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CHOD digitization: Preliminary ideas

CHOD digitization: Preliminary ideas. Viacheslav Duk INFN Perugia. 1. Current digitizaion. Energy deposit in a slab > 2MeV No time information. CHOD hit. Possible improvement: Add time Add TOT. Use TR data. 2. Old CHOD channel map. V-plane. H-plane. y. x. 3. Adding time.

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CHOD digitization: Preliminary ideas

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  1. V.Duk CHOD digitization: Preliminary ideas Viacheslav Duk INFN Perugia 1

  2. Current digitizaion V.Duk • Energy deposit in a slab > 2MeV • No time information CHOD hit • Possible improvement: • Add time • Add TOT Use TR data 2

  3. Old CHOD channel map V.Duk V-plane H-plane y x 3

  4. Adding time V.Duk • TR data (Run 390 – the best one): • Select slab #j (j=0−127) • Divide the slab #j into 16 intersection points (IP) • For each IPjj (jj=1−16) fit TIP−Tcedar (TIP – uncorrected time) by the gaussian (<TIP>, σ) • Fit <TIP> vsIPjj-coordinate (rIP) by the function F0 = kt*rIP + bt • Remember time function Ft = kt*rIP • Fit σvsrIP by Fσt = kσt*rIP + bσt <TIP> - average time for IPjj Subtract IP intrinsic resolution 5ns/m*0.09m/√12 ~ 0.13ns ??? • Digitization code: • Get MC track and calculate rIP • Calculate time Ft = k*rIP • Add smearing according to Fσt = kσt*rIP+ bσt 4

  5. Adding TOT V.Duk • TR data (Run 390 – the best one): • Select slab #j (j=0−127) • Divide the slab #j into 16 intersection points (IP) • For each IPjj (jj=1−16) fit TOT by the gaussian (<TOT>, σ) or take Mean and RMS • Fit <TOT> vsrIP by the function FTOT = kTOT*rIP + bTOT • Fit σvsrIP by FσTOT = kσTOT*rIP + bσTOT • CHOD digitization: • Get MC track and calculate rIP • Calculate time FTOT = kTOT*rIP + bTOT • Add smearing according to FσTOT = kσTOT*rIP + bσTOT 5

  6. Pictures for slab0 V.Duk TR Run 390 6

  7. Pictures for slab0 V.Duk T0 as a function of (IDX - 64) σ as a function of IDX red – without time corrections blue – with time corrections TOT as a function of IDX • Different slope because of different slab width • light propagation in the slab: 0.82ns/slab / 9.9cm/slab ~ 8ns/m (slightly overestimated because of slewing effect) • Worse resolution for small ID (statistics) • Worse resolution for large ID (light attenuation) • Hard to fit the dependence Take average value 7

  8. conclusions V.Duk • CHOD digitization should be improved • Possible improvement: to add time and TOT • TR data provide necessary information THANK YOU!!! 8

  9. V.Duk 9

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