[BTeam] Chopper details

[Michael Tiefenback]

What I put into the bteam chat but am unsure it went anywhere:

Unless it was changed at some time long ago, since the thermionic gun days the rotation was counter-clockwise, and the slit order in time was B-A-C.

I have not been involved in chopper setup in decades.  The RF system systematically is set up so that adding phase is the same as adding cable between source and cavity: positive PSET means RF arrives later.  In such a system, adding 90 degrees to one channel will result in a straight line.  The question of circular rotation is answered by which orientation the straight line ends up.  Either 1:30 to 7:30 or 4:30 to 10:30.  Clean answer.

Michael
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