1 / 21

Status of BEPCII/BESIII and Physics preparation

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. BEPC. BEPCII. unit. Beam Energ y. 1.0-2.5. 1.0-2.8. GeV. Inject Energy. 1.3. 1.89. GeV.

jenna
Download Presentation

Status of BEPCII/BESIII and Physics preparation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Status of BEPCII/BESIII and Physics preparation Jiawen Zhang 2008/4/7—10，PHIPSI08, Frascati Jiawen Zhang, IHEP, 2008, April 10, frascati

  2. Outline • BEPCII • BESIII • MDC • EMC • TOF • MUON • Superconductor • Trigger • DAQ • Offline • Summary Jiawen Zhang, IHEP, 2008, April 10, frascati

  3. BEPC BEPCII unit Beam 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 BEPCII • Double ring • Superconductor high frequency cavity • Superconductor Q magnet • Full energy inject, the inject speed much more higher the BEPCI Jiawen Zhang, IHEP, 2008, April 10, frascati

  4. The BESIII Detector SC magnet Magnet yoke TOF Be beam pipe MDC CsI calorimeter Jiawen Zhang, IHEP, 2008, April 10, frascati

  5. MDC • Expected Performance ： Single wire spatial resolution 130mm, 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

  6. 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

  7. TOF Expected Performance ：80-90ps Beam test study：different type scintillator, packing material ，thickness,…The result shown：can be achieve the design target Barrel Endcap Jiawen Zhang, IHEP, 2008, April 10, frascati

  8. HPTDC Test Result；TimeResolution< 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

  9. 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

  10. 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

  11. Superconductor Magnet System LN2 barrel arrived Uphold barrel arrived Uphold barrel ship out to Tangshan 2006,Aug. finished superconductor installation and magnetic field reached 1T Uphold barrel welding in Beijing Jiawen Zhang, IHEP, 2008, April 10, frascati

  12. Trigger System Hardware Structure Jiawen Zhang, IHEP, 2008, April 10, frascati

  13. DAQSystem • 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 Jiawen Zhang, IHEP, 2008, April 10, frascati

  14. BESIIIDAQ System 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

  15. 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

  16. BESIII Offline System • Base on CMT BESIIIsoftware 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 MYSQLoffline calbrication system and parameter management system Jiawen Zhang, IHEP, 2008, April 10, frascati

  17. calibUtil Services Gaudi services Gaudi Client Calibrator Register, write Search Read Simulation Pre-tracking Calibration Detector-Geo Cal-MDC Cal-TOF Fast-track Event-T0 Reconstruction Gaudi Physics Analysis Exp. data MC data Post-tracking EventDisplay Cal-Data Control-Data MDC-track EMC(B/E) TOF(B/E) MUID Metadata (persistent) MySQL rdbms REC Data Phy-tracking V0FIND EVERTEX DST Made DST Data BES III Offline Software System Calibration & Database FACS Reconstruction Simulation Generator Transient Event Store Simulation Digitization Jiawen Zhang, IHEP, 2008, April 10, frascati

  18. 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

  19. 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

  20. Cosmic ray test Jiawen Zhang, IHEP, 2008, April 10, frascati

  21. 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

More Related