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

Anderegg, F.; Dubin, D. H.  E.; Affolter, M.; Driscoll, C. F.

doi:10.1063/1.4999350

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

Journal Article · Thu Sep 28 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4999350· OSTI ID:1535338

Anderegg, F. ^[1]; Dubin, D. H. E. ^[1]; Affolter, M. ^[1]; Driscoll, C. F. ^[1]

Univ. of California, San Diego, CA (United States)

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.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0002451; SC0008693

OSTI ID:: 1535338

Alternate ID(s):: OSTI ID: 1395382

Journal Information:: Physics of Plasmas, Vol. 24, Issue 9; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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