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Title: Measurements of correlations enhanced collision rates in the mildly correlated regime (Γ~1)

Abstract

We measure the perpendicular-to-parallel collision rate ν ⊥|| in laser cooled, magnetized ion plasmas in the mildly correlated regime of Γ~1 and find collision rates enhanced by exp(Γ). This ν⊥|| enhancement due to correlations is directly analogous to the enhancement of fusion collisions in hot dense stellar plasmas, as first analyzed by Salpeter [Aust. J. Phys. 7, 373 (1954)]. The enhancement is caused by screening of the repulsive Coulomb potential between charges, allowing closer collisions for a given relative energy. The measurements indicate that the screening is done by thermal particles and allows us to rule out dynamical screening theories, which predict no enhancement to the collisions rate for Γ≲ 1.

Authors:
 [1];  [1];  [1];  [1]
  1. Univ. of California, San Diego, CA (United States)
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1535338
Alternate Identifier(s):
OSTI ID: 1395382
Grant/Contract Number:  
SC0002451; SC0008693
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 9; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Physics

Citation Formats

Anderegg, F., Dubin, D. H. E., Affolter, M., and Driscoll, C. F. Measurements of correlations enhanced collision rates in the mildly correlated regime (Γ~1). United States: N. p., 2017. Web. doi:10.1063/1.4999350.
Anderegg, F., Dubin, D. H. E., Affolter, M., & Driscoll, C. F. Measurements of correlations enhanced collision rates in the mildly correlated regime (Γ~1). United States. doi:10.1063/1.4999350.
Anderegg, F., Dubin, D. H. E., Affolter, M., and Driscoll, C. F. Thu . "Measurements of correlations enhanced collision rates in the mildly correlated regime (Γ~1)". United States. doi:10.1063/1.4999350. https://www.osti.gov/servlets/purl/1535338.
@article{osti_1535338,
title = {Measurements of correlations enhanced collision rates in the mildly correlated regime (Γ~1)},
author = {Anderegg, F. and Dubin, D. H. E. and Affolter, M. and Driscoll, C. F.},
abstractNote = {We measure the perpendicular-to-parallel collision rate ν⊥|| in laser cooled, magnetized ion plasmas in the mildly correlated regime of Γ~1 and find collision rates enhanced by exp(Γ). This ν⊥|| enhancement due to correlations is directly analogous to the enhancement of fusion collisions in hot dense stellar plasmas, as first analyzed by Salpeter [Aust. J. Phys. 7, 373 (1954)]. The enhancement is caused by screening of the repulsive Coulomb potential between charges, allowing closer collisions for a given relative energy. The measurements indicate that the screening is done by thermal particles and allows us to rule out dynamical screening theories, which predict no enhancement to the collisions rate for Γ≲ 1.},
doi = {10.1063/1.4999350},
journal = {Physics of Plasmas},
number = 9,
volume = 24,
place = {United States},
year = {2017},
month = {9}
}

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