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Asymmetric diffusion in turbulent plasmas

Event Details

Event Dates: 

Friday, November 15, 2013 - 1:00pm

Seminar Location: 

  • Other

Seminar Location Other: 

Gamow F931

Speaker Name(s): 

Mikhail Medvedev

Speaker Affiliation(s): 

University of Kansas
Seminar Type/Subject

Scientific Seminar Type: 

  • Other

Seminar Type Other: 

Center for Integrated Plasma Studies

Event Details & Abstract: 

Particle transport in plasmas with turbulent magnetic fields in the presence of a gradient of the mean magnetic field and weak pitch-angle diffusion is analyzed. We demonstrate that such transport is described by asymmetric diffusion: the generalization of the conventional random walk process to the case of unequal transition probabilities. We construct a toy 1D Markov chain model and analytically demonstrate that the particle density distribution becomes exponential in distance, instead of linear as is the case of the standard diffusion process.

Implication of our results for the transport of cosmic rays are discussed.