UNIFORMITY STUDY OF INO ICALS 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 Voltage (kV) EfficiencyEfficiency

Efficiency v/s voltage graph of test paddle 2 Voltage (kV) EfficiencyEfficiency

Zonal Efficiency Of RPC RPC is placed between two scintillators and will find the efficiency. Our paddles have the area 10cm*10cm. 14 cm Paddle 1 Paddle 2 RPC

As shown in the figure above, in order to calculate the efficiency, we consider the hits in x strips and y strips

Schematic Diagram Discriminator 1 Paddle1 Paddle 2 RPC Discriminator 2 2 fold INO DAQ SYSTEM Efficiency= (3fold/2fold)*100

PLOT

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

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