Status report on Cosmic Ray Tagger for 3x1x1/6x6x6, and observation of upward going particles in WA105 I. Kreslo LBNODEMO/WA105 bi-weekly science board meeting 12.10.2016 1
Reference documents for the CRT design http://lbnodemo.ethz.ch:2500/3x1x1/35 : 1. feb-v3-0-1.pdf: description of FE electronics and communication 2. sbnd-crt-part1,2: technical design note for SBND CRT (90% compatible) 3. missing: 3D CAD model for 3x1x1 2
Scintillating module 16 strips per module Strip width: 112 mm Strip length: 1755mm Module size: 1.8x1.8m Aluminum case (2 mm thick) Feed-through PCB 3 32 coax cables inside
Scintillating strip Scintillator: USMS-03 (PS+PTP+POPOP) Reflective surface (UNIPLAST technology) WLS fibers: Kuraray Y11(200)MS, 1mm diameter Optical glue: ESA 7250 polysiloxane compound SiPM: Hamamatsu S12825-050P 2 SiPMs per strip 4
Front-End Board Rev3 180 pieces produced, tested. (50 for uBooNE + 130 for SBND) 20 more are ordered. 5
Plane geometry 1800 12 CH15 CH0 1755 1800 1792 33 4 112 6
Installation at 3x1x1 cryostat Gate side (S) 7.3m 1.565m 20.0mm 1.930m 1.800m 1.545m 100.0mm 1.910m Position precision ±3 mm Wall side (N) 7
Timing reference signal distribution CH 0 065 065 TODO: install WR Client unit for PPS T1 T0 TOUT TIN TIN TOUT 066 10 ns T0 T1 068 TIN 70 ns TOUT T0 T1 070 WR PPS 10 ns T1 T0 TOUT TIN 8
Trigger signal distribution CH 0 Each pair works in local X-Y coinc. mode 065 065 Triggers from each plane delivered to logic unit, any coinc. logic can be realized there for TPC T1 T0 TOUT TIN TIN TODO: TOUT 066 replace TTL-NIM-TTL T0 check logic unit T1 eventually replace with Bern unit 068 TIN TOUT T0 T1 X1 070 TRIG TO TPC Y1 COINC LOGIC Y2 T1 T0 TOUT TIN X2 9
Data readout Event: 065 065 flags ts0, ns (time w.r.t T0) J2 J1 ts1, ns (time w.r.t T1, not used) J1 ADC[32] J2 066 068 J1 J2 070 J2 J1 eth1 DAQ SERVER CAT5 ethernet cable 10
Muon TOF test results (~6 days accumulated) TOF resolution ~4.4 ns Upward-going muons(?) Detected muon flux: N->S direction: ~3.1 muons/min S->N direction: ~3.6 muons/min 11
Muon flux angular distribution 12
Upward going muons at surface ( literature refs ) - Lack of information or not very reliable measurements - PDG review on cosmic rays says almost nothing about flux near horizon - “Effects of upward-going cosmic muons on density radiography of volcanoes” K. Jourde et al., arXiv:1307.6758v1 Question remains: Low or high energy? (Scattered or through-going?) - Monte Carlo simulation for background study of geophysical inspection with cosmic-ray muons, R. Nishiyama et al., Geophys. J. Int. (2016) 206, 1039–1050 13
Upward going muons at 3x1x1 S->N N->S Proposal: measure energy spectrum of particles near (below) horizon with the TPC data. (if fast- delta ray count, delta ray spectrum, shower reco; if slow - MCS, dE/dx) Clarify “through-going vs scattered” dilemma. 14
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