88 research outputs found
Radio interferometry applied to the observation of cosmic-ray induced extensive air showers
We developed a radio interferometric technique for the observation of
extensive air showers initiated by cosmic particles. In this proof-of-principle
study we show that properties of extensive air showers can be derived with high
accuracy in a straightforward manner. Direction reconstruction resolution of and resolution on the depth of shower maximum of \,g/cm are
obtained over the full parameter range studied, with even higher accuracy for
inclined incoming directions. In addition, by applying the developed method to
dense arrays of radio antennas, the energy threshold for the radio detection of
extensive air showers can be significantly lowered. The method can be applied
to several operational experiments and offers good prospects for planned cosmic
particle observatories.Comment: 4 pages, 3 figure
RDSim: A fast, accurate and flexible framework for the simulation of the radio emission and detection of downgoing air showers
RDSim is a fast, accurate and flexible framework for the simulation of the
radio emission of downgoing air showers and its detection by an arbitrary
array, including showers initiated by neutrino interactions or tau-lepton
decays. RDSim was build around speed and is based on simple and fast, yet still
accurate, toymodel-like approaches. It models the radio emission using a
superposition emission model that disentangles the Askaryan and geomagnetic
components of the shower radio emission. It uses full ZHAireS simulations as an
input to estimate the electric field at any position on the ground. A single
input simulation can be scaled in energy and rotated in azimuth, taking into
account all relevant effects. This makes it possible to simulate a huge number
of geometries and energies using just a few ZHAireS input simulations. RDSim
takes into account the main characteristics of the detector, such as trigger
setups, thresholds and antenna patterns. To accommodate arrays that use
particle detectors for triggering, such as the Auger RD extension, it also
features a second toymodel to estimate the muon density at ground level and
perform simple particle trigger simulations. Owing to the large statistics made
possible by its speed, it can be used to investigate in detail events with a
very low trigger probability and geometrical effects due to the array layout,
making it specially suited to be used as a fast and accurate aperture
calculator. In case more detailed studies of the radio emission and detector
response are desired, RDSim can also be used to sweep the phase-space for the
efficient creation of dedicated full simulation sets. This is particularly
important in the case of neutrino events, that have extra variables that
greatly impact shower characteristics, such as interaction or decay
depth as well as the type of interaction and it's fluctuations
RDSim, a fast and comprehensive simulation of radio detection of air showers
We present RDSim, a fast and comprehensive framework for the simulation of
the radio emission and detection of downgoing air showers. It can handle any
downgoing shower that can be simulated with ZHAireS including those induced by
CC and NC neutrino interactions and decays. RDSim is based on a
superposition toymodel that disentangles the Askaryan and geomagnetic
components of the shower emission. By using full ZHAireS simulations as input,
it is able to estimate the full radio footprint on the ground. A single input
simulation at a given energy and arrival direction can be scaled in energy and
rotated in azimuth by taking into account all relevant effects. This makes it
possible to simulate a huge number of geometries and energies using just a few
ZHAireS input simulations. The framework takes into account the main
characteristics of the detector, such as trigger setups, thresholds and antenna
patterns. To accommodate arrays that use particle detectors for triggering,
such as the Auger RD extension, it also features a second toymodel to estimate
the muon density at ground level, which is used to perform simple particle
trigger simulations. It's speed makes it possible to investigate in detail
events with a very low trigger probability, as well as many geometrical effects
due to the array layout. In case more detailed studies of the radio detection
are needed, RDSim can also be used to sweep the phase-space for the efficient
creation of dedicated full simulation sets. This is particularly important in
the case of neutrino events, that have extra variables that greatly impact
shower characteristics, such as interaction or decay depth as well as
the type of interaction and it's fluctuations.Comment: arXiv admin note: text overlap with arXiv:2307.0735
Ultra high frequency geomagnetic radiation from extensive air showers
Using the ZHAireS Monte Carlo code, we show that the Fourier-spectrum of the radio emission of inclined airshowers can have a sizable intensity up to the GHz frequency range. At these frequencies only a signi¿cantly reducedvolume of the shower around the axis contributes coherently to the signal observed on the ground, which is mainly due to thegeomagnetic and charge excess mechanisms. At ground level, the maximum emission at high frequencies is concentrated in aring-like elliptical region defined by the intersection with the ground of a Cherenkov cone with its vertex at shower maximum.The frequency-spectrum of inclined showers, when observed at positions close to the ring-like maximum emission region, isin broad agreement with the pulses detected by the ANITA experiment, making the interpretation that they are due to ultra-high energy cosmic ray atmospheric showers consistent with our simulations. These results are also relevant for ground-basedradio experiments aiming at detecting molecular bremsstrahlung radiation in the GHz range - an entirelly different emissionmechanism which is not included in ZHAireS simulations - since they present an important background for such experiments.Fil: Alvarez Muñiz, Jaime. Universidad de Santiago de Compostela; EspañaFil: Carvalho, Washington R., Jr.. Universidad de Santiago de Compostela; EspañaFil: Romero Wolf, Andrés. California Institute of Technology; Estados UnidosFil: Tueros, Matias Jorge. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones CientÃficas. Instituto Argentino de RadioastronomÃa. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Conicet - La Plata. Instituto Argentino de RadioastronomÃa; Argentina. Universidad de Santiago de Compostela; EspañaFil: Zas, Enrique. Universidad de Santiago de Compostela; España5th International Workshop on Acoustic and Radio EeV Neutrino detection ActivitiesErlangenAlemaniaErlangen Centre for Astroparticle Physic
Prospects for High-Elevation Radio Detection of >100 PeV Tau Neutrinos
Tau neutrinos are expected to comprise roughly one third of both the
astrophysical and cosmogenic neutrino flux, but currently the flavor ratio is
poorly constrained and the expected flux at energies above eV is low.
We present a detector concept aimed at measuring the diffuse flux of tau
neutrinos in this energy range via a high-elevation mountaintop detector using
the radio technique. The detector searches for radio signals from upgoing air
showers generated by Earth-skimming tau neutrinos. Signals from several
antennas in a compact array are coherently summed at the trigger level,
permitting not only directional masking of anthropogenic backgrounds, but also
a low trigger threshold. This design takes advantage of both the large viewing
area available at high-elevation sites and the nearly full duty cycle available
to radio instruments. We present trade studies that consider the station
elevation, frequency band, number of antennas in the array, and the trigger
threshold to develop a highly efficient station design. Such a mountaintop
detector can achieve a factor of ten improvement in acceptance over existing
instruments with 100 independent stations. With 1000 stations and three years
of observation, it can achieve a sensitivity to an integrated
flux of GeV cm sr s, in the
range of the expected flux of all-flavor cosmogenic neutrinos assuming a pure
iron cosmic-ray composition.Comment: 26 pages, 11 figure
- …