Expert’s Guide to the Time Zero.
III. Time Zero Geometry
A. for PR01
The geometry of Phobos is such. The y-axis points up away from the center of the Earth. The x-axis is pointing out from the center of the RHIC ring. This requires the z-axis to point in the clock-wise direction of the beam.
Dimensions of the Time Zero Stand with respect to the Cerenkov stand.
B. for PR03
For PR02, there are 10 T0 tubes on either side of the experiment. Dependent on the beam conditions there locations change.
| Beam Condition | P Side (Behind Ring...) | N Side (Behind Ring...) |
| Au-Au | 3 | 3 |
| d-Au | 2 | 3 |
| p-p | 2 | 1 |