Abstract
Since 2003, the Nancay Radio Observatory hosts the CODALEMA experiment, dedicated to radio detection of cosmic ray induced extensive air showers. CODALEMA also features the R&D EXTASIS project, aiming at detecting the low- frequency signal ([2-6] MHz) produced at the sudden disappearance of the air shower particles hitting the ground. The 3 current antenna arrays present different antenna den- sity and extent, and can be operated in a joint mode to record simultaneously the radio signal coming from air showers. Therefore, the Nancay 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).
Highlights
Since 2003, the Nançay Radio Observatory hosts the CODALEMA experiment, dedicated to radio detection of cosmic ray induced extensive air showers
We will shortly describe the Nançay experimental site facilities devoted to radio detection of UHECR, and we present some performances recently reached with these multi-scale and multi-frequency facilities
The Nançay radio observatory offers a variety of instruments dedicated to the radio detection of high energy cosmic rays
Summary
Smart triggering algorithms to explore some possible solutions to each of the above problems. The goal of the particle detector (notably described in [3]) is to provide the arrival direction, the size, the core location of the atmospheric shower and an estimation of the energy of the incident cosmic ray It provides a master trigger, which can be broadcasted to any other system throughout the observatory, among others the compact array of antennas and a dedicated station holding the same GPS module as the radio stations described later, for time-stamping. The particle detector array is made of 13 scintillators located on a grid with a variable spacing (approximately 120 m on the diagonal and 170 m on the NS and EW directions) It covers a 340×340 m2 area whose center roughly corresponds to the former cabled radio array center of CODALEMA-2. The particle detector geometry has been designed such that its energy threshold is located at the knee energy, and the array reaches its maximum efficiency for an energy of 1016 eV, with a sensitivity level of 1 particle per m2
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