Frederick A. Harris University of Hawaii For the BES Collaboration
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Transcript of Frederick A. Harris University of Hawaii For the BES Collaboration
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Frederick A. HarrisFrederick A. Harris
University of HawaiiUniversity of Hawaii
For the BES For the BES CollaborationCollaboration
BEPCII/BESIII e+ e- Collisions from phi to psi
Budker Institute of Nuclear PhysicsNovosibirsk, Russia
Feb. 27- Mar. 2, 2006
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The Beijing Electron Positron Collider (BEPC)
L ~ 51030 /cm2s at J/ peak Ecm~ 2 - 5 GeV
A unique e+e- machine in the -charm energy region until CLEOc.
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BEPCII: a high luminosity double–ring collider
SC RF
Beams
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BEPCII Design goal
Energy range 1 – 2.1 GeV
Optimum energy 1.89 GeV
Luminosity 1 x 10 33 cm-2s-1 @ 1.89 GeV
Injection Full energy injection: 1.55 1.89 GeV Positron injection speed > 50 mA/min
Synchrotron mode 250 mA @ 2.5 GeV
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Design Goals and Main Parameters
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1029
1030
1031
1032
1033
1034
1035
1036
1037
1 10 100 1000
GLC
ADONE
VEPP2000
KEK B and PEP II
KEK BPEP II
CESR
DAFNE
DAFNE2
BEPCII
CESRc
Ecm
(GeV)
L (cm-2sec-1)
VEPP2M
LEP
TRISTANPETRA
VEPP4MDORIS
SPEARBEPC
COLLIDERS
FACTORIES
SUPER FACTORIES
e+-e- Colliders: Past, Present and Future
L (cm-2 s-1)
E (GeV)
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Bending magnets Quadrupole magnets
Sextupole magnets Dipole correctors
Magnet System
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BEPCII Status• BEPCII linac installation complete; most design specifications reached.
• Storage ring: Major magnets, superconducting RF cavities and quadrupole magnets, as well as the cryogenics system have been completed, and their installation is under way.
• Beam collisions expected in spring 2007.
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BESIII Detector
Be beam pipe
SC magnet Muon Counter
Drift Chamber
CsI(Tl) calorimeter
TOF
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MDCParametersR inner: 63mm ; R outer: 810mm Length (out.): 2582 mm Inner cylinder: 1.2 mm Carbon fiberOuter cylinder: 11.5 mm CF with 8 windowsSense wire : 25 micron gold-plated tungsten (plus
3%Rhenium ) --- 6796 Layers (Sense wire ): 43
Expected performance
Field wire: 110 micron gold-plated Aluminum --- 21884Gas: He + C3H8 (60/40)Cell: inner chamber --- 6 mm
outer chamber --- 8.1 mm
%6~
@1GeV/C%5.0~
130~
dxdE
P
m
dx
dE
P
x
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MDC
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Wire Stringing Complete
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Beam test at KEKPrototype tested in a 1T magnetic
field at KEK 12GeV PS last year. Results:• spatial resolution better than 130
µm• cell efficiency over 98%• dE/dX resolution better than 5% (3σ π/K separation exceeding
700MeV/c).
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CsI(Tl) crystal calorimeter
• Design goals:– Energy: 2.5% @ 1GeV– Spatial: 0.6cm @ 1GeV
• Crystals:– Barrel: 5280 w:
21564 kg– Endcaps: 96 w: 4051 kg– Total: 6340 w: 25.6 T
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Many useful suggestions from Alexander Bondar.
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Testing:•Size•Source tests (137 Cs)•LED tests•PD tests•Preamp tests•Cosmic ray tests•Beam tests (6 x 6 array):
X position
ADC
CsI Calorimeter
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Mechanical structure
A 1/60 prototype
Status:• Assembly starts soon. Should
be completed by end of year.• By the end of the year, all
electronics boards should be tested and installed.
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TOFCrucial for particle ID• Barrel
– 50mm x 60mm x 2320 mm (inner layer).
– BC408 – 2 layers
• Endcap– 48 fan shaped pieces –
each end.– BC404
• PMT: Hamamatsu R5942
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TOF Performance
Time resolution 1-layer (intrinsic):
Belle: 70 to 80 ps Beam tests: < 90 ps Simulation: < 90 ps
Time resolution of two layers is 100ps to 110ps
for kaon and pions.
K/ separation: 2 separation up to 0.9 GeV/c.
Capability of K/ separation
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Beam tests of TOF module TOF module includes: scintillator, PMTs, preamps, 18m
cable, VME readout board of FEE.
Pion: 104±11ps proton: 70±2ps Electron: 94±3ps
Time resolution from beam test of prototype ( including scintillator, PMT, preamp, electronics, cable).Time difference of two TOF layers: no errors from reference time (To) or position.
