
• Collaborating Inst: SLAC ISU, Notre Dame
DOE Program Review, SLAC, June 2005
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Paths to solve itPaths to solve itPhase I• reduce sampling of raw waveform (32 16 bytes)• Firmware change (PROM) on front-end board• Fully implemented in Summer 2004 shutdown (2 weeks)• Data quality is not compromised
Phase II• Run feature extraction in front-end, data reduction of factor 4• Board redesign including modified FPGA• TDR in Dec ‘04; final design ready; full implementation during
Oct ’05 shutdown• Test boards have been put on chamber since Jan ‘05 to
evaluate performance. • SEU from neutrons might become a problem (20 functional
upsets per day in 2007) and maybe need attention starting Nov ‘05 (Phase III)
DOE Program Review, SLAC, June 2005
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IFR Upgrade (Barrel RPCs to LSTs)IFR Upgrade (Barrel RPCs to LSTs)
• Jan. ’03: Deteriorating performance of Barrel IFR RPC’s leads to decision to replace with LST’s
• Oct. ‘04: First 2 sextants installed.• 8/06-11/06: Final 4 sextants installed. Delayed
from summer 05 by change in PEP schedule.
DOE Program Review, SLAC, June 2005
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Barrel6 Brass layers RPC LST2 sectors in 20044 more in 2006
Barrel IFR UpgradeBarrel IFR Upgrade
New layer
New RPC belt
10cm steel
5 layers of 2.5 cm brass
DOE Program Review, SLAC, June 2005
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Broad Participation across collaborationBroad Participation across collaboration
IFR Barrel Upgrade ResponsibilitiesIFR Barrel Upgrade Responsibilities
INFN: Ferrara, Frascati, Genova, Padova, Roma, Torino
US: LLNL, Ohio State, Oregon, Princeton, SLAC, UCSD
LST Tube Production and Factory QA; Front End Electronics; Installation
Readout Planes; Module Assembly; Module QC; HV System; Cabling; Gas System; Installation
DOE Program Review, SLAC, June 2005
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Readout Plane ProductionReadout Plane Production
• Manufactured at SLAC using “Large scale lamination.”
• Only Z-planes provide a position. Phi planes serve as the ground plane and transmit wire signals to forward end.
• Manufactured at SLAC using “Large scale lamination”
• Production of all planes completed by Fall 2004.
DOE Program Review, SLAC, June 2005
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CEH QC AreaCEH QC Area
• QC being done at CEH• First 2 sextants had 0
bad wires out of ~2000• QC continuing on
modules for ‘06. Last shipment expected this week
• Simultaneously testing HV cables and supplies
DOE Program Review, SLAC, June 2005
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LST InstallationLST Installation
• New east platform for electronics
• Special tooling for backward corner block
Peter Kim & Charlie Young
DOE Program Review, SLAC, June 2005
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Backward side
Bottom sextant before and after installationBottom sextant before and after installation
DOE Program Review, SLAC, June 2005
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Typical PlateausTypical Plateaus
• All good• Operated at 5500V
DOE Program Review, SLAC, June 2005
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EfficiencyEfficiency
DOE Program Review, SLAC, June 2005
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Muon Pair in LST Equipped SectorsMuon Pair in LST Equipped Sectors
DOE Program Review, SLAC, June 2005
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Physics AnalysisPhysics Analysis
• Fully collaborative physics analysis model….. across institutions and groups.
• Broad program. Many different “key” results.• Some examples of SLAC BaBar’s interests:
– CP Violation in B 00 &, more generally, B mm’ where m and m’ are charmless mesons.
– Inclusive semi-leptonic B decays and the extraction of |Vub| & |Vcb|– CP Violation and search for new physics in B Ks ; B K+ K-Ks ; B KLKsKs
– Search for Exotic Baryons (Pentaquarks)– Search for narrow mesonic resonances (Ds, X(3872), etc.)– Inclusive Hadronic Spectra; K,p,,c,……………..– Radiative Penguin decays; Inclusive b sInclusive bdK*; B;
B; etc.– ISR; Exclusive hadronic final states; Inclusive and exclusive measurements of R.– Leptonic b & c decays; (e.g., B e D Ds – Exclusive B decays; B p+p-’K*
• See Aaron’s talk!
DOE Program Review, SLAC, June 2005
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SummarySummary
• SLAC BaBar:– Provides infrastructure, management, and
technical support for detector and computing.– Physics groups partner with the Collaboration
on analysis, & operations.– Aaron Physics– Rainer Computing