Superbanana transport in the collisional heating of a plasma column forced across a squeeze potential

Dubin, Daniel H.  E.

doi:10.1063/1.5001062

Title: Superbanana transport in the collisional heating of a plasma column forced across a squeeze potential

Journal Article · Tue Nov 28 00:00:00 EST 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5001062· OSTI ID:1514862

Dubin, Daniel H. E. ^[1]

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

When weakly collisional plasmas have locally trapped particle populations, perturbations to the plasma equilibrium (such as waves or static field-errors) can induce phase-space discontinuities in the particle distribution function that strongly enhance entropy production, plasma loss, and wave damping via superbanana transport. Here, this paper presents a simple version of this superbanana transport process, wherein a plasma is heated as it is slowly forced back and forth across a squeeze potential (at a frequency ω that is small compared with the particle bounce frequency). The squeeze potential traps low-energy particles on either side of the squeeze, but particles with higher energy can pass through it. Trapped and passing particles have different responses to the forcing, causing a collisionless discontinuity in the distribution function at the separatrix between the trapped and passing particles. Expressions for both the adiabatic and non-adiabatic distribution functions are presented, and the heating rate caused by collisional broadening of the separatrix discontinuity is derived. The heating rate is proportional to √νω , provided that ν<<ω, where ν is the collision rate (i.e., the √ν regime of superbanana theory).

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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

OSTI ID:: 1514862

Alternate ID(s):: OSTI ID: 1410465

Journal Information:: Physics of Plasmas, Vol. 24, Issue 11; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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