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TOF Monitor System Monitor the amplitude and time performance of
each channel including PMTs and electronics. Being designed by University of Hawaii. Just approved by DOE: 3/1/2006
TOF endcap 48 fibersTOF endcap 48 fibers
Laser Light splitter
TOF barrelPMT PMT
PMTTDC startADC gate
Fiber
TOF barrel 176 fibersTOF barrel 176 fibers
Electronic switch
fiber
Fiber bundles
fiber
connector Wrapped with steel tube
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Coil: single layer solenoid Cooling mode: two phase helium
force flowSuperconductor: Al stabilized
NbTi/CuWinding: inner windingCold mass support: tension rodThermal shield: LN2 shield, MLI
Flux return: barrel/end yoke, pole tip
Superconducting Magnet
Cryostat
Inner radius 1.375m
Outer radius 1.7m
Length 3.91m
Coil
Mean radius 1.482m
Length 3.52m
Cable dimension 3.7mm*20mm
Electrical parameters
Central field 1.0T
Nominal current
3650A
Inductance 2H
Stored energy 10MJ
Cold mass 3.6ton
Total Weight 15ton
Radiation thickness
2X0
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BESIII Magnet ProgressThermal
insulation assemb
ly
transportation
wiring
installation
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Field mappingComputer controlled 3D mapping machine is under development.
Field measuring accuracy < 0.25%.
Measure ~90000 points with 0.5 mm position accuracy.
Mapping device
Status:• Complete cooling test of
the magnet before summer.
• Complete the field mapping together with SCQ before Dec. 31, 2006.
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Muon Chamber
Barrel + EndCap;
RPC as μ detector; Barrel : 9 layers EndCap: 8 layers
One dimension read-out strips;
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RPCs• Electrodes made from a special type of phenolic paper
laminate on bakelite.• Have good surface quality ( ~200nm).• Extensive testing and long term reliability testing done.• Have high efficiency, low counting rate and dark
current, and good long-term stability .
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(RPC module)• Total of 64 endcap modules, 72 barrel modules;• Gas: Ar:C2H2F4:Iso_Butane = 50:42:8• HV voltage: 8000V;• One module contains two RPC layers and one readout layer.
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28All RPC production, assembly, testing, and installation completed.
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Test Result after installation - endcapAverage strip efficiency: 0.97 Spatial resolution: 16.6mm
Mean of 64 endcap RPC = 0.95
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μ/π Identification Efficiency
0
10
20
30
40
50
60
70
80
90
100
0. 5 0. 75 1
Using Muc Info only
%
GeV/c
90.3
6.24
5.5 9.0
12.6 18.9
12.0
91.2 87.6
π fake rate
μ efficiency
Ratio of π decay to μbefore entering Muc
Design Goal
15.0 9.0 6.0
From Simulation
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Trigger and DAQ• The trigger design is almost finalized; uses FPGA. • By the end of the year, all the boards should be tested and
installed.• The whole DAQ system tested to 8K Hz for the event size of 12Kb, a factor of two safety margin. • The whole DAQ system tested during beam test with MDC and EMC
L1 trigger rate: 4 KHz Event Size: 12 KBytes
Bandwidth after L1: 48 MByte/sec
Dead time: < 5%
1000 * BESII DAQ system
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Offline software
HepEvt McTruthG4Event
HitsDigitsRawDataCnvSvcBES I I I RawData
Generator EventConverters Simulation
Digitization
ReconstructionAlgorithms
CalibrationAlgorithms RecHits RecTracks
AnalysisTools DstTracksHistograms
Ntuples
RootDstCnvSvcDstData
Rec2DstAlgReconstruction
Calibration &Database
Framework CoreSoftware
Simulaton
Physics AnalysisSoftware
BES III Software
BOSS – BES Offline Software Systembased on Gaudi.
Tremendous amount accomplished so far.Much more to do.
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Event Display Tool: BesVis
Based on ROOT, OpenGL, X3D and XML
Support both 2D and 3D view
Operations and controls available through menu and toolbar items
First version was released in December 2005.
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SIMULATION – Based on Geant4
MDC tracking performance:Sub-detector Design MC MDC σw (μm) 130 110
σp/p 0.5% 0.4%
σdE/dx 6-7% 6%
TOF σt (ps) 90 85
EMC σE/E 2.5% 2.2%
σxy(mm) 6 4.8
MUC ε(μID) 95% 96%
ε(π->μ) 6% 6.2%
μ- at pt = 1GeV/cMomentum resolutionσ = 0.4 MeV
EMC (barrel) Energy Resolution -single
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Muon Counter
Ext track
Fired strips
Window
TOF
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~1.2MeV
pπ
~3MeV
ππKS
Physics Simulations
50, 000 ˝ Inclusiveevent sample.
