Title: CONTROLLED DEORBIT

A detailed analysis was carried out of a fixed capacitor thyristor-controlled reactor type compensator, for dynamic power factor correction and terminal voltage stabilization of a thyristor phase-controlled inductive load. An equation for the firing angle of the reactor and Fourier coefficient equations of the load current, supply current and compensator current were derived and compared for typical circuits. Variation with load thyristor firing angle of the rms values of these currents, the firing angle of the compensator thyristor, the power factor and other quantities were tabulated and plotted as graphs. The magnitudes of different harmonic components of the three currentsmore » were also determined. It was discovered that, for load phase angles of less than 45 degrees, the load susceptance must be such that the lagging reactive component of the fundamental component of the load current at most load thyristor firing angles.« less

On-heating transformation kinetics were investigated for several steels by using a Gleeble capable of programmable power input as well as programmable temperature cycling. Transformation kinetics determined in both modes are reported. The temperature cycles are significantly different between the two modes due to the latent heat associated with the phase transformations. Both diffusion rates and transformation driving force increase with temperature above the eutectoid temperature, therefore the latent heat can potentially have a significant impact on the transformation kinetics. Experiments with plain carbon steels illustrate that the latent heat of austenite formation causes an appreciable temperature arrest during transformation, andmore » the dilatation response is similarly altered. A kinetic transformation model, based on the decomposition of pearlite and the diffusional growth of austenite, reproduced the transient dilatation data obtained from both control modes reasonably well using the same kinetic parameter values.« less

This report surveys the need for large computers in analyzing the properties of magnetically confined plasmas and simulating the characteristics of fusion reactors. The major conclusion of the report is that, to meet the program schedule developed by Magnetic Confinement Systems, it would be necessary to immediately scale up the CTR (controlled thermonuclear research) computerized effort to a level of two Class IV computers by FY 1975. Based on this report, and in an attempt to best meet this need, it was decided to establish the National CTR Computer Center at the Lawrence Livermore Laboratory.