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phys documents (dragged) 66 - 60 Physics Formulary by ir....

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Unformatted text preview: 60 Physics Formulary by ir. J.C.A. Wevers Here, a = e/m ( E + w B ) is the average acceleration, q = 1 2 nm v 2 t v t the heat fow, Q = mv 2 t r F t cr dv the source term For energy production, R is a Friction term and p = nkT the pressure. A thermodynamic derivation gives For the total pressure: p = nkT = i p i- e 2 ( n e + z i n i ) 24 D or the electrical conductance in a plasma Follows From the momentum balance, iF w e w i : J = E- J B + p e en e In a plasma where only elastic e-a collisions are important the equilibrium energy distribution Function is the Druyvesteyn distribution : N ( E ) dE = Cn e E E 3 / 2 exp- 3 m e m E E 2 dE with E = eE v = eE/n . 11.8 Collision-radiative models These models are rst-moment equations For excited states. One assumes the Quasi-steady-state solution is valid, where p> 1 [( n p / t = 0) ( ( n p w p ) = 0)] . This results in: n p> 1 t cr = 0 , n 1 t + ( n 1 w 1 ) =...
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This note was uploaded on 01/30/2011 for the course PHYSICS 208 taught by Professor Ye during the Spring '10 term at Blinn College.

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