WorldCat Identities

Beatty, James J.

Overview
Works: 8 works in 8 publications in 1 language and 64 library holdings
Genres: Programmed instructional materials  Academic theses 
Roles: Author
Classifications: QD31.2.B398, 540.76
Publication Timeline
.
Most widely held works by James J Beatty
The elements of style in chemistry : a computer assisted instruction supported text by James Wayne Beatty( Book )

1 edition published in 1981 in English and held by 56 WorldCat member libraries worldwide

Investigating the performance of the interferometric trigger for future flights of the Antarctic Impulsive Transient Antenna by Ryan Craig Hupe( )

1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide

One of the primary unanswered questions in the field of astrophysics is the source of high-energy cosmic rays. Decades of searching by many different experiments have not identified any point sources. Cosmogenic neutrinos are an ideal candidate for source identification due to their ability to reach Earth unattenuated and undeflected. The Antarctic Impulsive Transient Antenna (ANITA) experiment is a high-altitude radio-antenna balloon designed to detect ultra-high-energy cosmogenic neutrinos via Askaryan emission in the Antarctic ice shelf. A redesign of the ANITA event trigger, called the Triggering Interferometric Sum Correlator (TISC), was performance tested and compared to simulations of the trigger. In order to characterize the performance of the TISC, a testbench was developed to generate impulsive signals and thermal noise that closely matched observations from previous ANITA flights. During this testing process, numerous unexpected issues were found including differential non-linearity of some digital-to-analog converters, errant digitization values due to poor signal encoding, and integral non-linearity within analog-to-digital converters resulting from integrated circuit variation during manufacturing. These issues, as well as others, were characterized and novel calibration strategies were developed to minimize their effect on the triggering performance. Threshold scans were performed at various impulsive signal amplitudes. Data from these threshold scans were used to develop efficiency curves that showed a factor of 1.38 increase in neutrino sensitivity compared to previous triggering systems. This increase in efficiency will allow a future ANITA flight to set stronger cosmogenic neutrino limits and increase ANITA's sensitivity neutrino interactions within the Antarctic ice shelf
The isotopes of hydrogen and helium in the galactic cosmic radiation : their source abundances and interstellar propagation by James J Beatty( )

1 edition published in 1986 in English and held by 1 WorldCat member library worldwide

Microwave detection of cosmic rays and multi-messenger analysis of the parameters of ultra-high energy astrophysical sources by Nathan E Griffith( )

1 edition published in 2015 in English and held by 1 WorldCat member library worldwide

The study of ultra-high energy (UHE) cosmic particles is frequently characterized by its low statistics, and a central problem of the field is to find novel ways to navigate this challenge. The research presented in this dissertation attempts to address this problem in two ways: first, by investigating microwave radiation as a new method of UHE cosmic ray detection, and second, by using a multi-messenger (proton and neutrino) analysis to determine what current and next generation UHE neutrino detectors may be able to reveal about UHE astrophysical sources. The cosmic ray detector (called AMBER) is primarily a joint collaboration between Ohio State and the University of Hawaii. In May/June 2011 the AMBER experiment was installed at the Pierre Auger Observatory in Malargue, Argentina, and began taking data in coincidence with the observatory's surface detector array. This work presents a description of the experiment, a calibration based on an astrophysical radio source (the Milky Way galaxy), and an analysis of data. The second half of this document describes a multi-messenger analysis performed with co-authors Amy Connolly and Shunsaku Horiuchi on a publication in preparation. Fits to Pierre Auger 2013 data are used in conjunction with a spectral model and simulations of UHE neutrino detectors to explore the UHE source parameters of cosmic evolution and source spectrum cutoff. Constraints provided using the effective areas of the ANITA 3, ARA, and EVA detectors are considered
Ultra-high energy cosmic rays : composition, early air shower interactions, and Xmax skewness by James Stapleton( )

1 edition published in 2015 in English and held by 1 WorldCat member library worldwide

The composition of Ultra-High Energy Cosmic Rays (UHECRs) is still not completely understood, and must be inferred from Extended Air Shower (EAS), particle cascades which they initiate upon entering the atmosphere. The atmospheric depth at which the shower contains the maximum number of particles (Xmax) is the most composition-sensitive property of the air shower, but its interpretation is hindered by intrinsic statistical fluctuations in EAS development (which cause distinct compositions to produce overlapping Xmax distributions) as well as our limited knowledge at these energies of hadronic physics (which strongly impacts the Xmax distribution's shape). These issues ultimately necessitate a variety of complementary approaches to interpreting UHECR composition from Xmax data
A search for ultra-high energy cosmic neutrinos : data analysis of the Antarctic impulsive transient antenna, third flight by Sam Stafford( )

