Current Distribution in Crossed-Field Accelerators. Part 4. Project Summary and Application
Final rept. 1 Jul 1969-30 Sep 1970
STD RESEARCH CORP ARCADIA CA
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Realistic analytical modeling of crossed-field accelerators is obtained by computing the development of turbulent magnetohydrodynamic boundary layers on the walls and the coupled two-dimensional distributions of current density, plasma properties, and fluid velocity, temperature and pressure over the entire channel. The analysis is based on methods developed in previous work by the authors, and considers the effects of electron nonequilibrium, thermal and concentration diffusion, suppression of turbulence by magnetic fields, finite reaction rates, and electron energy relaxation. Application to the Hirho channel gives excellent agreement with experimental results. It is shown that the reduction of the Hall field in Faraday channels is due to the fact that local axial current density is present over most of the flow, even when there is no net current leakage along the channel. The modeling is carried out by a well- documented computer program, of which a program listing, Fortran source deck, and explanation of input and output formats are provided. This work has demonstrated that realistic computations are necessary for the design of efficient magnetohydrodynamic channels.
- Plasma Physics and Magnetohydrodynamics