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Mohammad Ful Hossain Seikh

Publications and source records attributed to Mohammad Ful Hossain Seikh.

7 recordsLinked to original sources
arXiv2026

AAFIYA: Antenna Analysis in Frequency-domain for Impedance and Yield Assessment

This paper presents AAFIYA (Antenna Analysis in Frequency-domain for Impedance and Yield Assessment), a modular Python toolkit for automated characterization of radio-frequency antennas using measurement and simulation data. The toolkit provides a unified workflow for processing S-parameters, impedance, realized gain, beam patterns, polarization metrics, and calibration-based yield estimation, with support for standard Touchstone files and beam pattern data. AAFIYA is validated using measurements from an electromagnetic anechoic chamber involving Log Periodic Dipole Array (LPDA) reference antennas and Askaryan Radio Array (ARA) Bottom Vertically Polarized antennas over 100-850 MHz. Extracted metrics, including impedance matching, realized gain patterns, vector effective lengths, and cross-polarization ratio, are compared against full-wave simulations from HFSS and WIPL-D, showing good agreement across frequency and angle. The results demonstrate that AAFIYA enables accurate, reproducible, and publication-ready antenna analysis, and provides a flexible foundation for future extensions, including automated optimization and data-driven antenna design.

physics.ins-det↗
arXiv2025

Development of a Custom kV-amplitude, pressure-tolerant Radio-Frequency transmitter

Current experiments seeking first-ever observation of Ultra-High Energy Neutrinos (UHEN) typically utilize radio frequency (RF) receiver antennas deployed in cold, radio-transparent polar ice, to measure the coherent RF signals resulting from neutrino interactions with ice molecules. Accurate calibration of the receiver response, sampling the full range of possible neutrino geometries, is necessary to estimate the energy and incoming direction of the incident neutrino. Herein, we detail the design and performance of a custom radio-frequency calibration transmitter, consisting of a battery-powered, kiloVolt-scale signal generator (`IDL' pulser) driving an antenna (South Pole UNiversity of Kansas antenna, or `SPUNK') capable of operating at pressures of 200 atmospheres. Performance was validated by lowering the transmitter into a borehole at the South Pole to a depth of 1740 m, yielding high Signal-to-Noise ratio signals at a distance of 5 km from the source.

astro-ph.IM↗
arXiv2025

A geometrical approach to neutrino oscillation parameters

We propose a geometric hypothesis for neutrino mixing: twice the sum of the three mixing angles equals $180^\circ$, forming a Euclidean triangle. This condition leads to a predictive relation among the mixing angles and, through trigonometric constraints, enables reconstruction of the mass-squared splittings. The hypothesis offers a phenomenological resolution to the $θ_{23}$ octant ambiguity, reproduces the known mass hierarchy patterns, and suggests a normalized geometric structure underlying the PMNS mixing. We show that while an order-of-magnitude scale mismatch remains (the absolute splittings are underestimated by $\sim 10\times$), the triangle reproduces mixing ratios with notable accuracy, hinting at deeper structural or symmetry-based origins. We emphasize that the triangle relation is advanced as an empirical, phenomenological organizing principle rather than a result derived from a specific underlying symmetry or dynamics. It is testable and falsifiable: current global-fit values already lie close to satisfying the condition, and improved precision will confirm or refute it. We also outline and implement a simple $χ^2$ consistency check against global-fit inputs to quantify agreement within present uncertainties.

hep-ph↗
arXiv2025

Techniques for Continuous Wave Identification and Filtering in the Askaryan Radio Array

The Askaryan Radio Array (ARA), located near the South Pole, is among the first experiments there designed to detect ultra-high energy neutrinos through the Askaryan effect. When such neutrinos interact in dense media like ice, they initiate particle cascades that generate coherent radio pulses. Operating in the 150-850 MHz band, ARA is deployed 80-200 meters deep in Antarctic ice, where the radio background is exceptionally low. Despite this, experiments such as ARA must still account for continuous wave (CW) signals, which can originate from anthropogenic sources, instrumental noise, and other environmental factors. These CW signals can obscure faint neutrino-induced pulses, complicating data analysis and event identification. Over the years, ARA has developed and refined techniques for CW filtering and identification, including spectral analysis, notch filtering, and phase-variance methods. These approaches exploit CW characteristics such as their narrowband nature and persistence to separate contamination from genuine impulsive events. We review the main CW identification and filtering techniques developed within the ARA collaboration and present recent improvements in adaptive, multi-stage filtering pipelines. These advances have led to faster processing, simpler operation, and more accurate CW suppression, improving data analysis quality. Their efficacy is demonstrated across all ARA stations, underscoring their role in reducing event misclassification and enhancing performance. By refining these techniques, this work not only improves the sensitivity of ARA but also highlights the importance of robust CW filtering for current and future neutrino radio detection experiments.

astro-ph.IM↗
arXiv2025

Physics of radio antennas

Radio antennas are widely used in the field of particle astrophysics in searches for ultra-high energy cosmic rays (UHECR) and neutrinos (UHEN). It is therefore necessary to properly describe the physics of their response. In this article, we summarize the mathematics underlying parameterizations of radio antennas. As a paradigm, we focus on a half-wave dipole and also discuss measurements of characteristics, performed in an electromagnetic (EM) anechoic chamber.

astro-ph.IM↗
arXiv2024

Askaryan Radio Array: searching for the highest energy neutrinos

Searches for ultra-high energy ($E_ν\geq 10$ PeV) cosmogenic and astrophysical neutrinos (UHENs) have been conducted by several experiments over the last two decades. The Askaryan Radio Array (ARA), located near the geographical South Pole, was one of the first two experiments that used radio antennas sensitive to orthogonal polarizations for detection of neutrino-induced Askaryan radiation. ARA comprises five independent autonomous stations, with an additional low threshold phased array merged with station 5, which were deployed at a depth of 100-200 m over the period 2012-2018, corresponding to a total livetime of more than 27 station years. In this article, we present a brief overview of the detector, its detection technique, and discuss a few of its major achievements with a focus on the current status of the array-wide UHEN search. We expect to produce the most sensitive results on the neutrino flux by any existing in-ice neutrino experiment below 1000 EeV energy.

astro-ph.HE↗