Quote:
Originally Posted by Travellingwave
I have been reading the Bush service instructions and it mentions the need to tighten the locknuts after doing the screen centering , to prevent image moving about with focus adjustment. So overall sounds like some attention needed to the focus magnet
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Yes, I agree. As for my comment on the tube rotation, it's actually incorrect. The geometry of the field inside the focusing magnet is cylindrical, so the possible interaction between the ion trap magnet and the focusing magnet if they're too close together does not depend on the tube rotation. Such interaction is still a bad thing though, and it's easy to see that if the ion trap magnet is too close to the focusing magnet, the two will stick together. In short: the ion trap magnet should be close to the base of the tube, and typically not more than 1 cm away from it.