CASPER
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CASPER conducts fundamental research in astrophysics, early universe cosmology, space physics, superstring / M theory, complex (dusty) plasma physics, hypervelocity impact (shock) physics and laser hypervelocity impact simulation physics.
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Recent Submissions
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A machine learning-based Bayesian optimization solution to nonlinear responses in dusty plasmas
(IOP PUblishing, 2021-06)Nonlinear frequency response analysis is a widely used method for determining system dynamics in the presence of nonlinearities. In dusty plasmas, the plasma–grain interaction (e.g. grain charging fluctuations) can be ... -
Anomalous Diffusion in One-Dimensional Disordered Systems: A Discrete Fractional Laplacian Method (Part I)
(IOP Publishing, 2020-04-03)This work extends the applications of Anderson-type Hamiltonians to include transport characterized by anomalous dffusion. Herein, we investigate the transport properties of a one dimensional disordered system that employs ... -
Numerical study of anomalous diffusion of light in semi-crystalline polymer structures
(American Physical Society, 2020-12)From the spread of pollutants in the atmosphere to the transmission of nutrients across cell membranes, anomalous diffusion processes are ubiquitous in natural systems. The ability to understand and control the mechanisms ... -
Dust as probes: Determining confinement and interaction forces
(IOP Publishing, 2020-10)The PK-4 system is a micro-gravity dusty plasma experiment currently in operation on-board the International Space Station. The experiment utilizes a long DC discharge in neon or argon gases. We apply our 2D particle-in-cell ... -
Ionization waves in the PK-4 direct current neon discharge
(American Physical Society, 2020-11)Complex plasmas are interesting systems as the charged dust can self-assemble into different types of ordered structures. To understand the mechanisms which govern the transitions from one type of structure to another, it ... -
Detailed model of the growth of fluffy dust aggregates in a protoplanetary disk: Effects of nebular conditions
(AAS Publishing, 2020-07)Coagulation of dust aggregates plays an important role in the formation of planets and is of key importance to the evolution of protoplanetary disks (PPDs). Characteristics of dust, such as the diversity of particle size, ... -
Dust charging in dynamic ion wakes
(AIP Publishing, 2020-02-14)A molecular dynamics simulation of ion flow past dust grains is used to investigate the interaction between a pair of charged dust particles and streaming ions. The charging and dynamics of the grains are coupled and derived ... -
Nonlinear mode coupling and internal resonance observed in a dusty plasma
(New Journal of Physics, 2009-10)In this paper, we report the first experimental observation of internal resonance in a dusty plasma, which shows the intrinsic nonlinearities of dust interactions in plasmas. When driving a system of vertically aligned ... -
Dust particle pair correlation functions and the non-linear effect of interaction potentials
(IEEE Transactions on Plasma Science, 2019-07)Dust temperature is a measure of the energy of the stochastic motion of a dust particle, and is a result of the combination of the Brownian motion and the fluctuations in the dust charge and confining electric field. A ... -
Initial Development and Validation of the Elementary Student Engagement Survey (ESES)
(2020-03-16)Student engagement has been researched from multiple perspectives in the literature due to its impact on academic attainment and other variables of interest. However, most of the research has focused on grades above ... -
Transforming teacher pedagogy to maximize 21st century skills through the learning environment
(2020-01-24)As schools redesign learning environments and equip classrooms with flexible furniture, it is imperative to examine this impact on teacher pedagogy and student learning. We investigated if classrooms equipped with flexible ... -
Investigating the Impact of Flexible Furniture in the elementary Classroom
(2020-01-24)Educators are beginning to consider the physical learning environment as an additional resource to meet the learning outcomes in modern classrooms. In order to better utilize classroom space, schools have begun to eliminate ... -
Initial Development and Validation of the Student Engagement for Students for Flexible Learning Environments (STUD-E Sflex) Assessment for Effective Intervention
(2020-01-10)Student engagement has been researched from multiple perspectives due to its impact on academic skill attainment. However, most of this research has focused on grades above elementary school, leaving a gap in student ... -
Comparison of Plasma Magnetic Field Interactions in a Static and Dynamic Plasma Facility
(Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan, 2016)Magnetic fields are a principal/widespread/promising tool/instrument in space technology design for the use in advanced propulsion concepts, shielding from radiation or to aid thermal protection during the atmospheric ... -
Dust particle pair correlation functions and the non-linear effect of interaction potentials
(IEEE Transactions on Plasma Science, 2019-07)Dust kinetic temperature is a measure of the energy of the stochastic motion of a dust particle and is a result of the combination of the Brownian motion and the fluctuations in the dust charge and confining electric field. ... -
Nonlinear response of vertical paired structure in complex plasma
(Plasma Physics and Controlled Fusion, 2019-03-21)The effect of the ion wake downstream of grains immersed in a flowing plasma is observed experimentally through the apparent non-reciprocal grain–grain interactions. Here we extend amplitude-frequency response analysis to ... -
Mapping the Plasma Potential in a Glass Box
(IEEE Transactions on Plasma Science, 2019-07)Modeling the dynamics of charged dust particles, confined in a glass box placed on the lower electrode of a Gaseous Electronics Conference cell, requires that the interactions between the charged dust, plasma, and boundaries ... -
Spectral approach to transport in the two-dimensional honeycomb lattice with substitutional disorder
(Physical Review B, 2019-01)The transport properties of a disordered two-dimensional (2D) honeycomb lattice are examined numerically using the spectral approach to the 2D percolation problem, characterized by an Anderson-type Hamiltonian. In our ... -
Self-diffusion in two-dimensional quasi-magnetized rotating dusty plasmas
(Physical Review E, 2019-01-10)The self-diffusion phenomenon in a two-dimensional dusty plasma at extremely strong (effective) magnetic fields is studied experimentally and by means of molecular dynamics simulations. In the experiment the high magnetic ... -
The initial structure of chondrule dust rims I: electrically neutral grains
(Icarus, 2019-03)In order to characterize the early growth of fine-grained dust rims (FGRs) that commonly surround chondrules in carbonaceous chondrites, we perform numerical simulations of dust accretion onto chondrule surfaces. We employ ...
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