5.2 KLYSTRON The klystron amplifier was used in the reference SPS design developed by Boeing in 1980. The best demonstrated efficiency of a klystron is 74%; the best attainable efficiency is probably about 85%.(6) The design reference used here is Ref #10, p 175ff. In order to increase the lunar material content of the klystron, aluminum has been substituted for copper in the electromagnet. Aluminum has 64.9% of the conductivity of copper, hence requires 1.541 times the cross sectional area to carry the same current. The ratio of densities of aluminum to copper is 2.70/8.89 or copper. To be conservative, a factor of 0.50 was used when making mass calculations. The particular klystron design analysed is as follows: TABLE 5.2-1 KLYSTRON MASS STATEMENT
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