Radio Morphing - towards a fast computation of the radio signal from air-showers

ANNE ZILLES; OLIVIER MARTINEAU-HUYNH; KUMIKO KOTERA; MATÍAS TUEROS; KRIJN DE VRIES; W. R. CARVALHO JR.; VALENTIN NIESS

Catania

Workshop; 8th international workshop on Acoustic and Radio EeV Neutrino Detection Activities; 2018

Laboratori Nazionali del Sud in Catania

Abstract. Over the last decades, radio detection of air showers has been established as a promising detection technique for ultrahigh-energy cosmic rays and neutrinos. Very large or dense antenna arrays are necessary to be proficient at collecting information about these particles and understanding their properties accurately. The exploitation of such arrays requires to run massive air-shower simulations to evaluate the radio signal at each antenna position, taking into account features such as the ground topology. In order to reduce computational costs, we have developed a fast computation of the emitted radio signal on the basis of generic shower simulations, called Radio Morphing. Themethod consists in the calculation of the radio signal of any air-shower by i) a scaling of the electric-field amplitude of a reference air shower to the target shower, ii) an isometry on the simulated positions and iii) an interpolation of the radio pulse at the desired position. This technique enables one to gain many orders of magnitude in CPU time compared to a standard computation. In this contribution, we present this novel tool and explain its methodology. In particular, Radio Morphing will be a key element for the simulation chain of the Giant Radio Array for Neutrino Detection (GRAND) project, that aims at detecting ultra-high-energy neutrinos with an array of 200 000 radio antennas in mountainous regions.