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DAQ System to Search for GRBs using Water Cerenkov Detectors. Mario Castillo*, Gonzalo Perez*, Humberto Salazar* and L. Villaseñor ** * Facultad de Ciencias FisicoMatematicas, BUAP, Puebla  ** Institute of Physics and Mathematics, University of Michoacan, Morelia. VII SILAFAE CAB

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slide1

DAQ System to Search for GRBs using Water Cerenkov Detectors

Mario Castillo*, Gonzalo Perez*, Humberto Salazar* and L. Villaseñor **

* Facultad de Ciencias FisicoMatematicas, BUAP, Puebla 

** Institute of Physics and Mathematics, University of Michoacan, Morelia

VII SILAFAE

CAB

Bariloche, Ar

January, 13-21, 2009

slide5

4m2 x 1.4 m

Single 5” EMI flat PMT

Tyvek

Ultra pure (~20 microS)‏

water

slide6

Schematic of the

DAQ Board

(one channel upgradable to 3 channels)‏

Languages: VHDL + Perl & AWK

50 Mhz

Clock

JTAG

PROM

FPGA

Xilinx Spartan 2E

Antenna

RS232

115200

Baud

4 operation modes:

Trace, Charge, Rate,

Muon Decay

1 PPS

VP or UT

Oncore

GPS Receiver

50 ns

2x-4x

clock

Serial

9600

Baud

RAM

10 bit ADC board

100-200 MHz||

Signal

from PMT

slide7

ADC daugther boards

1 or 2 AD9214BRSZ-105

chips operating at

100MSPS.

slide8

We use one (two) delay-locked

loop (DLL) circuits to obtain

100 (200) Mhz out of 50 MHz

slide9

Use a Motorola Oncore GPS receiver

in precise Timing Mode model UT+

Position-Hold option

1PPS Cable and antenna Delay

Time RAIM option to isolate satellites with erroneous time measurements

slide11

Trace mode, samples 30 trace points every 10 ns in

real time and measures charge, amplitude, baseline and STD

slide12

Trace Mode: Up to 180 full traces per second

Bottle-

neck:

115200

baud

comm

rate

slide13

Charge mode: Up to 2880 Charge & Amplitude

measurements per second (1920 per s if rise time is

also measured)‏

slide14

Measure Charge, Amplitude,T10-50,T10-90

with good precision for three different triggers.

Arbitrary muons threshold of 30mV

slide15

1.54 m diameter, 1.2 m water,

one 8” PMT, tyvek

1/5 in volume of an Auger WCD

slide19

Rise time behaves

similarly to

Charge over

amplitude

slide20

Charge spectrum

2000 masl

4550 masl

slide21

Muon decay mode: Time between consecutive pulses

in a 20 microsec window and time over threshold

with granularity of 5 ns

slide22

Stopping muon

at 0.1 VEM

Decay electron

at 0.17 VEM

Crossing muon

at 1.05 VEM

Alarcón

M. et al.,

NIM A 420

[1-2], 39-47

(1999).

conclusions
Conclusions

DAQ system prototype tested

1-3 ADC channels at 100-200 MHz

Precise timing from GPS

4 operation modes: Trace, charge, muon decay and rate

To do: implement as a single board