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CODALEMA A Cosmic Ray Radio Detection Array

CODALEMA A Cosmic Ray Radio Detection Array. Didier Lebrun , LPSC Grenoble & CODALEMA Collaboration. CODALEMA. Collaboration ~ 25 persons from 8 French Labs Particle & Cosmic Ray Physics SUBATECH, Nantes LAL, Orsay LPSC, Grenoble Radio Astronomy LESIA, Observatoire de Paris

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CODALEMA A Cosmic Ray Radio Detection Array

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  1. CODALEMA A Cosmic Ray Radio Detection Array Didier Lebrun , LPSC Grenoble & CODALEMA Collaboration

  2. CODALEMA Collaboration ~25 persons from 8 French Labs Particle & Cosmic Ray Physics SUBATECH, Nantes LAL, Orsay LPSC, Grenoble Radio Astronomy LESIA, Observatoire de Paris USN, Nançay LAOB, Besançon Atmospheric Physics LPCE, Orleans Electronics ESEO, Angers • Project • Observation of Transient Events • with Digital Radio astronomy • Stellar • Solar & Planetary (icrc0337) • Atmosphere • Cosmic Ray Radio Detection • Telescope deployment (icrc0161) • Study of Radio emission (icrc0460) • Large Array R&D (icrc0339) Didier Lebrun, LPSC Grenoble

  3. EAS Radio Detection • 40 years after first successfull experiment in Jodrell Bank • EAS Radio Detection revisited since 2004 from • LOPES in Karlsruhe • CODALEMA in Nançay • New Phase: Characterization of EAS Radio emission • CODALEMA : 3 years funded ANR program since 2006 • To Develop and Deploy for cosmic ray studies: • Ground Particle Detector Array • to trig and calibrate radio signal • New Radio Antenna Array • from huge log antennas to small linear antennas COsmic ray Detection Array with Logarithmic Electro-Magnetic Antennas Linear Didier Lebrun, LPSC Grenoble

  4. Radio Astronomy Observatory in Nançay Decametric Network Large Radio Telescope Heliograph station CODALEMA Didier Lebrun, LPSC Grenoble

  5. Array Lay Out Didier Lebrun, LPSC Grenoble

  6. DAQ All detectors Wired to Central DAQ 16 Antennas T 14 EW+1 Cross “MATACQ” Digitalizing Cards 1 Gs/s 12bits , 2560 points. 1V max 13 Scintillators Clock HG TRIGGER 2 PMTs High Gain and Low Gain per station Gate 600 ns Didier Lebrun, LPSC Grenoble

  7. Scintillator Array : Data processing • Signal analysis • Calibration with VEM • Arrival Direction: TOF/stations • Arrival time: Plane shower front • Shower Size : • Integrated pulse/station /VEM • LDF fit with NKG function • Shower Core: Internal ( /external) • Trigger select:Central counter>surroundings) qdistribution Didier Lebrun, LPSC Grenoble

  8. ScintillatorArray :EAS Energy Estimation Use of Constant Intensity Cut CIC Method secq bins Intensity counts N(q) ‘Vertical Equivalent Shower Size’ From simulations (AIRES) : E= 2.14 1010 N00.9 dE/E = 32% @ 1017 eV log E (eV) Scintillator Array Energy Spectrum Internal Events Didier Lebrun, LPSC Grenoble

  9. Radio Array : Active Dipole Antennas Short Dipole L< l - ~Isotropic(n <nRes) - Smooth n response Effective Length Voc = L .E Active Low induced current - Needs amplifier Z Pure capacitive -Matching Load 50 MHz Gain (q,f) HPBW=60° Eff. Length (dB meter) at Zenith Low Noise Amplifier ASIC BiCMOS 0,8m High Input Impedance BW(3dB)=200MHz GLNA=34 dB Input Noise: 1.3 nV/VHz Z input = 10 pF Transmission S~1 (<100 MHz) L=1.2 m h=1.0 m nres ~ 115 MHz MHz L= L . S . GLNA Didier Lebrun, LPSC Grenoble

  10. Calibration: Interferometric measurementwith sky source Correlation Dipole- Decametric Array during Cas A Transit See ICRC339 Poster, B.Revenu Didier Lebrun, LPSC Grenoble

  11. Radio Frequency Background on Site FM LNA Noise Expected Sky Noise With Dipole L Analyzer noise Filter BW Didier Lebrun, LPSC Grenoble

  12. Tagging AntennasDigital Filtering in 23-85 MHz Band Scintillator Array Trigger Event q=43° f=39° Labelled ‘external’ logE~18.3 Associated Radio event q=39.5° f=32° Scint/Radio wave front D y = 6.5° D t = 7.5 ns Didier Lebrun, LPSC Grenoble

  13. EAS Radio Event Validation Particle and Radio Shower Front Coincidence Didier Lebrun, LPSC Grenoble

  14. Signal in Filtered bandand Spectrum in Full band • Signal amplitude analysis in filtered band [23-85] • Spectral dependence information in Full band • (analysisin progress) Raw EAS Event milli-Volts Log (Power/MHz) arb.units Random Trigger 0 Frequency 200 MHz -500 0 500 nanoseconds Didier Lebrun, LPSC Grenoble

  15. Conclusions CODALEMA A Radio Detection Array with Active Dipole Antennas, Coupled with a Scintillation Counter Array was described. CODALEMA is now running in Nançay to study EAS radio emission at energy E~1017 eV Results will be presented in icrc0420 CODALEMA further developments include More antennas in NS for Polarization studies (on going this year) Increase ground array size (on going this year) New semi-autonomous antennas (2008, embedded DAQ, not self-powered) Self-triggering radio system Solitary Antenna system R&D for very large arrays Didier Lebrun, LPSC Grenoble

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