UNIFORMITY STUDY OF INO ICAL’S RESISTIVE PLATE CHAMBER

BY HARIKRISHNAN.A

INO DHEP

Introduction

• Scintillator is a material which emits light(scintillations) when an ionization radiation falls on it.

• Plastic scintillator are used.• PMT(Photo Multiplier Tube)- A device which converts

light into electric current.• Light guides are used to carry light from scintillator to

PMT• Discriminator – An electronic circuit which converts

analog signal to a digital pulse.

ref1

ref2

Test

2-fold

3 -fold

Efficiency= (3-fold/2-fold)*100

Delay is added(15ns)

Calculation Of Efficiency

Discriminator 1

Discriminator 2

Discriminator 3

• Delay: One of the pulse is delayed to decrease time jitter in the coincidence pulse.

• The threshold for both the reference paddle is set to -25 mV and the test paddle is set as -20 mV

Ref 1

Ref 2

L Test

2-fold

3 -fold

Delay is added (15 ns)

U Test

3 -fold

Delay is added (20 ns)

Delay is added (30 ns)

Calculation of Operating Point

Threshold for all the paddles were set as -25 mV

Efficiency v/s voltage graph of test paddle 1

0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 20

10

20

30

40

50

60

70

80

90

100

Chart Title

Series1

Voltage (kV)

Efficiency

Efficiency v/s voltage graph of test paddle 2

0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 20

10

20

30

40

50

60

70

80

90

100

Chart Title

Series1

Voltage (kV)

Efficiency

Zonal Efficiency Of RPC

• RPC is placed between two scintillators and will find the efficiency.

• Our paddles have the area 10cm*10cm.

14 cm

14 cm

Paddle 1

Paddle 2

RPC

6 5 4 3 2 1 0

5

4

3

2

1

As shown in the figure above, in order to calculate the efficiency, we consider the hits in x strips-0 1 2 3 4 and y strips-0 1 2 3 4

Schematic Diagram

Discriminator 1

Paddle1

Paddle 2

RPC

Discriminator 2

2 fold

INO DAQSYSTEM

Efficiency= (3fold/2fold)*100

PLOT

Acknowledgement

• Dr. B.Satynarayana• Mr.Sumanta Pal• Mr.Ravindra Shinde• Sudheshna Das Gupta• S.S Chavan, Vishal

THANK YOU