Plan for mapping PS magnet

TOSCA simulation provided by S. Glamazdin. Field profile along the Z axis. Z = 0 cm is at the center of the magnet.

Saturation

TOSCA simulation results

Mapping Requirements

Coordinate system

• The origin (0,0,0) is the geometric center of the magnetic poles, located in the middle of the gap.

• Z axis is along the beam and points along the photon beam direction

• Y is vertical

• X is perpendicular to the beam points to the Hall D south wall

Mapping Regions

Downstream end of the magnet

• 0 cm < Z < 90 cm

(1st measure fringe field for the maximum Z range allowed by the mapper)

• -22 cm < X < 22 cm

• Z = -1 cm, 0 cm, 1 cm, (3 cm)

Upstream end of the magnet

• -90 cm < Z < 0 cm

• -5 cm < X < 5 cm

• Y = -1 cm, 0 cm, 1 cm, (3 cm)

Step size

• 1 cm in X and Z

Mapping Fields

• 1.8 T

• 1.9 T

• 1.5 T

• ( 1 T)

Mapping procedure

• Map the fild along the beamline for B = 1.8 T (Y = 0) and compare with TOSCA

• Make a 2-D map for various fields: B = 1.8 T, 1.9 T, 1.5 T (1 T?)

• Make a 2-D map for B = 1.8 T at Y = -1 cm and 1 cm. We'll decide whether a 3D map is needed for other fields when we get data

• Can we rotate 2 Hall probes to measure Bz and Bx ?