Transcript GRAPES-3 DAQ Atul Jain on Behalf of GRAPES-3 Collaboration WAPP-2011, (20-29 December ), Bose Institute ,Darjeeling.

GRAPES-3 DAQ
Atul Jain
on Behalf of GRAPES-3 Collaboration
WAPP-2011, (20-29 December ), Bose Institute ,Darjeeling
 Composition of cosmic rays above 30 TeV
 Multi-TeV -ray astronomy
 Effects of solar activity
All of the above science requires the following
High performance detectors
 High speed signal processing
Large data acquisation systems (DAQ)
Commercial equipment is expensive and does not always meet
our exacting requirements. Therefore indigenous development
of detectors and electronics has become a necessity for us
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Data Acquisition System (DAQ)
Detectors @ GRAPES-3
 High performance plastic scintillator detectors
 Large area sealed proportional counters
 Water Cherenkov detectors
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Plastic Scintillator
Detector
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Plastic Scintillator Casting
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 Plastic scintillation detectors - 400
 Spread over an area
- 25,000 m2
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Google Earth View
What we want to know ?
Energy deposited by the particle

Integrate the charge (Pulse from PMT) we
get energy deposited by the particle
Arrival direction of the particle

Measure hit time in each detector with
common reference and by relative
difference calculate arrival direction
Det#1
Disk of Particles
Det#2
Det#1
Det#2
Det#3
Det#3
Det#1
Det#2
Det#1
Det#2
Det#3
Det#3
Det#1
Det#2
Det#1
Det#2
Det#3
Det#3
Gas Mixture 90% Ar +10% CH4
Proportional Counter
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Total
3712
Total Area
560 m2
Absorber
2.4 m
Threshold
E = 1 GeV
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Inside view of Muon Supermodule at GRAPES-3
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GRAPES-3
3712
400
Scintillation
Detector
Monitoring
Muon Detector
ScDet
EAS DAQ
EAS TRIGGER
MUON EAS DAQ
MUONANGLE DAQ
Weather
Data
SCRATE
1 GB
MUDATA
1 GB
SCDATA
8 GB
MUANGLE
4 GB
PRE
ANALYSIS
 Running Monitoring Programs
 Compression of the Raw data
STORAGE
16 GB
DVD Writing
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 A huge volume of data is collected continuously by
the detectors (400 scintillators, 3712- proportinal counters)
 Information in form of signals from all detectors needs to
be processed (signal processing) and recorded (DAQ)

