| Magnet Unit(s) | 2202 |
|---|---|
| Typical BDES | < 0.28 kGm |
| Typical Current | <150 A |
| Typical PS Voltage | <10 V |
| Nominal Beta X | 90 m |
| Nominal Eta X | 0.27 m |
| Nominal Beta Y | 17 m |
| Nominal Eta Y | 0.003 m |
LER VCOR1L is a vertical steering magnet near the interaction point.
It is a little unusual that a steering magnet has an "LGPS" designation. For several of the steering magnets near the IP the LGPS designation comes from the fact that their steering function is combined with a modeled deflection. This is the case in LER IR2 for the VK2, HK1, and VCOR1 magnets.
This category of magnet has "dual database" where one magnet type (LGPS for the modeled bending) shares a physical magnet and power supply with another magnet type (XCOR or YCOR for steering). "Dual database" magnets have software complications outside the scope of this document.
For the VCOR1 magnets, the modeled bending arises from the fact that the LER beam traverses the BaBar solenoid field horizontally off axis. Since the solenoid fringe fields couple X offset into Y deflection, these two vertical dipoles are used to compenstate that vertical deflection.