# Plan for mapping PS magnet

From GlueXWiki

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

Saturation

### 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 ?