Difference between revisions of "Plan for mapping PS magnet"

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TOSCA simulation. Field profile along the Z axis. Z = 0 cm is at the center of the magnet.  
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TOSCA simulation provided by S. Glamazdin. Field profile along the Z axis. Z = 0 cm is at the center of the magnet.  
  
 
[[image:18d36_field.png|550px]]
 
[[image:18d36_field.png|550px]]
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[[image:18d36_satur.png|550px]]
 
[[image:18d36_satur.png|550px]]
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[https://halldweb.jlab.org/beamline TOSCA simulation results]
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=== Mapping Requirements ===
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''' Coordinate system '''
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* The origin (0,0,0) is the geometric center of the magnetic poles, located in the middle of the gap.
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* Z axis is along the beam and points along the photon beam direction
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* Y is vertical
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* X is perpendicular to the beam points to the Hall D south wall
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''' Mapping Regions '''
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'' Downstream end of the magnet ''
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* 0 cm < Z < 90 cm 
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(1st measure fringe field for the maximum Z range allowed by the mapper)
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* -22 cm < X < 22 cm
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* Z = -1 cm, 0 cm, 1 cm, (3 cm)
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'' Upstream end of the magnet ''
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*  -90  cm < Z < 0 cm
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*  -5 cm < X < 5 cm
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*  Y = -1 cm, 0 cm, 1 cm, (3 cm)
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''' Step size '''
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* 1 cm in X and Z
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''' Mapping Fields '''
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* 1.8 T
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* 1.9 T
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* 1.5 T
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* ( 1 T)
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''' Mapping procedure '''
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*  Map the fild along the beamline for B = 1.8 T (Y = 0) and compare with TOSCA
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*  Make a 2-D map for various fields: B = 1.8 T, 1.9 T,  1.5 T (1 T?)
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*  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
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*  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.

18d36 field.png

Saturation

18d36 satur.png


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 ?
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