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Faster-than-Bohm Cross-B Electron Transport in Strongly Pulsed Plasmas
Royal Institute Technology, EE, Div Space and Plasma Phys, SE-10044 Stockholm, Sweden .
University Iowa, Department Phys and Astron, Iowa City, IA 52242 USA .
Linköping University, Department of Physics, Chemistry and Biology, Plasma and Coating Physics. Linköping University, The Institute of Technology.
Royal Institute Technology, EE, Div Space and Plasma Phys, SE-10044 Stockholm, Sweden .
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2009 (English)In: PHYSICAL REVIEW LETTERS, ISSN 0031-9007, Vol. 103, no 22Article in journal (Refereed) Published
Abstract [en]

We report the empirical discovery of an exceptionally high cross-B electron transport rate in magnetized plasmas, in which transverse currents are driven with abruptly applied high power. Experiments in three different magnetic geometries are analyzed, covering several orders of magnitude in plasma density, magnetic field strength, and ion mass. It is demonstrated that a suitable normalization parameter is the dimensionless product of the electron (angular) gyrofrequency and the effective electron-ion momentum transfer time, omega(ge)tau(EFF), by which all of diffusion, cross-resistivity, cross-B current conduction, and magnetic field diffusion can be expressed. The experiments show a remarkable consistency and yield close to a factor of 5 greater than the Bohm-equivalent values of diffusion coefficient D-perpendicular to, magnetic-diffusion coefficient D-B, Pedersen conductivity sigma(P), and transverse resistivity eta(perpendicular to).

Place, publisher, year, edition, pages
2009. Vol. 103, no 22
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-52768DOI: 10.1103/PhysRevLett.103.225003OAI: oai:DiVA.org:liu-52768DiVA: diva2:285496
Note

Original Publication: N Brenning, R L Merlino, Daniel Lundin, M A Raadu and Ulf Helmersson, Faster-than-Bohm Cross-B Electron Transport in Strongly Pulsed Plasmas, 2009, PHYSICAL REVIEW LETTERS, (103), 22, . http://dx.doi.org/10.1103/PhysRevLett.103.225003 Copyright: American Physical Society http://www.aps.org/

Available from: 2010-01-12 Created: 2010-01-12 Last updated: 2015-05-28

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