Publications (21)
Velocity Relaxation in a Strongly Coupled Plasma
G. Bannasch, J. Castro, P. McQuillen +2
Collisional relaxation of Coulomb systems is studied in the strongly coupled regime. We use an optical pump-probe approach to manipulate and monitor the dynamics of ions in an ultr…
A Highly-Sensitive Cryogenic Phased Array Feed for the Green Bank Telescope
D. Anish Roshi, W. Shillue, J. R. Fisher +15
In this paper, we describe the development of a new L-band (1.4 GHz) Cryogenic Phased Array Feed (PAF) system, referred to as the GBT2 array. Results from initial measurements made…
High Resolution Ionization of Ultracold Neutral Plasmas
P. McQuillen, J. Castro, T. C. Killian
Collective effects, such as waves and instabilities, are integral to our understanding of most plasma phenomena. We have been able to study these in ultracold neutral plasmas by sh…
Creating and studying ion acoustic waves in ultracold neutral plasmas
T. C. Killian, P. McQuillen, T. M. O'Neil +1
We excite ion acoustic waves in ultracold neutral plasmas by imprinting density modulations during plasma creation. Laser-induced fluorescence is used to observe the density and ve…
Experimental Realization of an Exact Solution to the Vlasov Equations for an Expanding Plasma
S. Laha, P. Gupta, C. E. Simien +4
We study the expansion of ultracold neutral plasmas in the regime in which inelastic collisions are negligible. The plasma expands due to the thermal pressure of the electrons, and…
Stabilization of magnetic polarons in antiferromagnetic semiconductors by extended spin distortions
J. Castro, I. Gonzalez, D. Baldomir
We study the problem of a magnetic polaron in an antiferromagnetic semiconductor (ferron). We obtain an analytical solution for the distortion produced in the magnetic structure of…