power generated is near the output of the device. The circuit losses were determined to be 2.7 percent when operating with an rf gain of 7 dB and generating 5000 watts of power output. The slow-wave network in the MPTS amplitron is similar to that used in other Raytheon amplitrons and circuit losses of approximately 3 percent have been measured in hot test. The QK1224 amplitron, for example, utilized a similar circuit in which all the components were water cooled, and the power dissipated in the various tube components were measured. When operating QK1224 model #8 at the 425 kW level the useful rf power output and various dissipated powers were proportioned as follows: The circuit losses can be related to mechanical as well as electrical properties of the slow-wave structure. Special fabrication techniques are required to produce circuits with high circuit efficiency. These techniques must suppress multipactor. 4.1.2 PYROLYTIC GRAPHITE RADIATOR Radiating fins of pyrolytic graphite heat fins are made as tapered cones, so during heating and cooling cycles they can bend slightly without setting up undue stresses. 4.1.3 MAGNETIC CIRCUIT A Raytheon computer program was used to design a Sm-Co magnetic circuit for the amplitron at a frequency of 2450 MHz. The design of the magnetic circuit is important in achieving a lightweight tube. Radially-gaussed samarium-cobalt magnets are to be used on the amplitron. This magnetic circuit develops the required 2940 gauss in the interaction region with 167 grams of Sm-Co magnet. A pole piece is employed for field shaping, and a steel flux return path is used.
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