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Title: Emergence of kinetic behavior in streaming ultracold neutral plasmas

We create streaming ultracold neutral plasmas by tailoring the photoionizing laser beam that creates the plasma. By varying the electron temperature, we control the relative velocity of the streaming populations, and, in conjunction with variation of the plasma density, this controls the ion collisionality of the colliding streams. Laser-induced fluorescence is used to map the spatially resolved density and velocity distribution function for the ions. We identify the lack of local thermal equilibrium and distinct populations of interpenetrating, counter-streaming ions as signatures of kinetic behavior. Experimental data are compared with results from a one-dimensional, two-fluid numerical simulation.
Authors:
; ; ;  [1]
  1. Department of Physics and Astronomy and Rice Quantum Institute, Rice University, Houston, Texas 77005 (United States)
Publication Date:
OSTI Identifier:
22408375
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COLD PLASMA; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; DISTRIBUTION FUNCTIONS; ELECTRON TEMPERATURE; EXPERIMENTAL DATA; FLUORESCENCE; ION-ION COLLISIONS; LASER-PRODUCED PLASMA; ONE-DIMENSIONAL CALCULATIONS; PLASMA DENSITY; STREAMS; THERMAL EQUILIBRIUM