Figure 5-5. Klystron Operation Available Power Usage In the amplitron case, the same modes of operation are analyzed as for the klystron. Figure 5-6 shows the superposition of the amplitron characteristics with the solar cell characteristics. For these potential operating modes the percentage usage of available power is given as follows: We see that there is a significant disadvantage in operating the amplitron unregulated. The constant current mode of operation is recommended because it has both good phase stability (see Section 4) and power usage. Regulation for constant phase may be superior overall because of higher beam efficiency or possibly easier implementation. It is therefore recommended to be investigated as an option. 5.3 POWER DISTRIBUTION FLOW PATHS Three alternate flow paths for the dc power in the microwave array can be projected as possible options: lateral power flow, circular power flow and radial power flow. To enable analysis of the distribution system, the microwave transmitting array was subdivided into an arbitrary network of equal power areas. This is indicated by Figure 5-7, with a distribution grid superimposed for the lateral and circular flow paths as indicated by Figure 5-8 and 5-9. Analysis of the system consisted of subdividing the distribution into four categories, identified as primary feeders, secondary feeder, testing feeders and subarray distribution. These are identified for the lateral flow case in Figure 5-9. Methodology involved in comparing the flow systems is as follows:
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