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

  • 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 ...
  • Cosmic Dust Aggregation with Stochastic Charging 

    Matthews, L.S.; Shotorban, B.; Hyde, T.W. (Astrophysical Journal, 2013-10-04)
    The coagulation of cosmic dust grains is a fundamental process which takes place in astrophysical environments, such as presolar nebulae and circumstellar and protoplanetary disks. Cosmic dust grains can become charged ...
  • Photophoresis on polydisperse basalt microparticles under microgravity 

    Kupper, M.; de Beule, C.; Wurm, G.; Matthews, L.; Kimery, J.; Hyde, T.W. (Journal of Aerosol Science, 2014-10)
    Photophoresis is a force which can dominate the motion of illuminated aerosols in low pressure environments of laboratory experiments, planetary atmospheres or protoplanetary disks. In drop tower experiments we quantified ...
  • Interaction force in a vertical dust chain inside a glass box 

    Kong, J.; Qiao, K.; Matthews, L.S.; Hyde, T.W. (Physical Review E, 2014-07-31)
    Small number dust particle clusters can be used as probes for plasma diagnostics. The number of dust particles as well as cluster size and shape can be easily controlled employing a glass box placed within a Gaseous ...
  • Dust as probe for horizontal field distribution in low pressure gas discharges 

    Hartmann, P.; Kovacs, A. Z.; Carmona-Reyes, J.; Matthews, L.S.; Hyde, T.W. (Plasma Sources Science and Technology, 2014-06-23)
    Using dust grains as probes in gas discharge plasma is a very promising, but at the same time very challenging method, as the individual external control of dust grains has to be solved. We propose and demonstrate the ...
  • Slow Plastic Deformation (Creep) of 2D Dusty Plasma Solids 

    Hartmann, P.; Kovacs, A. Z.; Douglass, A. M.; Carmona-Reyes, J.; Matthews, L. S.; Hyde, T. W. (Physical Review Letters, 201-07-09)
    We report complex plasma experiments, assisted by numerical simulations, providing an alternative qualitative link between the macroscopic response of polycrystalline solid matter to small shearing forces and the possible ...
  • Mode couplings and resonance instabilities in dust clusters 

    Qiao, Ke; Van Oeveren, E.; Matthews, L.S.; Hyde, T.W. (Physical Review E, 2013-10-16)
    The normal modes for three to seven particle two-dimensional (2D) dust clusters in a complex plasma are investigated using an N-body simulation. The ion wakefield downstream of each particle is shown to induce coupling ...
  • Helical Structures in Vertically Aligned Dust Particle Chains in a Complex Plasma 

    Hyde, T. W.; Kong, J.; Matthews, L.S. (Physical Review E, 2013-05-16)
    Self-assembly of structures from vertically aligned, charged dust particle bundles within a glass box placed on the lower, powered electrode of a Gaseous Electronics Conference rf reference cell were produced and examined ...

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