I endearingly call it the "bug zapper"
, but I can't remember if anyone called it anything. It just seemed to "be there".
I commend whoever rigged it with the quasi "Jacob's ladder" effect. If it was an early sequential circuit for a "chasing" light effect, it was very fluid.
As I stated upthread earlier, this thing might have worked as a foreground miniature for, say, engineering. True, the "intermix tube" business didn't appear until the movies and there's nothing to suggest the "classic" Enterprise would have had anything like it, but had a director gotten an idea, well, who knows?