History: Coordinate Systems

There are three coordinate systems used:

Lab Coordinates - Hall coordinate system where y goes against gravity, z is in the direction of the beam, and x is to the left when looking down the beam

Target Coordinates - Origin at the center of the target. x goes with gravity, z is parallel to the ground in the direction towards the center of the BigBite drift chambers or neutron arm?. y is to the left looking down z

Detector Coordinates - Origin specified by center of the first
plane of the drift chambers or neutron arm?. x is "down" in the dispersion direction, z is in the nominal direction of particles such that z = 0 is defined by the first plane of the chamber. y is defined so we have a right handed coordinate system.