Presentation is loading. Please wait.

Presentation is loading. Please wait.

X. DongAug. 5th, 2010 RNC Group Meeting 1 Barrel Time-Of-Flight In Run10 Xin Dong Many thanks to the TOF group.

Published byJoanna Lucas Modified over 9 years ago

Similar presentations

Presentation on theme: "X. DongAug. 5th, 2010 RNC Group Meeting 1 Barrel Time-Of-Flight In Run10 Xin Dong Many thanks to the TOF group."— Presentation transcript:

1 X. DongAug. 5th, 2010 RNC Group Meeting 1 Barrel Time-Of-Flight In Run10 Xin Dong Many thanks to the TOF group

2 Aug. 5th, 2010 RNC Group MeetingX. Dong 2 TOF Close-out Review Reviewed on Aug 10-11, 2009 at BNL. Report can be found here: http://www.bonner.rice.edu/~eppley/TOF_review_2009/STAR_TOF_closeout_report.pdf Construction stage -> Operation stage

3 Aug. 5th, 2010 RNC Group MeetingX. Dong 3 Run 10 “Summary”  120 full barrel trays installed  119 trays were active in Run 10 (one out due to the HV cable issue) - only 1 dead channel out of ~23000  Start detector (upVPD or VPD) hasn’t changed since last year  VPD coincidence (and vertex selection)  widely used as the MB condition at high energy collisions  A much cleaner trigger in low energy collisions  TOF multiplicity trigger  Central trigger  UPC trigger  VPD/TOF operation in Run10 went very well.  Preliminary calibrations (based on fast offline) are done, and in db.

4 Aug. 5th, 2010 RNC Group MeetingX. Dong 4 η~ 0η~ 0.9 Z One Tray One Module φ local Y local Z “+” ―To TPC center Barrel TOF Geometry

5 Aug. 5th, 2010 RNC Group MeetingX. Dong 5 Tray Alignment Calibration Use the low luminosity data taken on day 074 Do local (x,y,z) alignment in one loop. Tray alignment calibration constants were uploaded soon during 62 GeV run. Reflected in the fast offline data. Open: from fit to all Solid: from fit to modules 1-6 only

6 Aug. 5th, 2010 RNC Group MeetingX. Dong 6 Conventional Timing Calibration 1.Calibration for the start detectors - VPDs 2.Calculate the start time 3.Calibration for the BTOF trays - Need TPC tracking but enhanced by   at high p limit

7 Aug. 5th, 2010 RNC Group MeetingX. Dong 7 200 GeV and 62 GeV (prel.) calibration 62 GeV200 GeV 85ps 90ps Difference comes from the start side Bingchu Huang

8 Aug. 5th, 2010 RNC Group MeetingX. Dong 8 When Going Down Energy Solutions: 1)Non-Vpd-Start (BTOF self) calibration algorithm implemented 2)Introduce a truncation algorithm in calculating the start time from VPD to suppress the outliers from slow particles The conventional VPD-start calibration method has some issues: 1)The small VPD acceptance causes to start losing significant amount of events, even central events. 2) Outliers from slow particles increase dramatically, which will dilute the start time resolution significantly.

9 Aug. 5th, 2010 RNC Group MeetingX. Dong 9 “Good” events are identified via offline analysis by requiring a valid vertex within |Vz|<75 cm and |Vxy|<2 cm ~ a few % minbias triggered events are “good” events VPD trigger rate ~ 2*collision rates within |Vz|<75cm 1/3 of VPD trigger triggered events are “good” events ~2/3 of “good” minibias events are labeled as VPD triggers BBC Minimum bias trigger: efficient but with large background VPD trigger: much cleaner but inefficient (missing central/peripheral) VPD trigger used as our luminosity monitor Triggers at 7.7 and 11.5 GeV AuAu 7.7 GeV

10 Aug. 5th, 2010 RNC Group MeetingX. Dong 10 39 GeV - Truncation Calib. in VPD VPD Timing not symmetric in low energy collisions - single particle hit in each channel - slow particles lead to larger timings T diff = T i - (j!=i) Use truncated mean in calculating the averaged timing. Remove hits with top 20% high timing - coming from slow particles