1 edition published in 2017 in English and held by 1 WorldCat member library worldwide

Ultra-high Energy (UHE) neutrinos represent an increasingly important messenger in astronomy and astrophysics. The Antarctic Impulsive Transient Antenna (ANITA) experiment campaign utilizes a balloon-borne phased antenna array to detect coherent Cherenkov radio-frequency pulses induced by UHE neutrinos interacting with the Antarctic ice. We analyzed the data from the third ANITA flight (ANITA-III) for evidence of Ultra-high energy neutrinos by augmenting interferometric methods used in analyses of previous ANITA flights. Continuous wave (CW) radio content from ground-based Antarctic habitations and orbiting geostationary communications satellites interferes with the detection and analysis of neutrino-induced radio signals; we developed circular polarization analysis methods to facilitate improved rejection of false positives induced by satellite CW. We also developed new methods of calculating signal-to-noise ratio (SNR) of event waveforms, and enhanced event localization by applying a probability distribution function (PDF) based on the measured resolution of our interferometry. We developed a final linear discriminant cut for rejecting thermal and anthropogenic signals by dividing the continent into equal-area bins and optimizing the cut to each individual bin, so as to obtain the strongest possible the upper limit on cosmic neutrino flux
Cosmic ray instrumentation and simulations by Keith McBride( )

1 edition published in 2021 in English and held by 1 WorldCat member library worldwide

The natural phenomenon of cosmic radiation has been observed for over a hundred years and although many classes of objects have been identified as candidates, the origins of the galactic and the extragalactic components remain unconfirmed. The balloon-borne experiment, the ANtarctic Impulsive Transient Antenna (ANITA), observes the ice of Antarctica for signals from potential extragalactic ultra-high energy neutrinos. This thesis includes a chapter on my contribution to the ANITA collaboration. I updated the simulations of the detector to include the new hardware electronics responses and analyzed its effect on the sensitivity. This software package is used in analysis of the data extensively. The galactic cosmic ray nuclei spectra are missing key light isotope measurements at intermediately high energies. The upcoming project, the High Energy Light Isotope eXperiment (HELIX), will attempt to make these first-ever measurements. I aided in the construction, design, and testing of the Drift Chamber Tracker and the superconducting magnet for this experiment. I built the data acquisition system for the housekeeping sensors and power system including production-level circuit boards and software for readout. Finally, I performed an analysis on a diffusion-halo model of galactic cosmic-ray propagation to explore the constraining ability of newly released secondary-primary ratio data with expected HELIX measurements of the long-lived isotope, Beryllium-10
Reconstruction of Xmax and energy from 3 -- 100 PeV using 5 years of data from IceTop and IceCube and its applications by Andres Alberto Medina( )

1 edition published in 2021 in English and held by 1 WorldCat member library worldwide

The origin of cosmic rays has been an open problem for over a century. By measuring and modeling the energy spectrum and mass composition we can provide information towards solving this problem. The energy spectrum in particular has several features that hold key information to the propagation and sources of cosmic rays. The energy spectrum, which spans over several decades, can be described as a power-law with the slope defined by a value called the spectral index which ranges from values of 2.5 -- 3.3. Deviations of the spectral index mark key features of the energy spectrum such as the knee ($\approx$ $10^{15}$ eV), the second knee ($\approx$ $10^{17}$), the ankle ($\approx$ $10^{18.5}$) and a sharp drop off that occurs at the highest energies ($\approx$ $10^{19.5}$). We develop a hybrid model of a neural network to reconstruct the maximum atmospheric depth (Xmax) and a decision tree to reconstruct the energy for an extensive air shower that is detected by the IceCube Neutrino Observatory. The resolution of our models are about 41.6 $\rm{g/cm^2}$ for Xmax and 5.64\% for log10(E/GeV). Each of these is comparable with direct optical measurements of the shower. With these reconstructions we can construct kernels, using Monte Carlo simulations, that are capable of reproducing the probability density function of real data through a weighted sum of the kernels for a showers predicted Xmax binned by the showers predicted energy. We use weights (species fractions) predicted by models, such as H3A and H4A, and use the resulting fits to determine how well those models represent the propagation and production of cosmic rays. The H3A and H4A in particular use a physical phenomenon called a Peters cycle where rigidity is expected to be the governing variable for confinement and acceleration of cosmic rays
 
Audience Level
0
Audience Level
1
  General Special  
Audience level: 0.00 (from 0.00 for The elemen ... to 0.00 for The elemen ...)

Languages