| Magnet Unit(s) | N/A |
|---|---|
| Typical Current | 4600 A |
| Typical PS Voltage | 6 V |
| Nominal Beta X | varies |
| Nominal Eta X | varies |
| Nominal Beta Y | varies |
| Nominal Eta Y | varies |
The BaBar solenoid is necessary for the detector particle tracking mechanism. Particles which decay near the interaction point traverse the BaBar detector with momentum component transverse to the detector axis. Charged particles traveling with such transverse momentum are deflected by the solenoid field, and the direction determines the sign of the charge while the amount determine the charge to momentum ratio.
The BaBar solenoid unfortunately complicates the HER and LER lattices. Compensation is implemented using skew quadrupoles.
The BaBar solenoid is a superconducting electromagnet whose coils live in a cryostat outside the barrel calorimeter. The cryostat has an inner radius of 1.4m, a length of 3.9m, and produces a 1.5T field.