11 Aug. 5th, 2010 RNC Group MeetingX. Dong 11 39 GeV Calibration Rafael, Bill Resolution = 86ps With improved start side

12 Aug. 5th, 2010 RNC Group MeetingX. Dong 12 Calibration w/o VPD Calibration completely w/o VPD 62 GeV test Very promising timing resolution! Resolution (ns) # of pions T - T exp (ns) TDIG board ID Resolution (ns) # of pions Ming Shao

13 Aug. 5th, 2010 RNC Group MeetingX. Dong 13 Startless Calibration Strategy Step 1: Obtain the calibration constants (at expert level), two ways: - with the standard VPD start calibration conventional, but require more statistics due to VPD inefficiency - with the new BTOF self calibration Step 2: Apply the calibration constants to data - Algorithm with the new BTOF self calibration (maximize efficiency)

14 Aug. 5th, 2010 RNC Group MeetingX. Dong 14 Tof - Tof exp (ns) Day 125 7.7 GeV Applying with BTOF self calib. algorithm 7.7 fast offline data Calibration constants obtained in 39 GeV with VPD-start calibration procedure. - Demonstrates the tray stability across different collision systems.

15 Aug. 5th, 2010 RNC Group MeetingX. Dong 15

16 Aug. 5th, 2010 RNC Group MeetingX. Dong 16 Particle flight time from TOF Track length from TPC Depend on masses of particles  Can be fitted with Gaussians default time resolution is 110 ps (Run9), may change with p for proton PID method (I) Masayuki Wada This is the default method in production!

17 Aug. 5th, 2010 RNC Group MeetingX. Dong 17 Calculate m 2 from  get the probability of being a particle Currently not in MuDst, people can calculate it by themselves if needed.  momentum and position resolution are essentially determined by the TPC Dylan Thein Masayuki Wada 1-Sigma error bar PID method (II) - M 2

18 Aug. 5th, 2010 RNC Group MeetingX. Dong 18 In progress PID combining TOF and dE/dx Masayuki Wada Yuri Fisyak

19 Aug. 5th, 2010 RNC Group MeetingX. Dong 19 pp2pp Run9 Efficiency = (tracks with matchFlag>0) / (tracks that can be projected to TOF modules) Remarks on Efficiency & Acceptance Acceptance: eta -0.9 - 0.9 at Vz=0 phi averaged acceptance ~0.87 due to tray gaps TOF Matching * Acceptance ~ 0.8 * 0.87 ~ 0.7 single track at plateau - Run9 only 86 trays (out of 120), thus total TOF acceptance * efficiency ~ 0.5

20 Aug. 5th, 2010 RNC Group MeetingX. Dong 20 Summary 1) Run10 TOF operation went quite well. 2) Preliminary calibrations have been done - Promising performance in various collision energies  High energy datasets (200, 62.4 GeV) - Wait for the final TPC calibration and complete the TOF calibration for production  Low energy production are using the fast offline calibration - Check the TOF calibration when doing your analysis 3) TOF PidTraits is available in the MuDst for physics analysis  now developing an integrated PID algorithm combining TOF+dE/dx+(…)

21 Aug. 5th, 2010 RNC Group MeetingX. Dong 21 Calibration Status Preliminary 200 GeV and 62 GeV calibration were done, and constants were in db. 39 GeV calibration were finished, constants will be uploaded to db soon. 7.7 GeV calibration is underway (in accumulating enough statistics) - based on fast offline (preliminary TPC calibration) Important infrastructure updates: 1) Low energy runs: to suppress the outliers from slow particles, introducing a truncation algorithm in calculating the start time from VPD. 2) Non-Vpd-Start (BTOF self) calibration algorithm is implemented in the calibration maker to allow the BTOF self calibration. Fast offline QA - Ulisses Gulart, Rafael Derradi http://www.star.bnl.gov/protected/lfspectra/usouza/TofQA/web/tofQA_woCalib_day126.html Vpd-start calibration - Rafael Derradi, Bingchu Huang, Bill Llope Non-vpd-start calibration - Ming Shao, Bill Llope

