11 march 2012 holger witte brookhaven national laboratory advanced accelerator group a dipole...
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11 March 2012
Holger WitteBrookhaven National Laboratory
Advanced Accelerator Group
A Dipole (without)
Grain Oriented Steel
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21 March 2012
• Suggestion for a new dipole design
• Materials
• Simulation results– achievable fields– field quality
• Power loss
Overview
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31 March 2012
• Chosen to minimize magnetization losses– low coercivity – high saturation field – (in direction of grains)
• Challenges– measuring material properties– 1D material – not very forgiving in terms of geometrical
errors / material inhomogeneities – change of material properties over time / radiation exposure– Simulations – convergence problems
• Proposal: use different materials– FeCo (Hiperco 50A)– 6.5% silicon steel (JFE SuperCore)
Grain Oriented Steel
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41 March 2012
BH Curves
• Isotropic• FeCo: saturates
at higher B• 6.5SiFe:
developed for f>50Hz
• Limits: 1.1/2.1T• (GO Steel:
1.75T)
FeCo
6.5SiFe
GO Fe
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51 March 2012
New Dipole Design
• Combine both to benefit from respective advantages– Design yoke so that field
around 1.1-1.2T– Center yoke: FeCo
• Geometry: Don Summers EI yoke (‘first magnet’)
• Opera 3D• Looked at tapered and
non-tapered designs
6.5Si Steel FeCo
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61 March 2012
Geometry
22 mm
110 mm
100 mm
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71 March 2012
Magnetization
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81 March 2012
From D. Summers: Fast Ramping 750 GeV Muon Synchrotron Dipoles
Peak Field
d
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91 March 2012
Field Quality
• Evaluate vertical magnetic field on centre plane (y=0)– from -18 to 18 mm
• Fit polynom to field:
• Plot polynomial coefficients as function of peak magnetic field in centre
45 mm
...33
2210 xaxaxaaBy
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101 March 2012
Forbidden Multipoles
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111 March 2012
Sextupole
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121 March 2012
Sextupole
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131 March 2012
Decapole
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141 March 2012
JFE Super Core (0.1 mm sheet)
about 10W/kg
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151 March 2012
Hiperco 50A
About 20W/lb (44W/kg)
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161 March 2012
• FeCo (1 m long magnet)– average field 1.7T– mass: 45 kg – power loss: 2kW/m
• 6.5SiFe– average field: 1T– mass: 235 kg– power loss: 2.35 kW/m
• Assumes 400 Hz
Test Magnet
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171 March 2012
• Epstein frame test– JFE will provide samples for free (cut to size)– Hiperco 50A: identified supplier and company for
cutting/annealing, waiting for quotation• If successful: test magnet, geometry close to
Don’s 2nd magnet (later on: more life size model?)
• Magnet design for RCS ring?
Things to do
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181 March 2012
• FeCo + 6.5SiFe seems to be good combination– higher field than GO steel– better field quality?
• Conceptual design of test magnet• Material tests
Summary