Drift and separation in collisionality gradients

I. E. Ochs, J. M. Rax, R. Gueroult, N. J. Fisch

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We identify a single-particle drift resulting from collisional interactions with a background species, in the presence of a collisionality gradient and background net flow. We analyze this drift in different limits, showing how it reduces to the well known impurity pinch for high-Zi impurities. We find that in the low-temperature, singly ionized limit, the magnitude of the drift becomes mass-dependent and energy-dependent. By solving for the resulting diffusion-advection motion, we propose a mass-separation scheme that takes advantage of this drift, and analyze the separative capability as a function of collisionally dissipated energy.

Original languageEnglish (US)
Article number083503
JournalPhysics of Plasmas
Issue number8
StatePublished - Aug 1 2017

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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