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It definitely looks like a patch (or maybe stripe?) of something on the outside of that element. Possibly the same kind of green phosphor used in magic eye tubes or green CRTs?
For what it's worth (maybe nothing), the ion trap was originally not in that position. It was way back against the tube base and rotated about 30 degrees. Of course, someone might have monkeyed with it before, although the set doesn't show any obvious signs of tampering and the cover does have an AC interlock.
Phil Nelson
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