Jiawen Zhang, IHEP, 2008, April 10, frascati Status of BEPCII/BESIII and Physics preparation Jiawen...

Jiawen Zhang, IHEP, 2008, April 10, frascati

Status of BEPCII/BESIII and Physics preparation

Jiawen Zhang

2008/4/7—10 ， PHIPSI08, Frascati


Outline• BEPCII• BESIII• MDC• EMC• TOF• MUON• Superconductor• Trigger• DAQ• Offline• Summary


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


The BESIII Detector

Be beam pipe

SC magnet Magnet yoke

MDC

CsI calorimeter

TOF


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


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.


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


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


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.


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%


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


Trigger System Hardware Structure


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


Based on ATLAS online software framework ， transplanted to our environment

• Intercross compiling environment ： Sun Solaris

Tonardo

VxWorks

Gcc


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


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


4 π- tracks in BESIII

p=0.5 -1.5GeV|cosθ|<0.9

pion punch-through

Hits in end-cap TOF


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.


Cosmic ray test


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/.

Jiawen Zhang, IHEP, 2008, April 10, frascati Status of BEPCII/BESIII and Physics preparation Jiawen...

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