electrical bus losses). The magnetron design is therefore based on the dissipation capability of a pyrographite radiator 36.8 cm in outer diameter and 5.5 cm inner diameter, and tapered as shown in Figure 5. The power level of the associated magnetron is about 4 kilowatts. Given the dimensions of Figure 5, an assumption of radiation from one side only, and an emissivity of 0.92, the method of determining the total heat radiated and the temperature drop from the center of the radiator to its outer edge follows (1) divide the radiator into a large number of radial segments for computation purposes, (2) assume an average temperature for the outermost segment, (3) compute the heat radiated from the outermost segment, (4) compute the temperature drop associated with the radial flow of heat through the ring, (5) add this temperature drop to the radiating temperature of the outermost segment, (6) using the resulting temperature compute the heat radiated by the segment next to the outermost segment, (7) add this heat radiated to that radiated by the outermost segment, (8) using the resulting heat compute the temperature drop associated with its radial flow through the segment, (9) repeat the previous procedure for all segments. As the radius becomes less, the temperature will become greater until the maximum temperature is reached at the inside edge of the radiator. The temperature rise will obviously be a function of the amount of taper and also of the temperature itself as the heat conductivity varies with temperature, as shown in Figure 4. The total heat radiated will be the sum of the heat radiated by the individual segments.
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