22 Aug. 5th, 2010 RNC Group MeetingX. Dong 22 Applying with BTOF self calib. algorithm 62 GeV: Constants from the Vpd-Start calibration in data base (alignment not updated when these constants were obtained) 62 GeV

23 Aug. 5th, 2010 RNC Group MeetingX. Dong 23 How to load TOF calibration … gSystem->Load("StBTofUtil"); gSystem->Load("StVpdCalibMaker"); gSystem->Load("StBTofCalibMaker"); StChain *chain = new StChain("StChain"); StMuDstMaker *muDstMaker = new StMuDstMaker(0,0,"",fileList,"MuDst.root",nfiles); St_db_Maker *dbMk = new St_db_Maker("db","MySQL:StarDb","$STAR/StarDb","StarDb"); StVpdCalibMaker *vpdCalib = new StVpdCalibMaker(); vpdCalib->setMuDstIn(); StBTofCalibMaker *btofCalib = new StBTofCalibMaker(); btofCalib->setMuDstIn(); StMyMaker *myMaker = new StMyMaker(); …

24 Aug. 5th, 2010 RNC Group MeetingX. Dong 24 Introduce xLocal Bingchu Huang

Download ppt "X. DongAug. 5th, 2010 RNC Group Meeting 1 Barrel Time-Of-Flight In Run10 Xin Dong Many thanks to the TOF group."

Similar presentations

 Trigger for Run 8 Rates, Yields, Backgrounds… Debasish Das Pibero Djawotho Manuel Calderon de la Barca Analysis Meeting BNL October 16, 2007.

 Trigger for Run 8 Rates, Yields, Backgrounds… Debasish Das Pibero Djawotho Manuel Calderon de la Barca Analysis Meeting BNL October 16, 2007.
1 STAR TOF Calibration. 2 Detectors TPC(TPX) - tracking MRPC TOF (TOFr) – stop time measurement pVPD/upVPD - start time measurement Particle momentum;

1 STAR TOF Calibration. 2 Detectors TPC(TPX) - tracking MRPC TOF (TOFr) – stop time measurement pVPD/upVPD - start time measurement Particle momentum;
Frank Geurts Rice University.  Time-of-Flight in STAR ◦ start & stop detectors in Run 9  Time-of-Flight Calibration ◦ upVPD ◦ Barrel TOF ◦ preliminary.

Frank Geurts Rice University.  Time-of-Flight in STAR ◦ start & stop detectors in Run 9  Time-of-Flight Calibration ◦ upVPD ◦ Barrel TOF ◦ preliminary.
Direct virtual photon production in Au+Au collision at 200 GeV at STAR Bingchu Huang for the STAR collaboration Brookhaven National Laboratory Aug 21 2014.

Direct virtual photon production in Au+Au collision at 200 GeV at STAR Bingchu Huang for the STAR collaboration Brookhaven National Laboratory Aug
Bingchu Huang, USTC/BNL 1 Bingchu Huang (for STAR Collaboration) University of Science and Technology of China (USTC) Brookhaven National Laboratory (BNL)

Bingchu Huang, USTC/BNL 1 Bingchu Huang (for STAR Collaboration) University of Science and Technology of China (USTC) Brookhaven National Laboratory (BNL)
Algorithms and Methods for Particle Identification with ALICE TOF Detector at Very High Particle Multiplicity TOF simulation group B.Zagreev ACAT2002,

Algorithms and Methods for Particle Identification with ALICE TOF Detector at Very High Particle Multiplicity TOF simulation group B.Zagreev ACAT2002,
Topological D-meson Reconstruction with STAR Using the Silicon Vertex Tracker (SVT) Sarah LaPointe Wayne State University SVT review, BNL, July 7 th /8.

Topological D-meson Reconstruction with STAR Using the Silicon Vertex Tracker (SVT) Sarah LaPointe Wayne State University SVT review, BNL, July 7 th /8.
X.Dong, USTC/LBNL Feb. 20th, 04, STAR Collaboration Meeting 1 TOF Software Progress Xin Dong, for TOF Group  TOF detectors in Run IV  Online software.

