Indeed.
Reminded me of this failed escapade.
Borehole project Looks like they thought there was enough hot water down the hole for their needs and there wasnt. Makes me wonder how Carleton College have done the trick.
Thanks for the link -it took me to Klystrons a similar technology, and reminded me of matters nearly forgotten, from the Tropospheric Forward Scatter links which I worked on for a long time. Velocity modulation, excited cavities, wave guides. Water cooled valves - popping down to the local Dhobi for fresh supplies of distilled water - and the enormous voltages. Each cabinet had the nicely named 'dead mans stick' to earth everything before touching it.
I remember a warning of the dangers of Beryllium on the spare valve box, and of course worried about it. I don't recall ever having to replace a valve though, but I was right to be concerned, as I now find that -
"The work of physicist W. W. Hansen was instrumental in the development of the klystron and was cited by the Varian brothers in their 1939 paper. .[1] Hansen died of beryllium disease in 1949 as a result of exposure to beryllium oxide (BeO). "
I also worried about being exposed to so much RF radiation for long periods. I couldn't find out anything about it all so soldiered on. I think I have survived - though others may disagree. I consoled myself that I was behind the four 20metre dishes and not in front of them.