By John Sheffield (Auth.)
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Additional info for Plasma Scattering of Electromagnetic Radiation
Example text
1 4 - 3 2 2 e 2 6 Q 2 1 3 s (1) It is assumed that the distribution function does not change significantly during the integration time T. This is certainly true in the equilibrium case when we may use a Maxwellian distribution function. It is n o t necessarily true if the distribution function is anisotropic, if the electrons and ions have different temperatures, or if the distribution is sufficiently extreme that the system is unstable. In any of these situations there will be interactions (collisions) acting to restore equilibrium, and the scattering result will depend on the ratio T / T , where T is the appropriate collision time.
1 The relation of the scattering volume to the radiation collection system. In the volume V are N electrons, and N/Z ions of charge Ze. Overall the volume is electrically neutral, but locally the net charge fluctuates about the mean level. The scattering comes from these fluctuations. 1) £5(r-r,(t))a(y-v,(t)). F„(r,v,f) = s= 1 This gives the number of particles of species q per unit volume in phase space, with velocity v at position r at time t. 3) a = (q/m)[E + (v/c) x B ] . 2 Kinetic E q u a t i o n s for a P l a s m a 27 where q = — e, m = m for electrons, q = Ze, m = m , N —• N/Z for ions.
J>lasma Viewing dump 56 3 H e ^ce 0 w ce Scattered light Intensity 2 Incoherent Scattering—Low-Temperature Plasma \% 0 l£ Fig. 10 Scattered radiation spectrum from a magnetized plasma, X = 6943 A , 6 = 30° ± 0 . 4, T = 20eV, B = 16kG. [Courtesy Carolan and Evans (1972). Contributed paper. Proc. Int. Conf. Ioniz. ] { e Tokamak's, for which this measurement is of interest, there would be insufficient scattered p h o t o n s to permit resolution of the modulation by conventional means for a ruby laser source.
