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.

Sub-communities within this community

Recent Submissions

  • Discrete stochastic charging of aggregate grains 

    Matthews, Lorin; Shotorban, Babak; Hyde, Truell W. (Physical Review E, 2018-05)
    Dust particles immersed in a plasma environment become charged through the collection of electrons and ions at random times, causing the dust charge to fluctuate about an equilibrium value. Small grains (with radii less ...
  • Transport properties of disordered 2D complex plasma crystal 

    Kostadinova, Eva; Guyton, Forest; Cameron, Adam; Busse, Kyle; Liaw, Constanze; Matthews, Lorin S.; Hyde, Truell W. (Contributions to Plasma Physics, 2018-01)
    In this work, we investigate numerically the transport properties of a 2D complex plasma crystal using diffusion of coplanar dust lattice waves. In the limit where the Hamiltonian interactions can be decoupled from the ...
  • The magnetic field inside a protoplanetary disk gap opened by planets of different masses 

    Carballido, Augusto; Matthews, Lorin; Hyde, Truell W. (Monthly Notices of the Royal Astronomical Society, 2017)
    We perform magnetohydrodynamic simulations of protoplanetary disc gaps opened by planets of various masses, with the aim of calculating the strength of the vertical magnetic field threading such gaps. We introduce a ...
  • Delocalization in infinite disordered two-dimensional lattices of different geometry 

    Kostadinova, Eva; Busse, Kyle; Ellis, Naoki; Padgett, Josh; Liaw, Constanze; Matthews, Lorin S.; Hyde, Truell W. (Physical Review B, 2017-12-06)
    The spectral approach to infinite disordered crystals is applied to anAnderson-type Hamiltonian to demonstrate the existence of extended states for nonzero disorder in 2D lattices of different geometries. The numerical ...
  • Simple experiment on the sputtering rate of solids in gas discharges 

    Hartmann, Peter; Carmona-Reyes, Jorge; Korolov, I.; Matthews, Lorin S.; Hyde, Truell W. (Physics of Plasmas, 2017-06)
    We present a very simple and sensitive method to measure the sputtering rate of solid materials in stationary low-pressure gas discharges. The method is based on the balance of the centrifugal force and the confinement ...
  • Physical interpretation of the spectral approach to delocalization in infinite disordered systems 

    Kostadinova, Eva; Liaw, Constanze; Matthews, Lorin; Hyde, Truell (Materials Research Express, 2016-12-05)
    In this paper we introduce the spectral approach to delocalization in infinite disordered systems and provide a physical interpretation in context of the classical model of Edwards and Thouless. We argue that spectral ...
  • Using Dust as Probes to Determine Sheath Extent and Structure 

    Douglass, Angela; Land, Victor; Matthews, Lorin; Hyde, Truell W. (Journal of Plasma Physics, 2016-07)
    Two in situ experimental methods are presented in which dust particles are used to determine the extent of the sheath and gain information about the time-averaged electric force profile within a radio frequency (RF) plasma ...
  • Multipole Expansions of Aggregate Charge: How Far to Go? 

    Matthews, Lorin; Coleman, Douglas A.; Hyde, Truell W. (IEEE Transactions on Plasma Science, 2016-04)
    Aggregates immersed in a plasma or radiative environment will have charge distributed over their extended surface. Previous studies have modeled the aggregate charge using the monopole and dipole terms of a multipole ...
  • Coagulation in the Vicinity of a Gap-Opening Jupiter-Mass Planet 

    Carballido, Augusto (Astrophysical Journal, 2016-06)
    We analyze the coagulation of dust in and around a gap opened by a Jupiter-mass planet. To this end, we carry out a high-resolution magnetohydrodynamic (MHD) simulation of the gap environment, which is turbulent due to the ...
  • Temperature Measurements of a Dust Particle 

    Kong, Jie; Qiao, Ke; Matthews, Lorin; Hyde, Truell W. (Journal of Plasma Physics, 2016-09)
    The thermal motion of a dust particle levitated in a plasma chamber is similar to that described by Brownian motion in many ways. The primary difference between a dust particle in a plasma system and a free Brownian particle ...
  • Ion-wake Field inside a Glass Box 

