Electronica para los detectores Cherenkov de LAGO Rubén Conde*, Humberto Salazar* and L. Villaseñor ** * Facultad de Ciencias FisicoMatematicas, BUAP, Puebla ** Institute of Physics and Mathematics, University of Michoacan, Morelia Reunión de Trabajo LAGO La Paz Diciembre 13-15, 2010

Search for GRBs over the last 5 years using pulse counting at different thresholds (See Jacinta's talk) Forbush detection over the Last 5 years at SN and Chacaltaya and last Year in Morelia

Laboratatorio de Física Cósmica Chacaltaya  Bolivia, the oldest high mountain laboratory.

9/11/10 Marcapomacocha-Perú

9/11/10 Pico Espejo Merida Venezuela

FPGA Xilinx Spartan 3E 500K or 1.2M Gates JTAG 50 Mhz Clock GPS Receiver 50 ns Atm Press. 2xTemp. Antenna 1 PPS Serial 9600 Baud PROM 4 operation modes: Trace, Charge Calib, Rate, Muon Decay RAM 10 bit ADC board MHz| Schematic of the DAQ Board (3, 4 channels) Languages: VHDL Perl, C++, Python, AWK RS Baud 2x-4x clock Signal from PMT USB >10M B/s See Ruben Conde's Talk for 4 ADCs

We use a Motorola Oncore GPS receiver We use a Motorola Oncore GPS receiver in precise Timing Mode model UT+ Position-Hold option 1 PPS TTL pulse 1 PPS Cable and antenna Delay Time RAIM (time receiver autonomous integrity monitoring) option to isolate satellites with erroneous measurements

For 100 MS/s we do Charge calibration at ~50 KHz Full traces at ~5 Khz HAWC PMT signals at 200 MS/s

Charge spectrum Charge integration Inside the FPGA ~50 KHz 2000 masl 4550 masl

Trace mode, samples 30 trace points every 10 ns in real time and measures charge, amplitude, baseline and STD

Muon decay mode: Time between consecutive pulses in a 20 microsec window and time over threshold with granularity of 5 ns

Electronics One reason Why We prefered Our custom FPGA-based Electronics Baseline Changed Rate did not Change Because our Thresholds Are anchored To the baseline Inside the FPGA We use VHDL to Program the FPGAs

Raw Data Poisson errors Sqrt(358)=18.9 Sigma=19

Data analysis: Anticorrelation Between R and P Data from October, 2009

Data Analysis

Data analysis: Anticorrelation Between R and P for Chacaltaya Data from January, 2010

Data Analysis Anticorrelation Between R and P for Chacaltaya

(Integrated Count-Mean)/Sigma For different time scales to look for long and short GRBs Plot created with the command LAGO Plot CHA

(Integrated Count-Mean)/Sigma For different time scales to look for long and short GRBs Plot created with the command LAGO Plot CHA

Conclusions ● 3 and 4 ADC channels at 100 MS/s ● Precise timing from GPS, Low power, ● Can be used with SBC or Laptop ● 4 operation modes: Trace, charge (calibration), muon decay and rate. It is fast (~50 KHz) for single PMT calibration ● Serial Port for atmospheric pressure and 2 temp. sensors ● USB port for rate and calibration ● These electronics board have been tested over the last years in Sierra Negra, BUAP and Morelia ● Good for GRB and Forbush physics, single tank tests, etc.. ● We can tailor the firmware to fit our applications in LAGO