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πKD0 πππKD0
π
00 ππKD ππKD S
0
50, 000 ˝ Inclusive event sample.
σ(mBC) ~ 1.2 MeV/c2
σ(ΔE) = 7 MeV
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BESIII: (8M , M.C.)m(c1) = 3.508GeV,m(c2) = 3.553GeV;(c1) = 8.1MeV,(c2) = 9.4MeV.
Ψ' cJ , cJ J/
c1c2
0
Ψ' J/(0, ), (0, )
c0
m() = 549 MeVm(0) =135 MeV
m(c-) =3.413GeV,(c0) =9.0MeV.
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Inv.mass of chrg.trks. (GeV)
Even
ts
c1
c2
c0c1
c2
c0
c1
c2
c0
Ψ' cJ , cJ Ψ' cJ , cJ KK
c
BESIII: (0.5 M , M.C.)Ψ' cJ , cJ multi-tracks
Ψ' cJ , cJ (6)
Ψ' tail
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Physics Topics at BESIII
• Charmonium: J/, (2S), C(1S) in J/ decay, C{0,1,2} , C(2S) and hC(1P1) in (2S) decay , (1D) and so on • Exotics : hybrids, glueballs and other exotics in J/ and (2S) radiative decays;• Baryons and excited baryons in J/ and (2S) hadronic decays;• Mesons and mixing of quark and gluon in J/ and (2S) decays;• Open charm factory : Absolute BR measurements of D and Ds decays, Rare D decay, D0-D0bar mixing, CP violation, f D+, fDs , form factors in semi-leptonic D decays, precise measurement of CKM (Vcd, Vcs) CP violation and strong phase in D Dalitz Decays, light spectroscopy in D0 and D+ Dalitz Decays.• Electromagnetic form factors and QCD cross section; • New Charmonium states above open charm threshold---R values ...; • tau physics near the threshold.
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Resonance Mass(GeV)CMS
Peak Lum.(1033cm-2s-1)
Physics Cross Section (nb)
Nevents/yr
J/ 3.097 0.6 3400 10 109
3.670 1.0 2.4 12 106
(2S) 3.686 1.0 640 3.2 109
D0D0bar 3.770 1.0 3.6 18 106
D+D- 3.770 1.0 2.8 14 106
DsDs 4.030 0.6 0.32 1.0 106
DsDs 4.140 0.6 0.67 2.0 106
Average Lum: L = 0.5×Peak Lum.; One year data taking time: T = 107s
Nevent/year = exp L T
Production
Huge J/ and (2S) samples at BESIII
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1.0 T 1.0 T
magnet
----9 layers counter
RichT(ps) = 100-110/layer Double layer
TOF
2.0%0.3 cm /E
E/E(0/0) = 2.5 %(1 GeV)
z(cm) = 0.5cm/E
EMC
6%dE/dx (0/0) = 6 - 7 %
0.5 %P/P (0/0) = 0.5 %(1 GeV)
MDC
90 mXY (m) = 130
CLEOcBES III Detector
BESIII and CLEOc comparison
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FutureIn US:• CLEOc stops in 2008• BaBar stops running in 2008.• Fermilab stops collider physics in 2009.
In China:
BESIII commissioning in summer 2007.
BESIII will be a unique facility.
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BESIII CollaborationFirst formal meeting held Jan. 10-12, 2006 at IHEP, Beijing.Adopted Governance Rules, elected IB Chair and Spokespersons.
Institute of High Energy PhysicsUniversity of Science and Technology Peking University Tsinghua University Shangdong University Nankai University Central China Normal University University of Anhui University of Zhejiang University of Zhengzhou Nanjing Normal University Nanjing University Shanxi University Sichuan University Henan Normal University
University of Hawaii University of
Washington University of Tokyo Joint Institute of Nuclear Research, Dubna GSI University of Bochum University of Giessen
Need more here!
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Physics preparation
• Write a yellow book on BESIII physics: a summary of theoretical and experimental tau-charm physics and the BESIII physics reach.
http://bes.ihep.ac.cn/bes3/phy_book/book/book.html
• Workshops :
– Charm 2006: International tau-Charm workshop Beijing June 5-7 2006
– US-China workshop on HEP cooperation
• Charm2006: Workshop on Tau-Charm Physics
• June 5 – 7, 2006, Beijing, China
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Summary
• BEPCII linac installation complete.• Elements for collider complete;
installation beginning.• BESIII hardware and software progressing
rapidly, although still much to do.• Commissioning expected in summer
2007.• Rich physics after CLEO-c.• Collaborators welcomed!
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БОЛЬШОЕ СПАСЙБОT = 20 C (-)
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БОЛЬШОЕ СПАСЙБО
T = 20 C