gluex two magnet tagger g. yang university of glasgow part 1, 3 d tosca analysis. part 2,...
TRANSCRIPT
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GlueX Two Magnet Tagger
G. Yang University of Glasgow
Part 1, 3 D Tosca analysis. Part 2, Preliminary Drawings. Part 3, Proposed Assembly Procedures (i) Complete Tagger. (ii) Vacuum Chamber Tests.
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Software used : Opera 3D, version 8.010.
What we have calculated: • 2 D, 3 D magnetic field distributions.• The Effective field boundary along the magnet edge.• Electron trajectories calculated by using Opera 3D,
post processor.• Optical properties using a grouping of 9 electrons
trajectories.
Part 1 3 D Tosca analysis
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2 D magnetic field histogram calculated by TOSCA.
magnetic field along a line perpendicular to the magnet output edge.
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• Electron trajectories have been calculated using Opera 3 D post processor.
• By using the calculated electron trajectories, beam spot size, and focal plane position have been determined.
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Calculated electron trajectories
Beam trajectories calculated from TOSCA in the mid plane for 1 GeV and 9 GeV. Those trajectories having the same direction focus on position 1, and those trajectories having the same starting position focus on position 2. ( electrons travelling in the direction shown by the top arrow ).
Electron trajectory bundles according to their directions at the object position.
(1 GeV) (9 GeV)
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Other interesting results
The intersections of the beam trajectories with the plane through the focusing point and perpendicular to the beam ((a):1 GeV, (b): 9 GeV), the dotted lines show the beam spot profile.
(We have used a rectangular object shape. So, ideally we expect to obtain a rectangular image at the focal plane.)
(a) (b)
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• Preliminary drawings of the two identical magnet tagger system are shown. The magnet dimension used here are the same as used in the Tosca analysis.
• The drawings include the two magnets, a vacuum chamber.
• Assembly procedure are proposed.
Part 2 Preliminary drawings
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The two identical magnets tagger
Magnet 1
Magnet 2
Vacuum chamber
The vacuum force is around 70 tons, so the vacuum chamber needs external support
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The electron entrance angle :5.9 degrees
Main beam exit angle: 6.6 degrees
Main beam bending angle 13.4 degrees
The angle between the photon exit beam and the focal plane: 9.94 degrees
1
1
1
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• Length: 3.11 m.
• Width: 1.09 m.
• Height:1.41m.
• Weight: ~38 Tonns for one magnet.
• Conductor area: 84 cm2.
• Current: 154 A.
• Magnetic field:
1.5 T.
• Pole gap: 2 cm
1
Vertical section through one of the dipole magnets showing pole profile and coil geometry
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Vacuum chamber
1
1
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Vertical section showing how vacuum O-ring compression is determined
*
O-ring sealVacuum chamber
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Vertical section showing how coils are supported against magnetic forces (0.5 ton)
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Vertical section showing how weight of coils are supported (each coil ~0.4 ton)
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The brackets and spacers used in the tagger system
1 2
3 4
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Part 3. (i) Proposed Assembly procedure for complete tagger
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Part 3. (ii) Proposed Assembly procedure for vacuum chamber testing
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Conclusions
1. Optical properties meet design specification
2. Sufficient details is provided so that a realistic cost estimate of the tagger magnets and vacuum chamber can be obtained from potential manufactures.