This is a crucial requirement for the successful
running of the experiment.
1 TB information/day
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16 GB data/day
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EAS-DAQ
PROPORTIONAL
COUNTER
PLASTIC SCINTILLATOR
EAS Trigger
Generation
EAS Scint.
DAQ
EAS Muon
DAQ
 Modular
 Easy to maintain, modify, troubleshoot
 Expandable
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EAS Trigger
Requirement :
Uniform response over the trigger area
Each detector should have same priority
Core should be uniformly distributed
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Jain,
CRL-TIFR,
Ooty
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Jain,
CRL-TIFR,
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Reconstructed
EAS
core distribution
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Trigger is generated at two levels
Level-0
Level-1
 Trigger on EAS
 Quality trigger
 100Hz
 30Hz
 Fast (100 ns)
 Slow (1000 ns)
 Initiates Conversion
 Records the data
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Level -0
 Initiates the Conversion
Rate 100Hz.
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Level-1
 Requires a minimum number of detectors to be hit
 Present number of hits is 12
 EAS rate is 30 Hz
 Data from scintillator and muon detectors is recorded
 Implementation done using EPROMs.
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EAS Scintillator DAQ
GRAPES
GRAPES
HV
Dist.
GRAPES
GRAPES
Amplifier
&
Discriminator
GRAPES
ARRAY
OF
DETECTORS
Pulse
Fan-out
400…........721
EAS
Trigger GRAPES
Master
Controller
Level-0
Trigger
GRAPES
Level-1
Trigger
GRAPES
CAEN
GRAPES
GRAPES
GRAPES
Real
Time
Clock
ADC
TDC
CAMAC
Controller
Memory
Buffer
START /
GATE
EAS
Trigger
Clear
Clear
Meinberg
GPS
Receiver
GATE
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START
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EAS Scint DAQ
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Time to Digital Converter (TDC-32)
 32 Channel in Single Module
 520 psec Resolution
 JTAG Programmable Features
 Multiple Modes of operation
 Multiple hit capability
 Low Power Consumption
High Performance Time to Digital Converter (HPTDC)
 32 Channel in Single Module
 24 psec Resolution
 External Clock 40 MHz. ( Internally 80,160,320 MHz)
 Dynamic Range – 51 micro sec
 Double Pulse Resolution 5 nsec
HPTDC CALIBRATION TEST RESULTS
12000
C H0
C A L IB R A T ION OF HP T DC C H0
R E S O L UT IO N O F HP T D C 98ps
D E L AY 25ns
10000
Deviation
from
S traight
L ine(ns )
0.8
y = 10.2397x - 120.8717
2
R = 1.0000
(1/S lope) = res olution
(1/10.2397) = 97.66ps
0.3
6000
-0.2
R MS of D eviation = 31.25ps
4000
-0.7
2000
0
0
200
400
600
D elay in ns
800
1000
-1.2
1200
D eviation in ns
H P T D C C ounts
8000
L inear
(C H0)
8 Ch. Ultra Fast Discriminator
 8 Channel in Single NIM Module
 2.5 nsec Propagation Delay
 Individual Channel Threshold Control
 Individual Channel Out-Width Variable up to 3 microsec
 Double Pulse Resolution 4 nsec
Time Distribution with Muon Trigger
FWHM=4.9ns
8 Ch. Ultra Fast Integrated Amplifier & Discriminator
 8 Channel in Single NIM Module
 2.5 nsec Propagation Delay
 Individual Channel Threshold Control
 Individual Channel Out-Width Variable up to 3 microsec
 TTL and NIM logic out put
EAS Muon DAQ
HV
Dist.
Proportional
Counter
Amplifier
&
Discriminator
RAM
Card
RAM
Control
Card
EAS
Trigger
EAS Data
Process Card
Monitor Data
Process Card
Personal Computer
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EAS Muon DAQ
Muon Angle Recording System (MARS)
 Under normal circumstances the muon detector rate
(proportional counter) has been observed to be nearly
constant with an r.m.s. variation of ~0.1%
 This stability in count rate makes the muon detector a very
sensitive monitor of the solar activity
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Muon Module
 Muon through all 4 layers  4-fold trigger
 Geometry of counters and their separation
allows track reconstruction to 6º
LAYER-3
LAYER-2
LAYER-1
LAYER-0
GROUND
Trigger Logic : 4-Fold
P.C - 1
AMP
DISC
Pulse
Shaper
Layer 3 - OR
P.C 58
Pulse
Shaper
P.C - 1
AMP
DISC
Pulse
Shaper
Layer 2 - OR
P.C 58
Pulse
Shaper
4-FOLD
AND
3200 Hz
P.C - 1
AMP
DISC
Pulse
Shaper
Pulse
Shaper
Layer 1 - OR
P.C 58
P.C - 1
AMP
P.C 58
DISC
Pulse
Shaper
Layer 0 - OR
Pulse
Shaper
MARS
MODULE
CONTROL
CARD
(1)
MODULE
CONTROL
CARD
(0)
4-Fold (1)
4-Fold(2)
4-Fold (0)
4-Fold(3)
MODULE
CONTROL
CARD
(2)
MODULE
CONTROL
CARD
(3)
(3)
PCI CARD
32 BIT
PC
32 Bit
16 Bit
COMMON
CONTROL
CARD
16 Bit
Field of View (225 solid angle bins)
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MARS at GRAPES-3
Monitoring Systems
 Weather Station
 Temperature
 Humidity
 Pressure
 Rain
 Wind Speed
 Wind Direction
 Electric Field Monitoring
 GPS System
Electric Field Monitor
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11/7/20153 Oct 2008
ASET
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Test Benches
 PMT uniformity
 Detector uniformity
 Scintillator hodoscope
 SiPM test facility
 Fast electronics calibration
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Projects for Students
 Muon life-time measurement
 Velocity of light measurement
 Assembly of detectors
 Basic electronics; amplifiers, discriminators, logic units ..
 High frequency signal transmission studies
 Air Shower simulations with CORSIKA
 Detector uniformity
 Paddle Plateauing
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On going R&D Projects
 SiPM Characterization
 SiPM Simulation
 FPGA based Scalar and Trigger with USB interface
 FPGA based DAQ with TCP/IP interface
 High Voltage ( 3000V) and current monitoring for
PMTs
 Temperature Monitor and feed back control for
SiPM
THANKS