The PEP-II Interaction Region with the BaBar Solenoid

In the spring of 1999, the BaBar detector rolled onto the beam line in the PEP-II[1] interaction region (IR). The presence of the detector solenoidal field significantly alters the behavior of the accelerator. Both beams, the high-energy beam (HEB) and the low-energy beam (LEB), are affected. The beams become coupled in the xy plane and the orbits are changed. We discuss these and other changes brought about by the solenoidal field of the Ba-Bar detector