Figure 4-3. Amplitron Current and Voltage Levels for Various Magnetic Field Levels a. The pyrolytic graphite radiators are the heaviest part of the tube. However, the density of pyrolytic graphite is only one fourth that of copper and its thermal conductivity is about twice as high as that of copper. Heat pipes, able to withstand the pressure involved and filled with a working fluid, are heavier than pyrolytic graphite. A radiating surface of course would still be required. Over one half of the weight, 1000 grams, is in the anode pyrolytic graphite radiator and another 71 grams are in the cathode radiator. b. The radially gaussed Sm-Co magnetic circuit makes a very efficient design. It presents a wide surface area and short depth of magnetic material to make efficient use of the very high coercive force of Sm-Co. It also has a short return path to conserve pole weight and reduce leakage flux. The nearly 3000 gauss is obtained with only 260 grams of Sm-Co and 100 grams of pole material. An energy product of 15 x 106 gauss-oersted was used in the design. c. The anode is made of solid copper. This is needed to conduct the heat from the vane face out to the pyrolytic graphite heat radiator. In the baseline design, the anode weighs 108 grams.
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