The specific cost for the graphite composite option was left on a $/kg basis due to the exceptionally high material and processing costs forecasted. However, later estimates obtained by Grumman for the structure indicated the mean value could be lowered (see below). A 10 percent differential relative to the structure cost was added to cover more extensive assembly and processing requirements. Transmitting Antenna Subarrays - DC-RF Converters (Item 4. 5) Cost and weight in the amplitrons was reduced to represent the movable pole piece design instead of the impulse magnet design. There is greater confidence in parameters for the former. Cost on the klystrons was adjusted only slightly downward to reflect a later estimate. Mechanical Systems (Items 5. 1, 5. 3) Overall weight was reduced by about 30 percent to correct an error in the original estimate. Cost for the structure in aluminum was reduced from 134 $/kg to 8 $/kg, which represents quoted cost for large quantities of stock aluminum suitably anodized, The higher estimate was for a low quantity of relatively complex pieces. The graphite cost was reduced by about 50 percent to reflect large quantity manufacture. The screwjack actuator estimate was substantially increased to better reflect the electromechanical complexity of this key item. 12.3.2 EFFICIENCY BUDGET The final efficiency budget for MPTS is given in Figure 12-32 for initial implementation and for what are believed to be goals that could be realized as the technology matures into the next century* A competitive program must strive to achieve these goals. We see that an overall 58 percent efficiency used in the parametric study at a beam efficiency of 90 percent falls midway between the initial and goal totals for the amplitron, and so is representative of a nominal performance. The klystron efficiency falls at the goal level and so the parametric study depicted a relatively optimistic picture.
RkJQdWJsaXNoZXIy MTU5NjU0Mg==