Magnets

Particular care must be taken in working in the vicinity of the magnetic elements of the polarimeter as they can have large currents running in them. Only members of the Møller polarimeter group are authorized to work in their immediate vicinity, and only when they are not energized. The quadrupole magnets and the leads for the dipole magnet are protected with Plexiglas shields. As with all elements of the polarimeter which can affect the beamline, the magnets are controlled by MCC. There are four red lights which indicate the status of the magnets. The dipole has two lights which are activated via a magnetic field sensitive switch placed on the coils of the dipole. One light is placed on the floor on beam left, and the other is placed on the raised walkway on beam right. The quadrupoles have similarly placed lights (one on the floor on beam left and one on the walkway), and are lit up when any one of the Møller quads is energized. The status of the quadrupole power supplies is on the checklist for closing up Hall A. Lock and tag training is required of all personnel working in the vicinity of the Møller magnets.

The power supply for the dipole is located in the Beam Switch yard Building (Building 98). The maximum current for the dipole is 450A. The quadrupole power supplies are located in Hall A electronics rack 13, 2 supplies connected in parallel per one quadrupole. The maximum current per one power supply is 60A at about 20V.