scholarly journals Broadband RF Phased Array Design with MEEP: Comparisons to Array Theory in Two and Three Dimensions

Electronics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 415
Author(s):  
Jordan C. Hanson
Keyword(s):  
Phased Array ◽  
High Energy ◽  
Index Of Refraction ◽  
Three Dimensions ◽  
Ultra High Energy ◽  
Array Design ◽  
Radar Systems ◽  
Array Detectors ◽  
5 Ghz ◽  
Future Work

Phased array radar systems have a wide variety of applications in engineering and physics research. Phased array design usually requires numerical modeling with expensive commercial computational packages. Using the open-source MIT Electrogmagnetic Equation Propagation (MEEP) package, a set of phased array designs is presented. Specifically, one and two-dimensional arrays of Yagi-Uda and horn antennas were modeled in the bandwidth [0.1–5] GHz, and compared to theoretical expectations in the far-field. Precise matches between MEEP simulation and radiation pattern predictions at different frequencies and beam angles are demonstrated. Given that the computations match the theory, the effect of embedding a phased array within a medium of varying index of refraction is then computed. Understanding the effect of varying index on phased arrays is critical for proposed ultra-high energy neutrino observatories which rely on phased array detectors embedded in natural ice. Future work will develop the phased array concepts with parallel MEEP, in order to increase the detail, complexity, and speed of the computations.

Gamma-rays above 100 GeV

1981 ◽  
Vol 301 (1462) ◽  
pp. 615-628 ◽  
Keyword(s):  
Gamma Rays ◽  
High Energy ◽  
Cherenkov Light ◽  
Ultra High Energy ◽  
Future Work

The Cherenkov light technique for the ground-based detection of ultra-high energy y-rays is described and some of the most significant measurements are reported. Improvements in experiments leading to increases in sensitivity are outlined and the aims of future work are discussed.

scholarly journals Radio Phased Arrays for the Detection of Ultra-High Energy Neutrinos

2019 ◽  
Vol 216 ◽  
pp. 04008
Author(s):  
Eric Oberla
Keyword(s):  
Phased Array ◽  
Austral Summer ◽  
High Energy ◽  
Ultra High Energy ◽  
Dipole Antennas ◽  
Radio Detection ◽  
Trigger Efficiency ◽  
High Energy Neutrinos ◽  
Band Limited ◽  
Ultra High Energy Neutrinos

Ground-based radio arrays offer a promising future for the measurement of ultra-high energy neutrinos, including the prospect of reducing the radio-detection energy threshold to a level necessary to overlap with the high-energy range probed by IceCube (~1016 eV). Here we describe a phased array of antennas and beamforming electronics, which serves as a highly sensitive and directional trigger system for nanosecond-scale plane wave impulses. A prototype in-ice phased array was successfully installed during the 2017/18 austral summer at the South Pole in collaboration with the Askaryan Radio Array (ARA). The trigger array is a compact string of 7 in-ice dipole antennas deployed at a depth of 200 m, whose signals are continuously digitized at the surface using 1.5 GSa/s ADCs with 7-bit resolution. We measure a 50% trigger efficiency on band-limited impulses with signal-to-noise ratios of 2.0 or smaller.

scholarly journals Neutrino Vertex Reconstruction in South Pole Ice

2019 ◽  
Vol 216 ◽  
pp. 02011
Author(s):  
M. Beheler-Amass ◽  
A. Karle ◽  
J.L. Kelley ◽  
M.-Y. Lu
Keyword(s):  
Radio Signal ◽  
High Energy ◽  
Neutrino Energy ◽  
Index Of Refraction ◽  
South Pole ◽  
Ultra High Energy ◽  
Interaction Vertex ◽  
Energy Reconstruction ◽  
Radio Signals ◽  
Vertex Reconstruction

Reconstruction of potential ultra-high-energy (UHE) neutrino events at the Askaryan Radio Array (ARA) is complicated by the variable index of refraction of South Pole ice, leading to curved radio signal paths from the interaction vertex. Using a spline table framework for fast raytracing approximation, we perform a GPU-accelerated interferometric reconstruction of the event vertex. We also demonstrate how use of both direct and reflected/refracted radio signals can allow reconstruction of the distance to the interaction vertex, an important step towards neutrino energy reconstruction.

scholarly journals A Ground-Based Interferometric Phased Array Trigger for Ultra-high Energy Neutrinos

2017 ◽  
Author(s):  
Abigail G. Vieregg ◽  
Patrick Allison ◽  
Keith Bechtol ◽  
Mircea BOGDAN ◽  
Cosmin Deaconu ◽  
...  
Keyword(s):  
Phased Array ◽  
High Energy ◽  
Ultra High Energy ◽  
High Energy Neutrinos ◽  
Ultra High Energy Neutrinos

Unconventional M-MIMO Phased Array Design for 5G Wireless Systems

2019 ◽  
Author(s):  
Nicola Anselmi ◽  
Giorgio Gottardi ◽  
Paolo Rocca ◽  
Giacomo Oliveri ◽  
Andrea Massa
Keyword(s):  
Phased Array ◽  
Wireless Systems ◽  
Array Design

Ultra-high-energy lithium-ion batteries enabled by aligned structured thick electrode design

Rare Metals ◽  
2021 ◽  
Author(s):  
Chao-Chao Zhou ◽  
Zhi Su ◽  
Xin-Lei Gao ◽  
Rui Cao ◽  
Shi-Chun Yang ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
High Energy ◽  
Electrode Design ◽  
Ultra High Energy ◽  
Thick Electrode

scholarly journals Planck Neutrinos as Ultra High Energy Cosmic Rays

2020 ◽  
Vol 29 (1) ◽  
pp. 40-46
Author(s):  
Dmitri L. Khokhlov
Keyword(s):  
Black Holes ◽  
Cosmic Rays ◽  
Standard Model ◽  
Active Galactic Nuclei ◽  
Planck Scale ◽  
Galactic Nuclei ◽  
High Energy ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays ◽  
The Standard Model

AbstractThe studied conjecture is that ultra high energy cosmic rays (UHECRs) are hypothetical Planck neutrinos arising in the decay of the protons falling onto the gravastar. The proton is assumed to decay at the Planck scale into positron and four Planck neutrinos. The supermassive black holes inside active galactic nuclei, while interpreted as gravastars, are considered as UHECR sources. The scattering of the Planck neutrinos by the proton at the Planck scale is considered. The Planck neutrinos contribution to the CR events may explain the CR spectrum from 5 × 1018 eV to 1020 eV. The muon number in the Planck neutrinos-initiated shower is estimated to be larger by a factor of 3/2 in comparison with the standard model that is consistent with the observational data.

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