1. 24/03/2011P.-A. Loizeau – Univ. Heidelberg The CBM Time of Flight wall electronic readout chain Pierre-Alain Loizeau PI – Uni Heidelberg DPG 2011, Münster HK55.3

2. The CBM Time of Flight wall electronic readout chain 2/10 P.-A. Loizeau – Univ. Heidelberg – HK55.3, DPG 2011, Münster24/03/2011 2. The electronic chain demonstrator 1. CBM and ToF Wall electronics specifications Conclusion & Outlook 3. Proton Test beam at COSY, Jülich 4. Analysis procedure 5. Performance: First preliminary results

3. The CBM Time of Flight wall electronic readout chain 3/10 P.-A. Loizeau – Univ. Heidelberg – HK55.3, DPG 2011, Münster24/03/2011 Number of channels: ~75k Full system time resolution: better than 80ps => 40ps for electronics Hit rate : up to 200 kHz per electronic channel Free running readout 1. CBM and ToF Wall electronics specifications

4. The CBM Time of Flight wall electronic readout chain 4/10 P.-A. Loizeau – Univ. Heidelberg – HK55.3, DPG 2011, Münster24/03/2011 Clock System: CLOSY2 board and distribution tree (GSI) Pre- amplifier and discriminator: PADI III (GSI), ASIC with 4 channels Free-running digitizer: GET4 (GSI), ASIC with 4 channel ReadOut Controller: ROC firmware loaded on the SYSCORE FPGA board, (KIP/ZITI) DAQ: DABC software (GSI) for free-running systems acquisition Monitoring: GO4 framework, (GSI, from the CERN ROOT), used for both online and offline analysis 2. The electronic chain demonstrator Lab pulser resultsσ[ps] chip level36.94 PCB level38.94 PCB-PCB level40.22 ROC and network protocol presented in HK 20.6 and.7 by S. Manz and F. Lemke

5. The CBM Time of Flight wall electronic readout chain 5/10 P.-A. Loizeau – Univ. Heidelberg – HK55.3, DPG 2011, Münster24/03/2011 40 equipped channels: 32 for RPC (16 strips) & 8 for PMTs (4 time reference scintillators) 3. Proton Test beam at COSY, Jülich: Setup Front-end electronics Readout controller Clock generation and distribution BEAMBEAM Reference 4 Reference 1 Reference 2 Reference 3 RPC

6. The CBM Time of Flight wall electronic readout chain 6/10 P.-A. Loizeau – Univ. Heidelberg – HK55.3, DPG 2011, Münster24/03/2011 Channel hit rates between 40Hz and 4kHz, mean rate around 700Hz (correspond to 4Hz/cm², 300 Hz/cm² & and 50 Hz/cm²) 3. Test Beam at COSY Triggered system used as reference for the performance: Data in triggered system taken with the same detector settings Performance: presented in previous talk (HK 55.2) by I. Deppner

7. The CBM Time of Flight wall electronic readout chain 7/10 P.-A. Loizeau – Univ. Heidelberg – HK55.3, DPG 2011, Münster24/03/2011 Unpacking using GO4: Checking data synchronization Ordering data messages (edges) Building hits Ordering hits Analysis using ROOT scripts: Building events from channel coincidences and external reference signal ToT & event structure Correction and analysis Calibration scripts tested first on triggered data 4. Analysis procedure Cleaning, Time Order, Hits: GO4 Event Building Simplification, ToT Calibration: Walk and differential non linearity root file with raw hits root file with raw events root file with reduced events Calibrated Data

8. The CBM Time of Flight wall electronic readout chain 8/10 P.-A. Loizeau – Univ. Heidelberg – HK55.3, DPG 2011, Münster24/03/2011 Time difference = difference between the mean time in reference PMTs (4 signals) and the mean time in the RPC strip (2 signals) System Resolution for RPC strip 6 after preliminary calibration: 104ps (with best reference channels and on a fraction of data with stable rate) RPC data loss in same data: ~40% 5. Performance: First preliminary results

9. The CBM Time of Flight wall electronic readout chain 9/10 P.-A. Loizeau – Univ. Heidelberg – HK55.3, DPG 2011, Münster24/03/2011 5. Performance: Data loss example Channel 37 was lost after ~45 minutes because of a stuck FIFO on digitizer

10. The CBM Time of Flight wall electronic readout chain 10/10 P.-A. Loizeau – Univ. Heidelberg – HK55.3, DPG 2011, Münster24/03/2011 Conclusion 1)Full readout chain put into operation in Nov 2010 2)First free streaming data recorded for our sub-detector, analysis is ongoing 3)Allowed to find some source of data corruption and corresponding recovery methods 4)Still some source of data loss to identify Outlook 1)New tests with updated monitoring tools 2)Optical readout of the ROC (tested in lab, HK 20.6) 3)Test with different RPC demonstrators 4)New version of chain components under development

11. The CBM Time of Flight wall electronic readout chain 24/03/2011P.-A. Loizeau – Univ. Heidelberg – HK55.3, DPG 2011, Münster Thank you for your attention Many thanks for their help to: Norbert Herrmann, Ingo Deppner, Jochen Frühauf, Sebastian Manz, Mircea Ciobanu, Harald Deppe, Holger Flemming, Mladen Kis, Karlsten Koch, Serguey Linev, Walter F.J. Müller, Dieter Prasuhn (COSY) And to all people involved in the development of the readout chain components CBM-TOF Group Contributing institutions: Tsinghua Beijing, NIPNE Bucharest, GSI Darmstadt, USTC Hefei, PI Heidelberg, KIP Heidelberg, INR Moscow, ITEP Moscow, IHEP Protvino, FZD Rossendorf, KU Seoul, RBI Zagreb.