Post on 31-Dec-2015
Jiawen Zhang, IHEP, 2008, April 10, frascati
Status of BEPCII/BESIII and Physics preparation
Jiawen Zhang
2008/4/7—10 , PHIPSI08, Frascati
Jiawen Zhang, IHEP, 2008, April 10, frascati
Outline• BEPCII• BESIII• MDC• EMC• TOF• MUON• Superconductor• Trigger• DAQ• Offline• Summary
Jiawen Zhang, IHEP, 2008, April 10, frascati
BEPCII• Double ring• Superconductor high frequency cavity• Superconductor Q magnet• Full energy inject, the inject speed much more higher the BEPCI
BEPC BEPCII unitBeam Energy 1.0-2.5 1.0-2.8 GeV
Inject Energy 1.3 1.89 GeV
Ring girth 240.4 237.5 m
Periods 800 8 ns
Beam Current ~ 20 910 mA
Lum ~1x1031 (30~100)×1031 cm-2s-1
Bunch 1 93
Jiawen Zhang, IHEP, 2008, April 10, frascati
The BESIII Detector
Be beam pipe
SC magnet Magnet yoke
MDC
CsI calorimeter
TOF
Jiawen Zhang, IHEP, 2008, April 10, frascati
MDC• Expected Performance : Single wire spatial resolution 130m, dE/dx 6 % • Beam test at Japan • After assemble, do more then half year cosmic ray test at Lab.• 2008, Jan. installation had finished
Jiawen Zhang, IHEP, 2008, April 10, frascati
CsI Electromagnetic Calorimeter• Expected Performance :
– Energy Resolution : 2.5%@1GeV– Position Resolution : 0.6cm@1GeV
• After much more test for each crystal, assemble it, and at 2007, Oct., installed it to the BESIII.
Jiawen Zhang, IHEP, 2008, April 10, frascati
TOF
Barrel Endcap
Expected Performance : 80-90ps
Beam test study : different type scintillator, packing material ,thickness,…The result shown : can be achieve the design target
Jiawen Zhang, IHEP, 2008, April 10, frascati
HPTDC Test Result ; Time Resolution< 25ps
The RMS Value for one Pulse: 25.5859ps/2~18.09ps
After test it for each counter, at 2007, Dec., assemble all of them to MD, and at 2008, Jan. had finished installation
Jiawen Zhang, IHEP, 2008, April 10, frascati
Next
• The time resolution need more calibrations, if we want to increase it, we need another option.
• MRPC can reach 40ps at INFN, they plan to contribute for the BESIII TOF upgrade, if this plan come true, the total time resolution can reach 60ps. This very avail for the high momentum particle identifier.
Jiawen Zhang, IHEP, 2008, April 10, frascati
MUON• 9 layers RPC, Efficiency >95%• Befor assemble the RPC in modules, we test all of the RPC bare chamber,
after assembled, we test all of the module again. At 2005, Oct., finished installation, the use cosmic ray test all the Muon detector again, at 2008 Mar., after all of the sub-detector installation, do more then one month cosmic ray test with other sub-detectors, we are doing the data analysis, the result shown, the average efficiency reached to more then 98%
Jiawen Zhang, IHEP, 2008, April 10, frascati
Superconductor Magnet System
Uphold barrel ship out to Tangshan
Uphold barrel arrived
Uphold barrel
welding in Beijing
2006,Aug. finished superconductor installation and magnetic field reached 1T
LN2 barrel arrived
Jiawen Zhang, IHEP, 2008, April 10, frascati
DAQ System
• Adopted PowerPC ( MVME2431 ) emulational electronics unit , the whole DAQ data readout ( from unit to online PCs ) and run control are normal, integral performance accord with BESIII requirements.
