Anomalous heat flux inhibition under high frequency radiation pulse absorption in electron–ion collisions

Grishkov, V. E.; Uryupin, S. A.

doi:10.1016/j.physleta.2011.04.001

Cited by 3 publications

(1 citation statement)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…the heat-flow 'non-parallel' to −∇T e observed by Rickard et al [41]). Recent papers addressing the kinetic analysis of unmagnetized plasmas with super-Gaussian distribution functions support our findings [22,42]; indeed, though these articles do not discuss the physical basis for such effects, they also demonstrate both heat-flow in the direction ∇n e [22] and suppressed thermal conduction along −∇T e [22,42].…”

Section: Discussionsupporting

confidence: 75%

Super-Gaussian transport theory and the field-generating thermal instability in laser–plasmas

2013

View full text Add to dashboard Cite

Inverse bremsstrahlung (IB) heating is known to distort the electron distribution function in laser-plasmas from a Gaussian towards a super-Gaussian, thereby modifying the equations of classical transport theory (Ridgers et al 2008 Phys. Plasmas 15 092311). Here we explore these modified equations, demonstrating that super-Gaussian effects both suppress traditional transport processes, while simultaneously introducing new effects, such as isothermal (anomalous Nernst) magnetic field advection up gradients in the electron number density n e , which we associate with a novel heat-flow q n ∝ ∇n e . Suppression of classical phenomena is shown to be most pronounced in the limit of low Hall-parameter χ, in which case the Nernst effect is reduced by a factor of five, the ∇T e × ∇n e field generation mechanism by ∼30% (where T e is the electron temperature), and the diffusive and Righi-Leduc heat-flows by ∼80 and ∼90% respectively. The new isothermal field advection phenomenon and associated density-gradient driven heat-flux q n are checked against kinetic simulation using the Vlasov-Fokker-Planck code impact, and interpreted in relation to the underlying super-Gaussian distribution through simplified kinetic

show abstract