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Mu2e / Offline

Offline software for the Mu2e experiment
Apache License 2.0
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13.62 degrees #1296

Open gaponenko opened 3 months ago

gaponenko commented 3 months ago

I noticed a hardcoded 

  aRotation.rotateY(-13.62*CLHEP::degree);

in Offline/GeneralUtilities/src/OrientationResolver.cc In a geometry description file Offline/Mu2eG4/geom/protonBeamDump_v03.txt we have

double         protonBeamDump.coreRotY = 13.72; // degrees

I am wondering if these two angles are different because one of them did not get updated. Or maybe they are not supposed to be identical and the current code is fine.

gaponenko commented 2 months ago

An update: the as-built drawings docdb-11669, C-SET_6-10-2-AB, show a 76.37850 angle between the walls of the TS hall and M4 beamline. This matches the 13.62 degree (90 - 76.37850 = 13.62150). OTOH the 13.72 degree angle is not explicit in the drawings.