A known nonlocal model of electron heat flux, applying for (scale length/thermal ion-electron mean-free path) of order Z) /2 (e*/T) 312 , ionization number Z, large, and e*~ 6.5 T (the energy of electrons carrying most of the flux), is reconsidered. The large e*/T ratio simplifies the complete formalism. A simple flux formula, exact for both smooth and steep profiles, is given. Thermoelectric effects and other models are discussed.Heat transport is essential to the physics of laser targets. Albritton et al. x gave a self-consistent calculation of nonlocal heat flux q in a weakly collisional regime. In the present work we reconsider their model and give new results and simplifications.We first review the model conditions not quite stated in Ref. 4 In A el , the symbols being as usual. In the free-streaming operator, and based on both the small value of the mass ratio and flow quasineutrality, (i) we have neglected the time derivative d / dt and terms arising in the ion frame from ion hydrodynamics. The energy dependence of mean-free paths allows us to assume that (ii) main-body electron are near-Maxwellian, but (iii) those contributing dominantly to q, characterized by an energy e* ~ 6.5 T, 3 are not. Taking Z, large allows us to also assume (iv) that e* electrons are nonetheless nearisotropic. For e~e* and /=:/> (isotropic), 2 C« = 7n?k " x (/do) [
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