Bulletin of the American Physical Society
60th Annual Meeting of the APS Division of Plasma Physics
Volume 63, Number 11
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session TP11: Poster Session VII: Basic Plasma Physics: Pure Electron Plasma, Strongly Coupled Plasmas, Self-Organization, Elementary Processes, Dusty Plasmas, Sheaths, Shocks, and Sources; Mini-conference on Nonlinear Waves and Processes in Space Plasmas - Posters; MHD and Stability, Transients (2), Runaway Electrons; NSTX-U; Spherical Tokamaks; Analytical and Computational Techniques; Diagnostics (9:30am-12:30pm)
Thursday, November 8, 2018
OCC
Room: Exhibit Hall A1&A
Abstract ID: BAPS.2018.DPP.TP11.39
Abstract: TP11.00039 : Proposed Experiment to Measure Test Particle Diffusion in a Correlated Nonneutral Plasma*
Presenter:
Daniel H E Dubin
(Univ of California - San Diego)
Authors:
Daniel H E Dubin
(Univ of California - San Diego)
Francois Anderegg
(Univ of California - San Diego)
Charles Fred Driscoll
(Univ of California - San Diego)
We have measured cross-magnetic-field test particle diffusion D due to long range collisions in plasmas with rc< λD and 0.05 eV<T<3 eV. We propose to extend these measurements to lower temperature, where ions become correlated. Magnesium ion plasmas are routinely cooled down to T= 5x10-6eV resulting in a correlation parameter Γ=(e2/aT)~10. We have measured collisional equipartition rates in this regime, and observe a Salpeter enhancement of 109x over the rate neglecting correlations [1]. For a diffusion measurement, laser cooling with a standard cyclic transition is used to optically pump all ions into one electronic spin state. The inner radial part of the plasma can then be tagged by reversing the spins using direct optical pumping. These “spin reversed” test particles can be followed as they diffuse across the magnetic field, using a weak probe tuned to a cyclic transition. We intend to test theory [2] for Γ>1 predicting decreasing D as T decreases, and a transition from D~ B-2 to D~B-1 .
[1] F. Anderegg et al., PRL, 102, 185001 (2009).
[2] T. Ott and M. Bonitz, PRL, 107, 135003 (2011); S.D. Baalrud and J. Daligaut, Phys. Rev. E 96, 043202 (2017).
*Supported by DOE Grants DE-SC0008693 and DE-SC0018236.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.TP11.39
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