Jim Stewart wrote:
PS Richard - Has GlueX defined its coordinate system?Yes. The tagger hall origin is at the intersection of the nominal photon beam axis with the entrance surface of the crystal. The Hall D origin is at the intersection of the nominal photon beam axis with the plane coincident with the upstream surface of the first coil of the solenoid. The z axis points along the beam, the y axis points up, and the x axis is yhat cross zhat. These were hashed out around the year 2001, as I recall. Richard Jones |