1. Claudio Cerri, Riccardo Fantechi, Luigi Di Lella
New CHOD
prototype tests
at CERN
V. Duk, I. Mannelli
+ help from
Claudio Cerri, Riccardo Fantechi, Luigi Di Lella
V.Duk, I.Mannelli 1 1

2. Current status of the New CHOD Setup for tests at CERN
plan
Current status of the New CHOD
Setup for tests at CERN
First results with Standard Tile
Conclusions
V.Duk, I.Mannelli 2 2

3. Current status of the New CHOD
Design from Italo:
1 plane
148 slabs 265x107x30 (Standard Tile)
Fiber readout, 18 fibers per slab
PM or SiPM readout
SiPM: 2 readout channels per slab in coincidence
See Italo’s talk at MUV/CHOD WG,
V.Duk, I.Mannelli 3 3

4. Tests of the new CHOD Standard Tile: 265x107x30 Protvino:
EJ x100x20, 200x100x20, 300x100x20
Bicron 150x150x20
Fiber&direct SiPM readout (SiPM CPTA-146, PM Hamamatsu 7400U, SenSL)
Direct PM readout (Hamamatsu 7400U)
Talks at weekly meetings ( , ) and MUV/CHOD WG ( , )
Mainz:
Protvino scintillator 420x60x10, 390x100x15
Fibers with d=1.2 mm
PM readout (Hamamatsu R6095)
Talk at MUV/CHOD WG
Naples:
Mainz setup
Double SiPM readout (Hamamatsu 6x6 mm)
Standard Tile:
265x107x30
CERN:
Standard Tile
Double SiPM readout (Hamamatsu 3x3 mm)
Talk at Weekly meeting
V.Duk, I.Mannelli 4 4

5. Setup at CERN Main goal: Scintillator to test Standard Tile
Fiber arrangement
Main goal:
to test Standard Tile
Scintillator
(made in Protvino):
265x107x30
2 trigger counters:
80x40x10 (top), 40x40x5 (bottom)
PMT readout
~ ps time resolution per counter
Fibers:
BCF-92, d=1.0 mm
18 fibers glued (9 from one side, 9 from the other)
2nd Standard Tile from Ferdi in preparation
PM(top)
scintillator
Readout:
2 SiPM Hamamatsu S P 3x3 mm2
Preamplifier from Frascati
PM(bottom)
Data acquisition:
Lecroy Wafesurfer 44xs (2.5 GS/s)
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6. Data & analysis Data sample: 22.08.2013, 3369 triggers Trigger:
PM(top) & PM(bottom)
Offline threshold for time measurements: 50mV
Data recording:
Lecroy Wavesurfer 44xs, 4 channels with an external trigger
CH1: PM(top)
CH2: PM(bottom)
CH3: SiPM(right)
CH4: SiPM(left)
“software CFD” correction:
Calculate maximum Umax
Take time at 0.2*Umax
V.Duk, I.Mannelli 6 6

7. Signals from PMs Small amplitudes: inclined muons
Large amplitudes (peak at mV): MIP
Amp, V
Amp, V
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8. Signals from SiPMs Good light yield: > 30 p.e. 1 p.e. ~ 20 mV
<A> ~ 600 mV
Good light yield:
> 30 p.e.
Amp, V
Amp, V
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9. Amplitude correlations
PM:
amplitude configuration can be small-small, big-small, big-big (good particle)
Large amplitudes correspond to slewing corrections
Amp, V
Amp, V
Amp, V
dt, ns
Amp, V
Amp, V
SiPM:
Good correlation
Transparent scintillator
Amp, V
Amp, V
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10. Time resolutions σ ~ 0.96 ns σ ~ 0.92 ns σ ~ 0.74 ns σ ~ 0.84 ns
T(SiPM left) –T(trg)
T(SiPM right)–T(trg)
σ ~ 0.96 ns
σ ~ 0.92 ns
dt, ns
dt, ns
T(SiPM,mean) – T(trg)
dT(SiPM)
σ ~ 0.74 ns
σ ~ 0.84 ns
dt, ns
dt, ns
SiPM time:
software CFD correction
PM time: no time correction
Time resolutions from solving system of equations:
SiPM left: ~0.56 ns
SiPM right: ~0.48 ns
Trigger: ~0.78 ns
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11. High PM amplitudes σ ~ 0.85 ns σ ~ 0.82 ns σ ~ 0.72 ns σ ~ 0.73 ns
T(SiPM left) –T(trg)
T(SiPM right)–T(trg)
σ ~ 0.85 ns
σ ~ 0.82 ns
dt, ns
dt, ns
T(SiPM,mean) – T(trg)
dT(SiPM)
σ ~ 0.72 ns
σ ~ 0.73 ns
dt, ns
dt, ns
SiPM time:
software CFD correction
PM time: no time correction
Time resolutions from solving system of equations:
SiPM left: ~0.54 ns
SiPM right: ~0.49 ns
Trigger: ~0.66 ns
V.Duk, I.Mannelli 11 11

12. THANK YOU!!! conclusions Standard Tile is prepared Setup is working
Time resolution ~0.5ns obtained (after corrections)
Np.e.>30
THANK YOU!!!
V.Duk, I.Mannelli 12 12

13. spares
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14. PM time resolution dt, ns dt, ns dt, ns dt, ns 14 28.08.2013
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15. Risetime (Tmax – T0.2max) dt, ns dt, ns dt, ns dt, ns 15 28.08.2013
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16. Change in risetime/amplitude
Temperature effects
Change in T
Change in V(breakdown)
Change in HV-V(breakdown)
Change in gain
Change in risetime/amplitude
V.Duk, I.Mannelli 16 16

17. Selected events
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