Download - New CHOD prototype tests at CERN

New CHOD prototype tests

at CERN

V. Duk, I. Mannelli + help from

Claudio Cerri, Riccardo Fantechi, Luigi Di Lella

128.08.2013 V.Duk, I.Mannelli

2

plan


1.Current status of the New

CHOD

2.Setup for tests at CERN

3.First results with Standard Tile

4.Conclusions

3

Current status of the New CHOD


Design from Italo:1 plane148 slabs 265x107x30 (Standard Tile)Fiber readout, 18 fibers per slabPM or SiPM readoutSiPM: 2 readout channels per slab in coincidence

See Italo’s talk at MUV/CHOD WG, 05.06.2013

4

Tests of the new CHOD


Protvino:EJ200 100x100x20, 200x100x20, 300x100x20Bicron 150x150x20Fiber&direct SiPM readout (SiPM CPTA-146, PM Hamamatsu 7400U, SenSL)Direct PM readout (Hamamatsu 7400U)Talks at weekly meetings (28.02.2013, 23.05.2013) and MUV/CHOD WG (05.06.2013, 28.08.2013)Mainz:Protvino scintillator 420x60x10, 390x100x15Fibers with d=1.2 mmPM readout (Hamamatsu R6095)Talk at MUV/CHOD WG 10.04.2013

Standard Tile: 265x107x30

Naples:Mainz setup Double SiPM readout (Hamamatsu 6x6 mm)

CERN:Standard Tile Double SiPM readout (Hamamatsu 3x3 mm)Talk at Weekly meeting 18.07.2013

5

Setup at CERN


Scintillator(made in Protvino):265x107x30

Fibers:BCF-92, d=1.0 mm18 fibers glued (9 from one side, 9 from the other)

Readout: 2 SiPM Hamamatsu S10931-050P 3x3 mm2

Preamplifier from Frascati

2 trigger counters:80x40x10 (top), 40x40x5 (bottom)PMT readout~500-600 ps time resolution per counter

Data acquisition:Lecroy Wafesurfer 44xs (2.5 GS/s)

Main goal: to test Standard Tile

scintillator

PM(top)

PM(bottom)

2nd Standard Tile from Ferdi in preparation

Fiber arrangement

6

Data & analysis


Data sample:22.08.2013, 3369 triggers

Trigger: PM(top) & PM(bottom)Offline threshold for time measurements: 50mV

“software CFD” correction:Calculate maximum UmaxTake time at 0.2*Umax

Data recording: Lecroy Wavesurfer 44xs, 4 channels with an external triggerCH1: PM(top)CH2: PM(bottom)CH3: SiPM(right)CH4: SiPM(left)

7

Signals from PMs


Small amplitudes: inclined muons

Large amplitudes (peak at 300-400mV): MIP

Amp, V Amp, V

8

Signals from SiPMs


1 p.e. ~ 20 mV<A> ~ 600 mV

Good light yield:> 30 p.e.

Amp, V Amp, V

9

Amplitude correlations


PM:amplitude configuration can be small-small, big-small, big-big (good particle)Large amplitudes correspond to slewing corrections

SiPM:Good correlation

Transparent scintillator

Amp, V

Amp, V Amp, V

Amp, V

Amp, V

Amp, V

Amp, V

dt, ns

10

Time resolutions


Time resolutions from solving system of equations:SiPM left: ~0.56 nsSiPM right: ~0.48 nsTrigger: ~0.78 ns

SiPM time: software CFD correction

PM time: no time correction

T(SiPM left) –T(trg)

σ ~ 0.96 ns

T(SiPM right)–T(trg)

dT(SiPM)T(SiPM,mean) – T(trg)

σ ~ 0.84 ns

σ ~ 0.74 ns

σ ~ 0.92 ns

dt, ns dt, ns

dt, ns dt, ns

11

High PM amplitudes


Time resolutions from solving system of equations:SiPM left: ~0.54 nsSiPM right: ~0.49 nsTrigger: ~0.66 ns

T(SiPM left) –T(trg) T(SiPM right)–T(trg)

dT(SiPM)T(SiPM,mean) – T(trg)

σ ~ 0.85 ns

σ ~ 0.72 ns

σ ~ 0.73 ns

σ ~ 0.82 ns

dt, ns dt, ns

dt, ns dt, ns

SiPM time: software CFD correction

PM time: no time correction

12

conclusions


Standard Tile is prepared

Setup is working

Time resolution ~0.5ns obtained (after corrections)

Np.e.>30

THANK YOU!!!


spares

14

PM time resolution


dt, ns dt, ns

dt, ns dt, ns

15

Risetime (Tmax – T0.2max)


dt, ns dt, ns

dt, ns dt, ns

16

Temperature effects


Change in T

Change in V(breakdown)

Change in risetime/amplit

ude

Change in HV-V(breakdown)

Change in gain

17

Selected events


Download - New CHOD prototype tests at CERN

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