The CODALEMA/EXTASIS experiment: a multi-scale and multi-wavelength instrument for radio-detection of extensive air-showers
August 16, 2017
August 03, 2018
Hosted by the Nançay Radio Observatory, the CODALEMA experiment is dedicated to radio detection of cosmic ray induced extensive air showers. It is composed of:
* 57 self-triggering radio detection stations working in the $20-200$ MHz band and spread over 1 km$^2$;
* an array of 13 scintillators as particle detector;
* a compact array made of $10$ cabled antennas, triggered by the particle detector;
* a small array of 5 cabled antennas, and whose role is to figure out the capabilities of a phased antenna cluster to cleverly select air shower events;
* a 3D detector, measuring the electric field in three orthogonal polarizations.
Also supported by CODALEMA is the R&D EXTASIS project, aiming at detecting the low-frequency signal (1-10 MHz) produced at the sudden disappearance of the air shower particles hitting the ground. All these antenna arrays present different density and extent, and can be operated in a joint mode to record simultaneously the radio signal coming from an air shower. Therefore, the Nançay facilities may offer a complete description of the air shower induced electric field at small, medium and large scale, and over an unique and very wide frequency band (from 2 to 200 MHz). We describe the current instrumental set-up and the performances of CODALEMA/EXTASIS.
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