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FINUDA TRIGGER

FINUDA TRIGGER. Simonetta Marcello - Torino Paola Gianotti - LNF Fulvio Pompili - LNF Aldo Zenoni (MC) - Brescia Francesca De Mori (OA) - Torino …. …. FINUDA Collaboration Meeting Trieste, May 6-7 2004. Simonetta Marcello - Torino. FINUDA TRIGGER Strategy. Accurate TIMING is CRUCIAL

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FINUDA TRIGGER

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  1. FINUDA TRIGGER Simonetta Marcello - Torino Paola Gianotti - LNF Fulvio Pompili - LNF Aldo Zenoni (MC) - Brescia Francesca De Mori (OA) - Torino …. …. FINUDA Collaboration Meeting Trieste, May 6-7 2004 Simonetta Marcello - Torino

  2. FINUDA TRIGGER Strategy Accurate TIMING is CRUCIAL to select events from background For more details: ISEO 2002 • SELECTIVE TRIGGERbased on fast detector (TOF) and electronics • MODULAR and PROGRAMMABLE STRUCTUREto have a flexible configuration • CARE of TRIGGER DESIGN from the beginning to cope with high rates (up to 30 MHz) • Dedicated MC SIMULATION physical events, background (Touschek) [2000: G.Gomez- 2003: A. Zenoni] • Latency ~ 200 nsat First Level • RF signal not used at all in the Logic (due to old FEE on detectors) RF: 380 MHz (interbunch time 2.6 ns) F rate ~ 400 Hz , interaction time 2 ms HYP rate < 1Hz Bhabha < 200 Hz • Asynchronous Trigger (continous source of events) L = 1032 cm-2 s-1 FINUDA TRIGGER - Simonetta Marcello - TS 6/5/04

  3. TRIGGER STRATEGY • Level 0 • selection is made using TOFINO signals • here trigger is asynchronous • Level 1 • selection includes TOFONE signals • synchronization is given by level 0 • Selections • energy loss • topology • multiplicity • Dtof (In-Ext barrels) Mean Timing signals to identifiy hit slabs ISEO 2002 FINUDA TRIGGER - Simonetta Marcello - TS 6/5/04

  4. TRIGGER LOGIC MLU Exclusive BTB 1-1 BTB (Bhabha, not used for triggering) PAL Exclusive BTB 1-3 OR-MB BTB (Bhabha + KsKl) PAL NOT Excl BTB 1-3 OR-EL TOFINO LThr MT K+K- MULT SEL HYP 2-7 HYP Mult S MALU Gate from OR Tofino TOFINO HThr MT Gated OR TOFONE MULT SEL BHABHA 2-7 TOFONE MT MULT TOFONE > 1 S DISC PCoin narrow window S BHABHA Mult TIMING alignment Reference: photodiode OR-TOFONE Prompt Coincidence (less m +) Slow Coincidence (only m +) LASER FINUDA TRIGGER - Simonetta Marcello - TS 6/5/04

  5. TRIGGER LOGIC PLU System + PRESC HYP BTB K+K- BHABHA MULT HYP BTB Bhabha COSM MULT Bhabha OR TOFINO OR MB OR TOFONE OR TOFONE MULT TOFONE > 1 MULT TOFONE > 1 LASER PhDiode LASER BASIC TRIGGERS FINUDA TRIGGER - Simonetta Marcello - TS 6/5/04

  6. Moduli VME (Heart of Trigger Logic)progettati e realizzati da Silvano Gallian Electronic Lab - Torino INFN) • Pattern Recognition LE297 BtB Topologies OK • Multiplicity Selector LE308 HYP, BHA multiplicities OK • Prescaler LE312 prescaling triggers OK • Prompt Coincidence LE301 Dtof Tofino-Tofone Not working in CRoom! Already repaired, it still gives problems of noise. New tests and/or design needed Estimated time 6 m.u. FINUDA TRIGGER - Simonetta Marcello - TS 6/5/04

  7. SELECTION OF HYP EVENTS Background rejection for HYP Trigger High rejection power Real HYP TRIG Rate ~ 7 Hz @ L ~ 4x1031cm-2s-1 Rates @ L = 1032cm-2s-1 RUN 2003-04 MC ISEO 2002 Rate TOFINO ~ 400 kHz ! FINUDA TRIGGER - Simonetta Marcello - TS 6/5/04

  8. SELECTION OF BHABHA EVENTS Background rejection for Bhabha Trigger Real BHABHA TRIG Rate ~ 15 Hz @ L ~ 4x1031cm-2s-1 Rate @ L = 1032cm-2s-1 RUN 2003-04 ? Maybe Tofino efficiency for mip MC ISEO 2002 FINUDA TRIGGER - Simonetta Marcello - TS 6/5/04

  9. TRIGGER EFFICIENCY Need of TOF Calibration TRIGGER Efficiency for BHABHA selection Beam Runs Dec 2003 with Trigger ORTofino*ORTofone Pattern Recognition exclusive BTB 1-3 Topologies 95% evaluated on TDC hits 98% evaluated on MT hits Multiplicity Selector * BTB1-3 Mult 2-7 on Tofone 90% evaluated on TDC hits 99% evaluated on MT hits ? evaluated on MT hits inside Tofino gate FINUDA TRIGGER - Simonetta Marcello - TS 6/5/04

  10. TRIGGER EFFICIENCY What about Trigger Efficiencyfor HYP selection ? Maybe not enough statistics on Beam Runs 2003-04 with Trigger ORTofino*ORTofone We have to check including last runs FINUDA TRIGGER - Simonetta Marcello - TS 6/5/04

  11. Trigger Timing Timing Alignment with LASER ? MT Tofino (jitter/jump ~ 10 ns) MT Tofone (jitter < 2ns) Maybe due to CFD FINAL Timing Alignment with with beam collisions Due to not “safe calibrated” optical fibers Between Tofino and Tofone (Basic Trigger signals) Loose Timing Need of TOF Calibration to measure real length of fibers FINUDA TRIGGER - Simonetta Marcello - TS 6/5/04

  12. Trigger Timing SELECTION OF HYP EVENTS promptp- K+ mean lifetime = 12.4 ns • Fast coincidence (Dtof) • custom VME module • Multiplicity >= 1 (Ext TOF) • custom VME module Dtof Inner-Outer Barrels m+ from K+ decay prompt p - MC ISEO 2002

  13. Common STOP Safe Timing > 10 ns 8 double ANDs, 1 gate Progettato e realizzato da Fulvio Pompili (INFN-LNF) OR Tofino (Physics , Cosmics) OR Tofone (Cosmics) Photodiode (LASER) RF (not used, but read out on dedicated TDC) Programmable Choice using Output Register CES1320 + ST03 FINUDA TRIGGER - Simonetta Marcello - TS 6/5/04

  14. TO BE or NOT TO BE Times with Physics MeaningDTOF (particle time of flight between Tofino and Tofone) Computing differences RF expires NO advantage RF for Physics (on all TDCs) OR RF not used, but read out on dedicated TDC Resolution still depends on Tofino and Tofone ones FINUDA TRIGGER - Simonetta Marcello - TS 6/5/04

  15. Higher Levels of Trigger 4 TOF used at 1st Level 4 LMD and STB not useful alone at 2nd Level 4 SILmost interesting information to be manage at 2nd Level, BUT unfortunately too slow (> 15 ms) Filippini/Panzarasa TALK Maybe useful at 3rd Level TOF again at 2nd Level ? Do we need a strict selection ? FINUDA TRIGGER - Simonetta Marcello - TS 6/5/04

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