X.Dong, USTC/LBNL Feb. 20th, 04, STAR Collaboration Meeting 1 TOF Software Progress Xin Dong, for TOF Group  TOF detectors in Run IV  Online software.
ACORDE REPORT Pedro Podesta UAS Mexico. Geometry ( No changes) Alignment (No changes) QA (No changes ) Shuttle (In progress) To do Outline.

ACORDE REPORT Pedro Podesta UAS Mexico. Geometry ( No changes) Alignment (No changes) QA (No changes ) Shuttle (In progress) To do Outline.
PPR meeting - January 23, 2003 Andrea Dainese 1 TPC tracking parameterization: a useful tool for simulation studies with large statistics Motivation Implementation.

PPR meeting - January 23, 2003 Andrea Dainese 1 TPC tracking parameterization: a useful tool for simulation studies with large statistics Motivation Implementation.
Frank Geurts Rice University.  TOF Timing ◦ HPTDC chip ◦ Calibration for HPTDC Non-Linearity  TOF Performance Monitoring ◦ Online Monitoring ◦ Prompt.

Frank Geurts Rice University.  TOF Timing ◦ HPTDC chip ◦ Calibration for HPTDC Non-Linearity  TOF Performance Monitoring ◦ Online Monitoring ◦ Prompt.
Current Status of Hadron Analysis Introduction Hadron PID by PHENIX-TOF  Current status of charged hadron PID  CGL and track projection point on TOF.

Current Status of Hadron Analysis Introduction Hadron PID by PHENIX-TOF  Current status of charged hadron PID  CGL and track projection point on TOF.
Frank Geurts Rice Univ..  Introducing ◦ barrel TOF and upVPD in Run 9  TOF software ◦ past, present, and future  Calibrations ◦ start, stop, and status.

Frank Geurts Rice Univ..  Introducing ◦ barrel TOF and upVPD in Run 9  TOF software ◦ past, present, and future  Calibrations ◦ start, stop, and status.
Feb 10, 2005 S. Kahn -- Pid Detectors in G4MicePage 1 Pid Detector Implementation in G4Mice Steve Kahn Brookhaven National Lab 10 Feb 2005.

Feb 10, 2005 S. Kahn -- Pid Detectors in G4MicePage 1 Pid Detector Implementation in G4Mice Steve Kahn Brookhaven National Lab 10 Feb 2005.
DE/dx measurement with Phobos Si-pad detectors - very first impressions (H.P Oct 17 1998)

DE/dx measurement with Phobos Si-pad detectors - very first impressions (H.P Oct )
TOF Meeting, 9 December 2009, CERN Chiara Zampolli for the ALICE-TOF.

TOF Meeting, 9 December 2009, CERN Chiara Zampolli for the ALICE-TOF.
Feb. 23rd, 05, STAR Collaboration Meeting, BNL X.Dong, USTC/LBNL 1 Time-Of-Flight in Data Stream in Run 4 and Run 5 Outline  TOF in Run 4  New design.

Feb. 23rd, 05, STAR Collaboration Meeting, BNL X.Dong, USTC/LBNL 1 Time-Of-Flight in Data Stream in Run 4 and Run 5 Outline  TOF in Run 4  New design.
Time of Flight Analysis Progress on TOF Software Frank Geurts for the TOF group.

Time of Flight Analysis Progress on TOF Software Frank Geurts for the TOF group.
Real data reconstruction A. De Caro (University and INFN of Salerno) CERN Building 29, December 9th, 2009ALICE TOF General meeting.

Real data reconstruction A. De Caro (University and INFN of Salerno) CERN Building 29, December 9th, 2009ALICE TOF General meeting.
Thomas Jefferson National Accelerator Facility Page 1 EC / PCAL ENERGY CALIBRATION Cole Smith UVA PCAL EC Outline Why 2 calorimeters? Requirements Using.

Thomas Jefferson National Accelerator Facility Page 1 EC / PCAL ENERGY CALIBRATION Cole Smith UVA PCAL EC Outline Why 2 calorimeters? Requirements Using.

Similar presentations

Ads by Google