The HRS magnet's are all superconducting and hence their coils must be maintained at cryogenic temperatures during operations. The LHe required by the magnets is supplied by the End Station Refrigerator, ESR.
All the HRS magnets cryogenic services are supplied through the overhead cryogenic lines. The distribution network begins at the distribution box over the pivot. This box is connected to the rest of the network via the flexible transfer lines over the pivot. The network is adjacent to the upstairs catwalk of the HRS.
Cryogenic information about each magnet is available on the control screens in the counting house, one for each magnet. Normally during run periods the control screens are sent upstairs to the Hall A counting house and information on all the HRS magnets is available on the HRS control screen located in the center of the main console. The control of all magnets is described in a following Subsection.
The power supplies for the magnets are located on the gantry balcony adjacent to the magnets. The supplies are all cooled with LCW.
The front panels of the power supplies are interlocked. Under no circumstances should the front panel of any supply be opened by anyone other than authorized personnel. There is a keyed electrical interlock located in the Hall A counting house main console to prevent the power supplies from being energized at inappropriate times. There are also signs posted listing the dangers of high magnetic fields.
The control interface for the power supplies is available through the HRS control screen in the Hall A counting house.