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 prototype 45mm 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 version Strip Strip 1 Strip 2Strip 3 DESY version Strip 10mm 5mm

Ⅱ. Experimental setup Thermostat chamber Scanning stage Trigger PMT Readout circuit Signal Trigger logic VME ADC Sig IN Gate IN Voltage source Bias voltage PC Scanner controller MPPC Beta ray Collimated  - ray Automated 2-D scanning system MPPC Beta-ray Source ( 137 Cs)

Experimental Setup(trigger) Trigger scintillator Target scintillator MPPC Trigger logic process and AMP

Target scintillator Trigger scintillator 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 average of This region ped signal 1-d projection part is just this part.

1) FNAL version vs DESY version Ⅲ. Result of Measurement DESY version Strip 4 FNAL version Strip Silver film white paint The Comparison of the covering materials while other conditions are same

FNAL version with Silver cover DESY version with white paint Standard result As reference Light yield is slightly lower but uniformity Is better ~ ~20 1) FNAL version vs DESY version

2) FNAL version vs 5mm Width strip Strip1 5mm (fiber) FNAL version Strip 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 result As reference Strip 1 width 5mm Light yield is much lower but uniformity Is better ~ ~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 1 With silver cover Strip1 Without silver cover The strip1 with silver cover gets higher Light yield. And uniformity is same ~ ~20

4) With fiber vs Direct readout (5mm) Strip2 (Direct readout) Strip1 (fiber) Comparison of the existence of fiber Compare strip with fiber and direct readout while other conditions are same

Strip 1 With fiber Strip 2 Direct readout 4) With fiber vs Direct readout(5mm) The strip1 with fiber gets lower Light yield than strip2 But uniformity is better ~ ~60

5) Thickness : 3mm vs 2mm(Direct readout) Strip3 Thickness : 2mm Strip2 Thickness : 3mm Comparison of the Thickness of strip while 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 ~ ~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 signal But, 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 microscope  Improving the manufacturing system * Long term plan  Making more stable system  Developing optical simulation Reflector Photo sensor