GRAPES-3 DAQ

Atul Jainon Behalf of GRAPES-3 Collaboration

WAPP-2011, (20-29 December ), Bose Institute ,Darjeeling

2WAPP-2011 Atul Jain, CRL-TIFR, Ooty

TRANSDUCER

AMPLIFIE

R

DISCRIM

INATOR

SIGNAL

PROCESSING

DATA

RECORDIN

G

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 Det#2 Det#3

Det#1

Det#2

Det#3

Disk of Particles

Det#1 Det#2 Det#3

Det#1

Det#2

Det#3

Disk of Particles

Det#1 Det#2 Det#3

Det#1

Det#2

Det#3

Disk of Particles

Gas Mixture 90% Ar +10% CH4

Total 3712

Total Area 560 m2

Absorber 2.4 m

Threshold E = 1 GeV

Proportional Counter

12WAPP-2011 Atul Jain, CRL-TIFR, Ooty

Inside view of Muon Supermodule at GRAPES-3

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15

Muon Detector

EAS DAQ

GRAPES-3

SCRATE1 GB

Monitoring

SCDATA8 GB

MUONANGLE DAQMUON EAS DAQ

MUDATA1 GB

MUANGLE4 GB

PRE ANALYSIS

STORAGE16 GB

3712 400

Running Monitoring Programs Compression of the Raw data

DVD Writing

EAS TRIGGER

Weather Data

ScDetScintillation Detector

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 16 GB data/day

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EAS-DAQ

Modular Easy to maintain, modify, troubleshoot Expandable

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EAS Trigger

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Requirement :Uniform response over the trigger area

Each detector should have same priority Core should be uniformly distributed

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Reconstructed EAS

core distribution

Trigger is generated at two levels

Level-0 Level-1Trigger on EAS

100Hz

Fast (100 ns)

Initiates Conversion

Quality trigger

30Hz

Slow (1000 ns)

Records the dataWAPP-2011 Atul Jain, CRL-TIFR, Ooty 20

Level -0

Initiates the Conversion

Rate 100Hz.

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Level-1Requires 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.

22WAPP-2011 Atul Jain, CRL-TIFR, Ooty

TDC

ARRAY OF

DETECTORS

HVDist.

PulseFan-out

Amplifier&

Discriminator

Level-0Trigger

Level-1Trigger

RealTimeClock

ADC

GRAPES

MasterController

CAMACController

MemoryBuffer

START / GATE

EAS Trigger

Clear

EAS Trigger

GATE

Clear

START

400…........721

EAS Scintillator DAQ

GRAPES GRAPES GRAPESGRAPESCAEN

GRAPESGRAPES

GRAPESGRAPES

GRAPES

GRAPES

GPSReceiver

Meinberg

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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 RESULTSC AL IB R AT ION OF HP T DC C H0

R E S O L UT IO N OF HP T DC 98ps DE L AY 25ns

y = 10.2397x - 120.8717R 2 = 1.0000

0

2000

4000

6000

8000

10000

12000

0 200 400 600 800 1000 1200

D elay in ns

HP

TD

C C

ou

nts

-1.2

-0.7

-0.2

0.3

0.8

Dev

iatio

n in

ns

C H0

DeviationfromS traightL ine(ns )

L inear(C H0)

(1/S lope) = res olution(1/10.2397) = 97.66ps

R MS of D eviation = 31.25ps

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

FWHM=4.9ns

Time Distribution with Muon Trigger

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

Proportional Counter

Amplifier&

Discriminator

RAM Card

RAMControl

Card

EAS DataProcess Card

Monitor DataProcess Card

EAS Trigger

Personal Computer

HVDist.

31WAPP-2011 Atul Jain, CRL-TIFR, Ooty

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

33WAPP-2011 Atul Jain, CRL-TIFR, Ooty

Muon Module

Muon through all 4 layers 4-fold trigger

Geometry of counters and their separation allows track reconstruction to 6º

LAYER-0

LAYER-1

LAYER-2

LAYER-3

GROUND LEVEL

4-FOLD

P.C - 1

AMP DISC

P.C 58 Layer 3 - OR

Pulse Shaper

P.C - 1

AMP DISC

P.C 58 Layer 2 - OR

Pulse Shaper

P.C - 1

AMP DISC

P.C 58 Layer 1 - OR

Pulse Shaper

P.C - 1

AMP DISC

P.C 58

AND3200 Hz

Layer 0 - OR

Pulse Shaper

Pulse Shaper

Pulse Shaper

Pulse Shaper

Pulse Shaper

MODULE

CONTROLCARD

(2)

MODULECONTROL

CARD(3)

(3)

MODULECONTROL

CARD(1)

MODULECONTROL

CARD (0)

COMMONCONTROL

CARD

PCI CARD 32 BIT

16 Bit 16 Bit

32 Bit

4-Fold (1)

4-Fold (0) 4-Fold(3)

PC

4-Fold(2)

Field of View (225 solid angle bins)

37WAPP-2011 Atul Jain, CRL-TIFR, Ooty

MARS at GRAPES-3

Monitoring SystemsWeather Station

TemperatureHumidityPressureRainWind SpeedWind Direction

Electric Field Monitoring

GPS System

40

Electric Field Monitor

04/22/233 Oct 2008 ASET Atul Jain, CRL-TIFR, Ooty 41

Test Benches PMT uniformity

Detector uniformity

Scintillator hodoscope

SiPM test facility

Fast electronics calibration

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Projects for StudentsMuon life-time measurementVelocity of light measurementAssembly of detectorsBasic electronics; amplifiers, discriminators, logic

units ..High frequency signal transmission studiesAir Shower simulations with CORSIKADetector uniformityPaddle Plateauing

43WAPP-2011 Atul Jain, CRL-TIFR, Ooty

On going R&D ProjectsSiPM CharacterizationSiPM SimulationFPGA based Scalar and Trigger with USB

interfaceFPGA based DAQ with TCP/IP interfaceHigh Voltage ( 3000V) and current

monitoring for PMTsTemperature Monitor and feed back control

for SiPM

THANKS