A study of the nonlinear saturation by mode coupling of the dissipative trapped-ion mode is presented in which both radial and poloidal variations are considered. The saturation mechanism consists of the nonlinear coupling via E x B convection of energy from linearly unstable modes to stable modes. Stabilization is provided at short poloidal wavelengths by Landau damping from trapped and circulating ions, at short radial wavelengths by effects associated with the finite ion banana excursions and at long wavelengths by ion collisions. A one-dimensional, nonlinear partial differential equation for the electrostatic potential derived in earlier work is extended to two dimensions and to third order in amplitude. Included systematically are kinetic effects, e.g., Landau damping and its spatial dependence due to magnetic shear. The stability and accessibility of equilibria are considered in detail for cases far from as well as close to marginal stability. In the first case three-wave interactions are found to be important when the spectrum of unstable modes is sufficiently narrow. In the latter case, it is found that for a single unstable mode, a four-wave interaction can provide the dominant saturation mechanism. Cross-field transport is calculated, and the scaling of results is considered for tokamak parameters.

The impact of the advances in the miniaturization of electronic components is related. The standardization program at LLL is reviewed; its principles should find application elsewhere. A small computer users library maintains master software tapes, documentation, educational materials, and catalogs. Other aspects of the program include software licensing agreements, the LSI-11 bulletin, EE bulletin, users meetings, stores stock and documentation, publications, educational facilities, hardware designs, memory programming center, simulators, and application assistance. 6 figures. (RWR)

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Audio recording of oral history with Hal L. Bridges. Interview conducted by Thad Sitton.