Performance of new strip scintillator

Jungeun Lee, Jaeyun Choi, Kyungpook National University

Minseok Park

Ⅰ. Introduction

Ⅱ. Experimental Setup

Ⅲ. Result of Measurement

Ⅳ. Conclusion

Contents

Recently produced strips : width all 5mm

Configurations

Strip 4 used to DESY prototype45mm X 10mm X 3mm (fiber)[White paint cover]

The strip used to FNAL prototype 45mm X 10mm X 3mm (fiber, silver film cover)

Strip 1. (fiber)45mm X 5mm X 3mm

Strip 2. (direct readout) 45mm X 5mm X 3mm

Strip 3. (direct readout)45mm X 5mm X 2mm

5 Types of scintillators

FNAL versionStrip

Strip 1 Strip 2 Strip 3 DESY versionStrip

10mm

5mm

Ⅱ. Experimental setupThermostat chamber

Scanning stageTriggerPMT

Readoutcircuit

Signal

Triggerlogic

VME ADC

Sig IN

Gate IN

Voltage source

Biasvoltage

PC

Scannercontroller

MPPC Beta

rayCollimated b - ray

Automated2-D scanning system

MPPC

Beta-ray Source(137Cs)

Experimental Setup(trigger)

Trigger scintilla-tor

Target scintilla-tor MPPC

Trigger logic process

and

AMP

Target scintilla-tor

Trigger scintilla-tor

MPPC

Scintillator testing with Motor Control System

Analysis procedure

• For the data collected at each point Take ADC distribution with beta-ray signal Cut the pedestal part, take average of signal region The average shows strip response at this point Repeat same thing for all the point

Cut here !

Take aver-age of This region

ped

signal

1-d projection part is just this part.

1) FNAL version vs DESY versionⅢ. Result of Measurement

DESY ver-sionStrip 4

FNAL ver-sionStrip

Silver film white paint

The Comparison of the covering materials

while other conditions are same

FNAL versionwith Silver cover

DESY version with white paint

Standard resultAs reference

Light yield is slightly lower but uniformity Is better.

990-860~130

760-740~20

1) FNAL version vs DESY version

2) FNAL version vs 5mm Width strip

Strip15mm (fiber)

FNAL ver-sionStrip 10mm

10mm

5mm

The Comparison of the width

while other conditions are same

2) FNAL version vs 5mm Width strip

FNAL version width 10mm

Standard resultAs reference

Strip 1 width 5mm

Light yield is muchlower but uniformity Is better.

990-860~130

500-480~20

3) With silver cover vs Without cover(5mm)

The Comparison of the Existence of silver cover

while other conditions are same

3) With silver cover vs Without silver cover(5mm)

Strip 1With

silver cover

Strip1Without

silver cover

The strip1 with silver cover gets higher Light yield. And uniformity is same.

500-480~20

350-330~20

4) With fiber vs Direct readout (5mm)

Strip2(Direct readout)

Strip1(fiber)

Comparison of the existence of fiberCompare strip with fiber and direct readout while other conditions are same

Strip 1With fiber

Strip 2 Direct read-

out

4) With fiber vs Direct readout(5mm)

The strip1 with fiber gets lower Light yield than strip2But uniformity is better.

500-470~30

930-870~60

5) Thickness : 3mm vs 2mm(Direct readout)

Strip3Thickness: 2mm

Strip2Thickness: 3mm

Comparison of the Thickness of stripwhile other conditions are same

5) Thickness : 3mm vs 2mm(Direct readout)

Strip 3 Thickness 2mm

Strip 2 Thickness

3mm

The strip3(2mm) gets little higher Light yield than strip2(3mm).But uniformity is worse.

930-880~50

950-830~120

Ⅳ. Conclusion FNAL version(silver cover) vs DESY version(white paint)

Light yield : FNAL version > DESY version Uniformity : FNAL version < DESY version

FNAL version(10mm width) vs Strip1 (5mm width)

Light yield : FNAL version > 5mm Width strip Uniformity : FNAL version < 5mm Width strip

5mm width strip is not good for getting higher light signalBut, Its uniformity is better than FNAL version.

Ⅳ. Conclusion

• With silver cover vs Without silver cover (5mm)

Light yield : With silver cover > Without silver cover Uniformity : With silver cover ~ Without silver cover

• With fiber vs Direct readout (5mm)

Light yield : With fiber < Direct readout Uniformity : With fiber > Direct readout

• Thickness : 3mm vs 2mm(Direct readout)

Light yield : Thickness : 3mm < Thickness : 2mm Uniformity : Thickness : 3mm < Thickness : 2mm

Plan Polishing the strip Silver painting Checking the strip clearly by using the micro-

scope Improving the manufacturing system

* Long term plan Making more stable system Developing optical simulation

Reflector

Photosensor