Figure 6-34. Subarray Layout degree of outgassing are questions to be answered for MPTS. The outgassing concern stems from the potential arcing problem for open-tube amplitron or klystron design if contaminants are prevalent. The use of sealed jackets adds weight, but more importantly degrades reliability at least in earth-based applications. It may be that a baffle or molecular barrier would suffice to prevent arcing without reliability degradation; nevertheless the open tube construction would be a highly desirable goal, if not mandatory.
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