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It is interesting having a look at that. I used to work on a RADAR system which used a cousin of the TWT, a multi cavity Klystron. 100W of RF in at the bottom, 1.2MW (Yes, Megawatts, though that is instantaneous power and the actual average power was quite low with a 1.2ms pulse at 750hz repetition rate) out at the top. Basically a five foot tall vacuum tube with pulsed -60KV on the cathode to make it go.
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