This is a significant handicap to daily operation. The importance of getting the proper beam trajectory across the septa was discussed in the last section on splitting stations. Having nominal positions and angles at the end of the beamlines is important to the Research Division in the same way that having a nominal position and angle in Transfer Hall is important to Main Control Room operators. The beam trajectories leaving the Accelerator Division enclosures are the initial conditions for the Research Division's beamline tuneup. When the Research Division gets the beam in the same place, they should be able to use the same power supply settings to guide the beam to the experimental targets.
Experimenters like to see the beam hit their targets in the same way all the time.
It is possible for the beam to leave Accelerator Division enclosures far enough off of the nominal positions that the targets cannot be hit at all. Quenching Research division cryogenic magnet strings is another potential result of poor Switchyard beam trajectories. Points A and B in Figure 17-2 represent magnet locations. The solid lines represent beam trajectory. The beam travels along on a flat trajectory until it gets to magnet A which bends the beam up by an angle j.