To obtain the appropriate data, it is necessary to run a large number of these computations in which the temperature at the outer edge is varied and in which the degree of taper is varied. From a practical point of view, the outer edge of the radiating fin would have to have some thickness. In the calculations a thickness of 1/2 millimeter or 0.020 inch was used. The results of the computerized computation are shown in Figure 6. Shown in Figure 6 are contours of a constant value of temperature at the inner radius, because this temperature may be the limiting condition imposed upon operation of the magnetron. To illustrate the use of the curves, select the contour that gives the desired temperature at inner radius of radiator. Then select the desired value of power to be dissipated from those given as ordinate values along the left side of the Figure. Then horizontally project this value to the right until it intersects with the inner radius temperature curve. The vertical projection of this point determines both the thickness of the radiator at its inner edge and the mass of the radiator in grams. Temperature at the outer edge of the radiator may also be determined from the four contours of constant outer edge temperature.
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