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ECL Trigger overview

ECL Trigger overview. ByungGu Cheon (SKKU) Outline ECL calorimeter ECL trigger scheme & performance Recent trigger upgrade status ECL trigger system @ 10 35 super-KEKB Summary. Belle ECL (Electromagnetic Calorimeter). 8736 CsI(Tl) crystals

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ECL Trigger overview

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  1. ECL Trigger overview ByungGu Cheon (SKKU) Outline ECL calorimeter ECL trigger scheme & performance Recent trigger upgrade status ECL trigger system @ 1035 super-KEKB Summary Mini-Trigger/DAQ workshop,OCU

  2. Belle ECL (Electromagnetic Calorimeter) • 8736 CsI(Tl) crystals • g & eenergy and position measurement • Trigger info. generation : powerful tool to suppress BG events. Mini-Trigger/DAQ workshop,OCU

  3. ECL Trigger • Trigger concept/requirement • Suppress beam-BG and cosmic events • Separate physics events from Bhabha/gg • Fast trigger decision < 1.85 ms • Good timing resolution • Trigger condition • Trigger Cell (4x4 matrix) : ETC > 100MeV • Energy trigger : Total energy sum > 1GeV • Isolated cluster counting trigger : # of clusters > 3 • Bhabha & cosmic-veto triggers Mini-Trigger/DAQ workshop,OCU

  4. Trigger Cell Map Analog cell • 576 Trigger cells • ICN • 136 Analog cells •  ETOT & Bhabha/gg Physics trigger region (Etot / ICN) Mini-Trigger/DAQ workshop,OCU

  5. Bhabha/gg trigger Using Back-to-Back condition of each bhabha type depending on qLAB angle with high energy threshold. Mini-Trigger/DAQ workshop,OCU

  6. Cosmic veto trigger Using naive event topology of hadronic process events against cosmic ray and beam BG topologies. energy trigger effi. r-f Plane in Barrel Region B A B A IR IR C D C D Mini-Trigger/DAQ workshop,OCU

  7. Trigger Scheme Isolated cluster counting trigger Energy trigger and Bhabha trigger Mini-Trigger/DAQ workshop,OCU

  8. Trigger efficiency Energy trigger ICN trigger Bhaha trigger e ~ 97% e ~ 95% e ~ 99% Mini-Trigger/DAQ workshop,OCU

  9. Trigger rate tendency ETOT>0.5GeV ETOT>1.0GeV ETOT>3.0GeV Trigger rate : 900Hz, 400Hz, 250Hz @ 7x1033 Mini-Trigger/DAQ workshop,OCU

  10. Trigger rate tendency ICN bit0 ICN bit1 trigger rates @ 7x1033 : 10KHz, 1.3KHz, 55Hz, 17Hz ICN bit2 ICN bit3 Mini-Trigger/DAQ workshop,OCU

  11. Trigger rate tendency trigger rate @ 7x1033 : 350Hz, 100Hz, 10KHz, 14KHz Bhabha Pre-Bhabha Cosmic Timing Mini-Trigger/DAQ workshop,OCU

  12. Motivation for new trigger system • Weakness of Bhabha trigger for e+e- gX event selection • Separate Bhabha and gg events in the trigger level • Expect much stable Bhabha/gg tagging than current system • Using f directional Back-to-Back condition • Tag of eegX • Matching with track trigger bits • MC simulation study • Bhabha trigger efficiency : 99% • gX trigger efficiency : 37%  72% Mini-Trigger/DAQ workshop,OCU

  13. Electronics flow chart New trigger system Mini-Trigger/DAQ workshop,OCU

  14. STM CCM & EBM AAA CVC (32) (32) (4) ETM GDL TPSD BTL Newly added chain Hardware in new system Mini-Trigger/DAQ workshop,OCU

  15. 1 5 Bhabha/gg tagging r-zplane r-f plane Back to back forf Back to back forq 8 overlapped sectors Bhabha = q & f !! • Forf, • 8 overlapped signals @ r-f plane. • 4 back to back combined signals. • 4 back to back combined signals with different threshold • Forq, • 16 overlapped signals @ r-z plane. Mini-Trigger/DAQ workshop,OCU

  16. 1 5 Bhabha, ggand gX Back-to-Back r-fplane ECL 1 5 2 6 3 7 4 8 CDC 1 5 2 6 3 7 4 8 8 overlapped sectors Bhabha trigger : ECL(1&5) & CDC(1&5) gg trigger : ECL(1&5) & CDC(0&0) Generate triggers by matching with track information ! gX trigger : ECL(1)+CDC(0) & Bhabha/gg veto Mini-Trigger/DAQ workshop,OCU

  17. 1 5 Logic simulation study & & TRK 1 & 5 Mini-Trigger/DAQ workshop,OCU

  18. 3GeV 1 D 3GeV 5 D 7GeV D Threshold calibration Threshold table for r-z Threshold for r-f ( GeV ) Threshold calculation ON ON+OFF Mini-Trigger/DAQ workshop,OCU

  19. Threshold calibration Setting of threshold for all channels Mini-Trigger/DAQ workshop,OCU

  20. Expected L1 trigger rates @ 1035 super-KEKB • Estimated with current trigger performance • Depend on super-KEKB beam condition • Some flexibilities: • ETC & physics trigger region • Optimize btw trig efficiecny and trig rates • TC pulse width : 1ms • TC occupancy < 10KHz @ 1035 • Current L1 trigger system can be kept. Mini-Trigger/DAQ workshop,OCU

  21. L2/L3 trigger @ 1035 super-KEKB • It’s rather difficult to make concrete plan to prepare L2/L3 triggers before Trigger+DAQ readout scheme is finalized. slow preAmp Shaper Flash-ADC L2/L3 PC farm • Software triggers for ECL • ET balance • ECL/CDC matching • TC hitmap pattern • Total Energy • Cluster finding logic fast ECL L1 trigger GDL CDC L1 trigger KLM L1 trigger Mini-Trigger/DAQ workshop,OCU

  22. CsI(Tl) Barrel + pure-CsI Endcap • Current trigger system should be modified to accommodate both outputs in the trigger level. • Simple(?) concept to modify endcap electronics : • preAmp  fast shaper  STM for Barrel region • preAmp  new fast shaper  STM for endcap region • pulse height correction + active timing delay • potential problem of trigger timing resolution Mini-Trigger/DAQ workshop,OCU

  23. Summary • Current ECL trigger works well and new Bhabha trigger system is in progress. • We expect the new system to be implemented before KEKB winter shutdown. • Current ECL trigger system can be used at 1035 super-KEKB. • Trigger electronics R&D work is necessary if pure-CsI is chosen to endcap calorimeter. Mini-Trigger/DAQ workshop,OCU

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