Status report for TREND GRANDproto Olivier Martineau FCPPL

Status report for TREND & GRANDproto Olivier Martineau FCPPL workshop, Strasbourg, March 31 st the 21 CM array (G

TREND-50 (2011 -2014) • Goal: autonomous radio detection of air showers • Site: Ulastai, Xin. Jiang province, China (site of the 21 CMA radio-interferometer) • 50 monopolar antennas deployed over 1. 5 km² • DAQ allowing ~200 Hz trigger/antenna TREND: 465 EAS candidates selected in 317 live days from offline analysis of radio data (2014). Distribution as expected for EAS (2015) TREND goal reached: autonomous EAS detection & identification with radio antennas is possible. 60° 30° Data Simu (no envir cuts + only West hemisphere) O. Martineau, LPNHE, FCPPL 2016 workshop, Strasbourg Zenithal distribution d. N/dq (Normalized) 90° d. N/dj (Normalized) Azimuthal distribution Data Simu EAS (full array)

TREND status • Issues with simulations explain discrepencies @ large zenith angles. EVA Efield simulation E = 1017 e. V q = 78° • Next (& final) goal: compute TREND detection response to simulated EAS as a function of time taking into account true array status. => determine detection efficiency & background contamination. • Issue: amplitude calibration made difficult by gain fluctuations. New EVA version 50 -100 MHz noise level (d. B) Old EVA version O. Martineau, LPNHE, FCPPL 2016 workshop, Strasbourg

GRANDproto • Context: autonomous radio-detection of EAS with limited efficiency only: ~%s for AUGER-AERA, ~10%s for TREND (tbc, see before). • Likely causes: ▫ Large background rate kills DAQ live time (AUGER (+ TREND) ▫ Air showers selection cuts strongly affect detection efficiency (TREND) • GRANDproto: dedicated set-up for air shower autonomous radiodetection with high-efficiency + high -purity O. Martineau, LPNHE, FCPPL 2016 workshop, Strasbourg

GRANDproto radio array • 3 D antennas (SUBATECH design, Xi’An prod) ▫ Reconstruction of full polarization info signature for EAS/background rejection (e? ) E┴v E┴B E O. Martineau, LPNHE, FCPPL 2016 workshop, Strasbourg

GRANDproto radio array DAQ system (LPNHE design & proto, French company prod) ▫ Trigger on 30 -100 MHz analog signal ▫ Enveloppe detection ▫ Front end digitization ▫ GPS timing ▫ 100% duty cycle up to ~5 k. Hz Simulated signal at filter output Simulated signal at power detector output O. Martineau, LPNHE, FCPPL 2016 workshop, Strasbourg Simulated signal at ADC output (60 MS/s)

GRANDproto ground array • Array of 24 scintillators on the radio array site, running independently. • Layout designed for optimal detection efficiency for showers coming from North & 30<q<70° • To be used as an EAS-pure detector for offline cross-check allowing quantitative determination of radio detection efficiency and background rejection performances. • Goal: establish radio-detection as a valid tool for autonomous detection of EAS (i. e. detection efficiency + background rejection) O. Martineau, LPNHE, FCPPL 2016 workshop, Strasbourg Antennas Scintillators

GRANDproto status • 6 antennas + 6 scintillators deployed summer 2015 for tests • Analog card succesfully tested on site (summer 2015) • DAQ card presently tested in LPNHE. On-site test in April 2016. Production this summer, full deployment before end 2016. • Sandra Le Coz (Auger Ph. D) in NAOC for 2 years since October (CAS fellowship). Zenith distrib Azim distrib Vz Vy Vx O. Martineau, LPNHE, FCPPL 2016 workshop, Strasbourg