Cosmic Ray Test of INO RPC StackM. Bhuyan1, V.M. Datar2, S.D. Kalmani1, S.M. Lahamge1, N.K. Mondal1,
P. Nagaraj1, S. Pal1, L.V. Reddy, A. Redij1, D. Samuel1, M.N. Saraf1, B. Satyanarayana1, R.R. Shinde1 and P. Verma1
India-based Neutrino Observatory (INO) Collaboration
1Department of High Energy Physics, Tata Institute of Fundamental Research, Mumbai 400005, India
2Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
Plan of my talk
• Introduction to INO RPC system.• Early results.• Construction of 1m X 1m RPCs.• Cosmic ray test stand and the DAQ system.• RPC performance studies using cosmic muons.• Monitoring long term stability of INO RPCs.• Future outlook and summary.
INO RPC system
4
INO Detector – Channel CountNo of modules 3
Module dimension 16 m X 16 m X 12 mDetector dimension 48 m X 16 m X 12 mNo of layers 140Iron plate thickness 6 cmGap for RPC trays 2.5 cmMagnetic field 1.5 TeslaRPC unit dimension 2 m X 2 mReadout strip width 2 cmNo. of RPCs/Road/Layer 8No. of Roads/Layer/Module 8No. of RPC units/Layer 192Total no of RPC units 27000No of Electronic channels 3.6 X 106
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Cosmic Muon Test using small RPCs
Stack of 10 RPCs
Gas unit
Telescope
DAQ
66
Early results
7
RPC building blocks
8
Fabrication of 1m x 1m RPCs
9
INO 1m X 1m RPC Stack
Constructional details of the gas system
10
F ron
t vie
w
Inte
rnal
vie
w
Rear
vie
w
VME BASED DAQ SETUPX strip data
Y strip data
Timing info
DigitalFront End
AnalogFront End
TriggerModule
Event Trigger
Event/Monitor Data
VME CRATE Scaler TDC
Readout Module
Linux based DAQ software (C++, Qt, ROOT)
Interrupt BasedMulti-ThreadedGraphical User Interface
Online 2D/3D Event DisplayRPC Strip MonitoringOnline Error Reporting
RPC Stack
Poster by Deepak Samual for more details about INO DAQ
12
Design and implementation of the data acquisition system
200 boards of 13 types
Custom designed using
FPGA,CPLD,HMC,FIFO,SMD
13
Some interesting cosmic ray tracks
Track Reconstruction
Zenith Angle distribution of cosmic ray tracks c2 distribution of fitted tracks
Study of RPC performance using cosmic rays
Strip Multiplicity due to crossing muons Track residue in mm
Image of a RPC using muons
RPC efficiency
RPC timing study
Poster by S. Pal for more details on timing studies
Particle direction using time information
Velocity ( b ) distribution ( linear) Velocity ( b ) distribution (log)
Average layer-wise time plot for muon tracks in the RPC stack.
Long term monitoring of RPC currents
Monitoring of strip counting rate
Summary
• We have successfully built and operated Glass RPCS in avalanche mode.
• A stack of 12 such RPCs being used continuously to monitor their performances using cosmic muons.
• Currents and noise rates are being monitored over long periods. No degradation after 2.5 years of operation.
• The setup will be used for further studies and as a test stand to test new frontend electronics & DAQ.