13.4 CRITICAL TECHNOLOGY DEVELOPMENT The critical development areas identified in Section 11 risk assessment that directly bear on the ground test are the dc-rf converter and phase control technologies. Waveguide and structural materials are critical but are more appropriately identified with a flight test program to be covered in Section 14. 13.4.1 AMPLITRON The amplitron development involves three sequential tasks: Task 1 Design, fabricate and cold test three to five models for evaluation of efficiency and noise; build test equipment and optimize the design. Task 2 Build 10 to 15 models to obtain a statistical evaluation of performance, to determine filter requirements, and to iterate the design. Task 3 Design and test the power control and filter circuits; conduct interface tests; design tooling for production of ground test models. 13.4.2 KLYSTRON Similar tasks cannot be started for the klystron MPTS converter candidate until further theoretical study is carried out to obtain solutions to the heat transfer problem and to better define characteristics for the highest efficiency design, involving a second harmonic cavity and collector depression. Technology requirements include cathode emitters with 30 year life (a cold cathode might be feasible) and heat pipes with a 30 year life. 13.4.3 PHASE CONTROL The phase control technology program consists of a series of system analyses and simulation tasks and circuit development tasks: a. Analysis and Simulation - Define methodology, simulate uplink and downlink propagation, model thermal distortion, develop ground algorithms,
RkJQdWJsaXNoZXIy MTU5NjU0Mg==