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1992 (2)
1Author    U. Wolf, H. SchamelRequires cookie*
 Title    Polarisation in the Temperature Equilibration of Anisotropic Plasmas  
 Abstract    The polarisation effect on the isotropisation of a magnetized bi-Maxwellian plasma is investigated in the weak coupling approximation. Based on the Rostoker collision operator, which reduces in the magnetic field free limit to the Balescu-Lenard operator, the equipartition frequency v is evaluated numerically for 0 and analytically for B-*oo, respectively. This frequency, depending non-linearly on e and B, describes the approach to thermodynamic equilibrium of the anisotropy parameter e = TJT^ via de/dt — (1 — e) v(e, B). It is found that in both limits dynamical screening makes a negligible contribution to the relaxation process. For finite B a simplified, yet unexploited expression for v(a, B) is presented, which invokes three new functions. 
  Reference    Z. Naturforsch. 47a, 945—949 (1992); received June 12 1992 
  Published    1992 
  Keywords    Coulomb collisions, Weak coupling theory, Polarisation, Collision frequency 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0945.pdf 
 Identifier    ZNA-1992-47a-0945 
 Volume    47 
2Author    H. Schamel, G. HübnerRequires cookie*
 Title    Collisional Isotropisation of a Strongly Magnetized Anisotropic Plasma within the Weak Interaction Approximation  
 Abstract    The equipartition frequency v of an anisotropic plasma is calculated numerically and analytically within the Landau approach for strong magnetic fields and several new integral expressions for v are presented. In the ultra strong magnetic field case, when r c <^b, where r c is the Larmor radius and b the classical distance of closest approach, v is shown to be dependent on how the Coulomb force is cut off at short distances. None of the obtained expressions, however, coincides with experiment, in contrast to the strong interaction theory of O'Neil and Hjorth. For weaker, but still strong magnetic fields (r c >b) the ambiguity disappears and the weak interaction result describes well the experiment. It is, hence, the transition region r c ^b, where the transition from strong to weak interaction takes place. 
  Reference    Z. Naturforsch. 47a, 629—636 (1992); received December 31 1991 
  Published    1992 
  Keywords    Landau collision operator, Collision frequency, Magnetized plasma, Weak coupling theory, Strong coupling theory 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0629.pdf 
 Identifier    ZNA-1992-47a-0629 
 Volume    47