Centro Brasileiro de Pesquisas Fsicas CBPF Presented by
Centro Brasileiro de Pesquisas Físicas (CBPF) Presented by A. F. Barbosa, in the V AAP Workshop, March 2009
Abstract • important milestone for the Angra Neutrinos Project; • first “visible” sign of the anti-neutrinos detector implementation; • impact on the detector concept: very close to the reactor core + at sea level; • goals: measuring background, testing hardware + data acquisition + connection etc.
Detector concept Relativistic charged particle crossing a dielectric medium radiation emission In water: max = 41 o min = 0. 75 3
Detector concept Taking: 2 - 1 = , 1 = 1 nm, covering the visible light spectrum 4
Detector design 1 – Water 2 – Tank 3 – Tyvek ‘bag’ 4 – ‘bag’ holder 5 – Tyvek top cover 6 – Black rubber sealing 7 – Tank hat 8 – Pmt + base 9 – High voltage 10 – Signal output 1. 28 m height, 0. 8 m diameter 640 liters 5
Electronics (analog modules) Pre-amplifier & shaping (*) Angra. Note 001 -2007 Discriminator + reate meter Temperature sensor The three circuits have been assembled in one single NIM module 6
Electronics (digital module) • 4 ADC channels • 8 TDC channels (not used here) • Programmed hardware USB 7
Data Acquisition Data block for an event • Waveforms sampled @ 60 MHz sampling rate (16. 6 ns time bin) • 128 samples per event (32 before trigger, 96 after trigger) • Code compiled under Linux in ROOT
Characterization results (pre-amplifier) Line: SPICE simulation Dots: measurements in scope 9
Characterization results (rate meter) (*) The expected counting muon count rate is below 3 KHz
Characterization results (temperature sensor) The error bars in the Y-axis are multiplied by 10. Only a rough precision room temperature monitoring is required 11
Characterization results (Data Processing Module) Error bars multiplied by 10. 12
Acknowledgement • The Angra Neutrino project is currently financed by grants from: CNPq, FINEP, MCT, FAPERJ, CAPES • Unvaluable support from ELETRONUCLEAR (especially A. C. Mazzaro, I. Soares, L. Domingues de Souza, A. M. Santos Filho) • Help from undergraduate students: T. Blanche, L. Amaral 13
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