Design indexes : ~ 50Mb/s, 4000 Hz
BESIII DAQ System
MDC
Fast Ethernet
VME Crates (16)
Readout PCs (4)
TOF
Fast Ethernet
VME Crates (2)
Readout PC (1)
EMC
Fast Ethernet
VME Crates (16)
Readout PCs (4)
MUC
Fast Ethernet
VME Crates (4)
Readout PC (1)
TRG
Fast Ethernet
VME Crates (10)
Readout PCs(2)
COL-ACT-STA-
1 2 3 4 5 6 7 8 9101112HS1 HS2 OK1 OK2 PS
CONSOLE
A B C D E F G HSELECTED
ON-LINE
File Server Online Farm PCs
1 Gbps Switch
Run ControlHistogram
DisplayEvent Display
Fast EthernetSwitch
FarmSupervisor
...
Design Goals Event triggering rate: 4000Hz , average event data length:
12Kb , data rate: 50Mbps
High reliability, provided with failure auto-resume function
Blocking design , easy to extend and upgrade
Farm Node 1
Readout PC
1
2
3 3 3
4
555
Farm Supervi sor1000M Swi tch
100M Swi tch
Run Control Event Di spl ay
Hi stogram Di spl ay
File Server
Tape
5
3
Network Connecti on
Control Command
Event Data
Farm Node 2 Farm Node N
A B C D E F G HSELECTED
O N-LIN E
A B C D E F G HSELECT ED
O N -L INE
4
TRG
Jiawen Zhang, IHEP, 2008, April 10, frascati
Based on ATLAS online software framework , transplanted to our environment
• Intercross compiling environment : Sun Solaris
Tonardo
VxWorks
Gcc
Jiawen Zhang, IHEP, 2008, April 10, frascati
BESIII Offline System
• Base on CMT BESIII software development and management environment
• Base on GAUDI 3 versions software framework• Base on GEANT4 detector primary simulation program
• All of sub-detectors primary reconstruction programs have finished
• Base on MYSQL offline calbrication system and parameter management system
Jiawen Zhang, IHEP, 2008, April 10, frascati
BES III Offline Software System
Transient Event Store
GeneratorGenerator
SimulationSimulation
DigitizationDigitization
GaudiGaudi
Event Display
SimulationSimulation
ReconstructionReconstruction
Physics AnalysisPhysics Analysis
CalibrationCalibration
Cal-MDC
EVERTEX
EMC(B/E)
V0FIND
Exp. data MC data
Detector-Geo
Cal-DataControl-Data
DST Made
Cal-TOF Fast-track Event-T0
MUIDTOF(B/E)MDC-track
RECDataDST Data
Pre-tracking
Post-tracking
Phy-tracking
calibUtil Services
Register, writeSearchRead
Gaudi ClientCalibrator
Gaudiservices
Metadata (persistent)
MySQL rdbms
FACSFACS Calibration Calibration &&
DatabaseDatabase
SimulationSimulation ReconstructionReconstruction
Jiawen Zhang, IHEP, 2008, April 10, frascati
4 π- tracks in BESIII
p=0.5 -1.5GeV|cosθ|<0.9
pion punch-through
Hits in end-cap TOF
Jiawen Zhang, IHEP, 2008, April 10, frascati
Cosmic ray test
• At 2008 Jan., after all of the sub-detector installed(do not include the end cap TOF and endcap of EMC), we do more then 2 month cosmic test, and take a lot of cosmic ray events, used to check the detectors, and now we are doing data analysis for it. At Mar. 15, we have stopped the cosmic ray test, and we are moving the detectors to the collide point.
Jiawen Zhang, IHEP, 2008, April 10, frascati
Summary• 2005,Oct. finished muon detector installation• 2006,Aug. finished superconductor installation and magnetic field
reached 1T• 2007,Oct. finished the EMC barrel part installation• 2007,Nov. BEPCII success achieved collide• 2008,Jan. finished MDC and TOF barrel part installation• 2008, Jan. BEPCII beam current achieved 500mA*500mA, and
calculate Lum. is about 1*1032nbs-1
• 2008, Feb. finished the EMC endcap and TOF endcap installation• 2008, Mar. BESIII cosmic ray test, and take more cosmic ray
event, and now we are use the cosmic ray data to check the sub-detectors.
• 2008, Mar. 15, stop the cosmic ray test, and we are moving the detector to the collision point.
• 2008, June, we’ll begin test with BEPCII, and then we can begin do the physics experiment, the energy point will be set J/.