Difference between revisions of "Plan for mapping PS magnet"
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| − | [[image:18d36_field.png| | + | TOSCA simulation provided by S. Glamazdin. Field profile along the Z axis. Z = 0 cm is at the center of the magnet. |
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| + | [[image:18d36_field.png|550px]] | ||
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| + | Saturation | ||
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| + | [[image:18d36_satur.png|550px]] | ||
| + | |||
| + | |||
| + | [https://halldweb.jlab.org/beamline TOSCA simulation results] | ||
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| + | === 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 | ||
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| + | |||
| + | ''' 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 ? | ||
Latest revision as of 04:25, 1 April 2015
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 ?
