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Trigger simulation update. Bruno Angelucci INFN & University of Pisa NA62 Physics WG meeting – Liverpool , 28/08/2013. Outline. Update on “classical” L0 rates and changes wrt my last table (10/04/13 Physics WG) CHOD and MUV3 digitizations CHOD primitive generation

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trigger simulation update

Trigger simulation update

Bruno Angelucci

INFN & University of Pisa

NA62 Physics WG meeting – Liverpool, 28/08/2013

  • Update on “classical” L0 rates and changes wrt my last table (10/04/13 Physics WG)
    • CHOD and MUV3 digitizations
    • CHOD primitive generation
    • LKr L0 first simulation
    • LAV (was missing)
  • First attempt to simulate a L0TP matching primitives from different subdetectors
  • Preliminary rate for a rare process trigger
timing and digitization chod and muv3
Timing and digitization – CHOD and MUV3
  • As already explained in my last talk (Physics WG 05/06/13) I modified the present naive digitization to take into account the correct time of the hit inside the MC event and the possibility to have more then one hit on the same channel.
  • However this is not a “real” digitization! (no PMTs, no dead time, no time propagation inside CHOD slabs)
  • This implementation is based on the study of the time profile of each scintillator.







primitive generation
Primitive generation
  • Time information is used for the primitive generation. The output of each trigger routine is a timestamp+fine time sent to L0TP.
  • CHOD: coincidence is made in space (hit in correspondent quadrants) and now also in time: I use 2 ns.

One primitive for coincidences within 1 ns.

  • RICH: multiplicity (between 4 and 32) evaluated in time bins of 1 ns.
  • MUV3: one primitive for one or more hits in time within 1 ns.
lkr l0 simulation
Lkr L0 simulation
  • The idea istoimplementat a certainapproximationwhatwillbe the LKr L0 fromRomaTV.
  • Mainguidelinesforthis first simulation:
    • SuperCellsof 4x4 channelsgrouped in 28 TEL62s, first stage withhorizontalcheck.
    • Up tonow, 25ns sample structurefromdigitizationisnotsignificant: peakenergyhasbeenusedwithouttime
    • Second stage of 7 TEL62 forverticalcheck.
    • Final primitive production: up toknow, no timebutonly a trigger information concerning the numberof “clusters”.
issues with digitized data
Issueswithdigitized data
  • Here a eventisrepresented in energyreleasefrom MC
issues with digitized data 2
Issueswithdigitized data - 2
  • High inefficiencyforpions and low energyphotons due to the gain vs cellenergyrelease and the difficultytochoose a threshold
  • First attempttouse just the ADC countsof the peak
issues with digitized data 3
Issueswithdigitized data - 3
  • The routine toconvertfrom ADC countstoenergyhasbeenused
  • Still some difficultiestochoose a threshold and todistinguishbetweennoise and low energycells: mostprobably due tomylackofknowledgeconcerning the calorimeter data handling
current trigger efficiency photons
Current trigger efficiency - photons


γhit LKr


current trigger efficiency pions
Current trigger efficiency - pions


πhit LKr


lav in l0
LAV in L0
  • All LAV station havebeenincluded in primitive generation
  • Timeoffsetsbetween station havebeenevaluated
  • In single station, time spread ofabout 10 ns: slewingcorrectionnotimplemented, low threshold and onlyleadingused, offset betweenlayersnotcomputed…othersuggestionsfrom LAV people?
lav primitive generation
LAV primitive generation
  • Alltime are expressed in the LAV12 timeusing station offsets
  • Due to the 10 nsuncertainty, primitive are nowcomingfromhitswithin 10 ns, obviouslyunacceptablefor a veto!
lav in pinunu
LAV in pinunu
  • After the signalselection, halfof the eventshave a primitive fromLAVs, mainly LAV11 and LAV12
  • Primitive are both in time and not in time, and the situation can bebetterunderstoodlooking at the position where the pionstops
  • Combiningthiswith the 10 ns primitive matchingleadsto a big loss of trigger efficiencyfor the signal
l0 rate table no primitives matching
L0 rate table – no primitivesmatching
  • CHOD: 1 or more quadrants
  • RICH: between 4 and 32 hit
  • MUV3: at leastone hit
  • LKr: 2 or more clusters
  • LAV: at leastone hit in a station
  • rate with1 or more cluster in LKr dropsto 128kHz after !LKr and 8kHz after !LAV, butefficencyalsodropsto 68% and 39%
l0 rate table primitives matching
L0 rate table – primitivesmatching
  • CHOD: 500ps resolution
  • RICH: 100ps resolution
  • MUV3: 500ps resolution
  • No LKr
  • LAV: 1.5ns resolution
  • Ratessufferfrom LKr missing in thischain
  • Efficiencywouldprobablybebetterimproving LAV timing
  • Roughlysameresultswithsamechainwithouttimematching
possible trigger for process
Possible trigger forprocess
  • CHOD: 2 or more quadrants
  • MUV3: at leastone hit
  • LKr: 2 or more clusters
  • Couldbefeasiblewith a reducedintensity or downscaled
future plans
Future plans
  • L0 simulation, main trigger
    • Add MUV3 new digitization from Riccardo and Luigi
    • Try something more than total multiplicity in RICH
    • LAV timing: slewing, offsets, thresholds
    • LKr timing and calibration
    • Add halo with timing
    • Try different resolutions and matching times in L0TP simulation
  • L1 and L2 software algorithms
  • Trigger rates for other rare K+ and π0 decayslooking at the first data takingof 2014