Transcript ZONAL EFFICIENCY OF RPC

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.
Calculation Of Efficiency
Delay is added(15ns)
ref1
2-fold
Discriminator 1
ref2
Discriminator 2
Test
3 -fold
Discriminator 3
Efficiency= (3-fold/2-fold)*100
• 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
Calculation of Operating Point
2-fold
Delay is added (15 ns)
Ref 1
3 -fold
Ref 2
Delay is added (20 ns)
L Test
Delay is added (30 ns)
U Test
Threshold for all the paddles were set as -25 mV
3 -fold
Efficiency v/s voltage graph of test
paddle 1
E 100
f 90
f
i 80
c 70
i
60
e
n 50
c 40
y
30
20
10
0
0.9
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
Voltage (kV)
2
Efficiency v/s voltage graph of test
paddle 2
100
90
E
f
f
i
c
i
e
n
c
y
80
70
60
50
40
30
20
10
0
0.9
1
1.1
1.2
1.3
1.4
Voltage (kV)
1.5
1.6
1.7
1.8
1.9
2
Zonal Efficiency Of RPC
• RPC is placed between two scintillators and
will find the efficiency.
• Our paddles have the area 10cm*10cm.
Paddle 1
RPC
Paddle 2
14 cm
14 cm
5
4
3
2
1
6
5
4
3
2
1
0
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 strips01234
Schematic Diagram
Discriminator 1
2 fold
Paddle1
INO
DAQ
SYSTEM
RPC
Paddle 2
Discriminator 2
Efficiency= (3fold/2fold)*100
PLOT
Acknowledgement
•
•
•
•
•
Dr. B.Satynarayana
Mr.Sumanta Pal
Mr.Ravindra Shinde
Sudheshna Das Gupta
S.S Chavan, Vishal
THANK YOU