    Chen, Mudi; Dropmann, Michael; Matthews, Lorin; Hyde, Truell W. (Physical Review E, 2016-09)
    The confinement provided by a glass box is proving ideal for the formation of vertically aligned structures and a convenient method for controlling the number of dust particles comprising these dust structures as well as ...
  • Mapping of force field in a capacitively driven rf plasma discharge 

    Dropmann, Michael; Chen, Mudi; Sabo, Hannah; Laufer, Rene; Herdrich, Georg; Matthews, Lorin; Hyde, Truell W. (Journal of Plasma Physics, 2016-07)
    In this paper a method is described that allows mapping of the forces acting on dust particles in a GEC reference cell. Monodisperse particles are dropped into the plasma environment and their trajectories are tracked using ...
  • Analysis of Magnetic Field Plasma Interactions Using Micro Particles as Probes 

    Dropmann, Michael; Laufer, Rene; Herdrich, Georg; Matthews, L.S.; Hyde, T. W. (American Physics Society/ Physical Review E, 2015-08-26)
    The interaction between a magnetic field and plasma close to a nonconductive surface is of interest for both science and technology. In space, crustal magnetic fields on celestial bodies without atmosphere can interact ...
  • Photophoretic Force on Aggregate Grains, Monthly Notices of the Royal Astronomical Society 

    Matthews, Lorin; Kimery, J. B.; Wurm, G.; de Beule, C.; Kuepper, M; Hyde, T. W. (Monthly Notices of the Royal Astronomical Society, 2016-01-21)
    The photophoretic force may impact planetary formation by selectively moving solid particles based on their composition and structure. This generates collision velocities between grains of different sizes and sorts the ...
  • Dusty plasma cavities: Probe-induced and natural 

    Harris, Brandon; Matthews, Lorin S.; Hyde, Truell W. (American Physical Society, 2015-06-22)
    A comprehensive exploration of regional dust evacuation in complex plasma crystals is presented.Voids created in three-dimensional crystals on the International Space Station have provided a rich foundation for experiments, ...
  • Electrical Conductivity of the Thermal Dusty Plasma under the Conditions of a Hybrid Plasma Environment Simulation Facility 

    Zhukhovitskii, D.; Petrov, O.; Hyde, T. W.; Herdrich, G.; Laufer, R.; Dropmann, M.; Matthews, L. S. (New Journal of Physcis, 2015-05-27)
    We discuss the inductively heated plasma generator (IPG) facility in application to the generation of the thermal dusty plasma formed by the positively charged dust particles and the electrons emitted by them. We develop ...
  • Mode couplings and resonance instabilities in finite dust chains 

    Qiao, K.; Kong, J.; Matthews, L.; Hyde, T. W. (American Physical Society, 2015-05-08)
    Employing a numerical simulation, the normal modes are investigated for finite, one-dimensional horizontal dust chains in complex plasma. Mode couplings induced by the ion flow within the sheath are identified in the mode ...
  • Mode coupling and resonance instabilities in quasi-two-dimensional dust clusters in complex plasmas 

    Qiao, Ke; Kong, J.; Carmona, J.; Matthews, L. S.; Hyde, T. W. (American Physical Society, 2014-09-16)
    Small quasi-two-dimensional dust clusters consisting of three to eleven particles are formed in an argon plasma under varying rf power. Their normal modes are investigated through their mode spectra obtained from tracking ...
  • Two-dimensional and three-dimensional Coulomb clusters in parabolic traps 

    Myasnikov, M.; D'yachkov, L.; Petrov, O.; Hyde, T. W.; Kong., J.; Matthews, L. S. (AIP Publishing, 2014-09-08)
    We consider the shell structure of Coulomb clusters in an axially symmetric parabolic trap exhibiting a confining potential U_c(ρ,z)=(mω^2/2)(ρ^2+αz^2) . Assuming an anisotropic parameter α = 4 (corresponding to experiments ...
  • Measurement of net electric charge and dipole moment of dust aggregates in a complex plasma 

    Yousefi, Raziyeh; Davis, Allen; Carmona-Reyes, Jorge; Matthews, Lorin; Hyde, Truell (Physical Review E, 2014-09-02)
    Understanding the agglomeration of dust particles in complex plasmas requires knowledge of basic properties such as the net electrostatic charge and dipole moment of the dust. In this study, dust aggregates are formed from ...

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