SIDIS trigger study Yuxiang Zhao.

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Presentation transcript:

SIDIS trigger study Yuxiang Zhao

Planned trigger detectors SIDIS electron trigger Forward angle: EC + LGC + SPD + MRPC Large angle: EC + SPD SIDIS hadron trigger EC + SPD + MRPC (could be different depending on further study) Working plan Get singles rate on each detectors for different particles Get total singles rate with detector coincidence electron-like total rate hadron-like total rate Estimate electron-like & hadron-like random coincidence rate Estimate Real physics SIDIS rate with SIDIS generator

Forward electron trigger EC + LGC + SPD + MRPC SPD threshold: 0.35 MeV MRPC threshold: edep of 16eV in one gap and at least 5 gaps to be fired

SIDIS forward electron trigger ---Individual detectors Using Wiser generator Singles particle EC Rate (kHz) LGC Rate(KHz) SPD Rate(MHz) MRPC All 4 fired electron 82.8 169 3.3 1.9 64.4 Pim 861 82.4 15.5 14.4 6.2 Pip 1036 85.7 18.7 17.6 7.2 Pi0 2210 2045 10.8 7.6 88.1 Total: 4193 2382 49 41.5 166.5 Total electron-like trigger rate in forward angle: 166.5 KHz + random coincidence among detectors Random coincidence: if track match is done with 10 segmentations in each detector, random coincidence rate=55Hz

Large angle electron trigger EC + SPD SPD threshold: 0.35 MeV

SIDIS large electron trigger ---Individual detectors Using Wiser generator Singles particle EC Rate (kHz) SPD Rate(MHz) Both fired Rate(KHz) electron 4.47 2.3 4.3 Pim 9.8 17.7 9.1 Pip 10 21.8 Pi0 18.5 7.8 Total: 42.8 49.6 25.7 Total electron-like trigger rate in forward angle: 25.7KHz + random coincidence among detectors Random coincidence: if track match is done with 10 segmentations in each detector, random coincidence rate=914Hz

SIDIS hadron trigger EC + SPD + MRPC

SIDIS hadron trigger Wiser curve and wiser data EC Rate (MHz) SPD Singles particle EC Rate (MHz) SPD Rate(MHz) MRPC All 3 fired electron 0.21 3.5 1.9 0.17 Pim 13.7 15.7 14.4 12.1 Pip 16.7 19.1 17.6 14.8 Pi0 17.5 10.8 7.6 2.5 Total: 48.1 49.1 41.5 29.6 Total hadron rate based on EC+SPD+MRPC = 29.6 MHz + random coincidence among detectors Random coincidence: if track match is done with 10 segmentations in each detector, random coincidence rate=84KHz

Electron-like & hadron-like random coincidence ---assuming 30 ns window Forward angle electron trigger rate: 166.5KHz Large angle electron trigger rate: 25.7KHz Hadron trigger rate: 29.6MHz e&h random coincidence rate: (144KHz+29.8KHz)*29.58MHz*30ns=176KHz No detector correlations study yet, should be taken into account

My concern for hadron trigger Forward electron trigger: EC(high threshold)+LGC+SPD+MRPC Forward hadron trigger: EC(low threshold) + SPD+MRPC Those particles passed electron trigger in the forward angle will also pass hadron trigger: will cause additional e&h coincidence rate by 144KHz in the forward angle VETO on LGC ??? Not practical, could have an electron in this sector Make judgement on hit position on EC??? Will have bias on phi_h Only inclusive triggers in forward angle??? A big project, not doable shortly

Hit position constraint to form hadron trigger ---5 cm away from electron trigger Using singles particle to do a test Pid Pass electron trigger (kHz) Pass electron trigger and hadron trigger without R constrain Pass electron trigger and hadron trigger with R constrain electron 42 11.3 pim 6.2 0.8 pip 8.1 1.3 pi0 89.7 37.6 Electron trigger and hadron trigger at forward angle has a correlation of about 35% e&h trigger correlation in the forward angle will give additional 51kHz coincidence trigger rate

SIDIS trigger rate by using wiser e&h random coincidence:(144KHz+29.8KHz)*29.58MHz*30ns=154KHz e trigger and hadron trigger correlation in forward angle: 51KHz SIDIS physics rate: ~10KHz Detector correlations---impact on e or h rates---haven’t been studied yet

To-do list for SIDIS trigger rate estimation Update EC response using Hall D generator (Rakitha) Update SPD threshold (Sanghwa) Update MRPC threshold (Sanghwa) Hadron-like trigger rate estimation done by using wiser based study Define how to do “track match” at trigger level to reduce random coincidence rate (among detectors)  10 segmentations in phi dimension (3 adjacent sectors) Efficiency study by combining all the individual detectors in the trigger design

Backups

SIDIS hadron trigger Wiser curve and wiser data EC Rate (MHz) SPD Singles particle EC Rate (MHz) SPD Rate(MHz) MRPC All 3 fired All 3 fired + lgc veto (MHz) electron 0.14 2.0 1.16 0.11 0.047 Pim 13.7 15.7 14.4 12.1 12.06 Pip 16.7 19.1 17.6 14.8 14.76 Pi0 17.5 10.8 7.6 2.5 1.81 Total: 48 47.6 40.8 29.5 28.7 By putting a VETO on LGC for hadron trigger, we almost keep all the pi+/- Forward electron trigger now doesn’t have any overlap with hadron trigger

SIDIS forward electron trigger ---EC singles rate Singles particle Rate (kHz) electron 53.9 Pim 864 Pip 1036 Pi0 2210 Total: Using Wiser generator

SIDIS forward electron trigger ---LGC singles rate with threshold=2 p SIDIS forward electron trigger ---LGC singles rate with threshold=2 p.e & 2 pmts Singles particle Rate (kHz) electron 77.2 Pim 82.4 Pip 85.7 Pi0 2045 Total: Using Wiser generator

SIDIS forward electron trigger ---SPD singles rate with threshold=0 SIDIS forward electron trigger ---SPD singles rate with threshold=0.35MeV Singles particle Rate (MHz) electron 2.0 Pim 15.7 Pip 19.1 Pi0 10.8 Total: Using Wiser generator 60 pieces in phi dimension, 4 pieces in r dimension

Rate (MHz) Using Wiser generator SIDIS forward electron trigger ---MRPC singles rate with threshold=16eV and 5 laylers to be fired Singles particle Rate (MHz) electron 1.16 Pim 14.4 Pip 17.6 Pi0 7.6 Total: Using Wiser generator 60 pieces in phi dimension, 4 pieces in r dimension, 10 gas layers