This is the C-W 750 KV "Dome," one of the more interesting and photgraphed technical sights at Fermilab
The heart of the H- ion source, disassembled for cleaning.
And this is a picture of the inside of the dome. The bottle in the upper left is the hydrogen gas bottle; the complex equipment just to the right of center is the ion source, inside of which the above electrode sits.

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