orbit correctors in d2 and q4 update j. rysti and e. todesco 1 4/11/2014
TRANSCRIPT
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Orbit Correctors in D2 and Q4 Update
J. Rysti and E. Todesco
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Requirements• Integrated field 4.5 Tm (dual 3 T & 1.5 m).• Multipoles below 10 units at all operational
fields and configurations. Apertures operated completely independently.
• Cross-talk problem.• Evolution of design parameters:
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Aperture: 105 mm 100 mm 105 mmBeam distance: 194 mm 194 mm 188 mm
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Solutions
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• H/V configuration.• Use FeCo alloys, which have high saturation
inductions.• Lower the maximum operational field so that
multipoles < 10 units (make longer magnets).
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FeCo alloys
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FeCo alloys
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• High saturation fields (~ 2.4 T).• Best performance: 49% Fe, 49% Co, 2% V.• Must be heat treated at around 900 °C.• Magnetic properties somewhat sensitive to
stress.• Low temperature data missing...• Never used for superconducting magnets
before.• Heat-treated FeCo materials cost ~ 80 €/kg.
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Collar thickness & FeCo vs. Fe
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16 mm collar thickness 25 mm collar thickness
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Multipoles
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Both apertures powered equally
Ref. radius =2/3 aperture
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Multipoles
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Multipoles in aper. 2, when aper. 1 is powered
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FeCo alloys
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• Heat-treated FeCo materials cost ~ 80 €/kg.• Entire yoke FeCo (using 100 €/kg) ~150 000 €.• FeCo not needed
everywhere => ~40 000 €.
• In the example on the right, multi-poles below 10 up to 2.7 T.
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Laminated iron/steel collars?• Make the ”floating collars” from iron.• Iron closer to the coils, stacking factor 0.5.• However, would cause saturation at lower
fields -> worse field quality (self-saturation).
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Mechanical study• 16 mm collars enough?
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Iron yoke in the magnetic simulation (3 kA, 2.6 T), no yoke in structural.
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To be done• More mechanical analysis.• Thermal properties.• 3D effects on field quality.
• Remarks:• If max. operational fields lowered from 3 T to
• 2.8 T => +10 cm to magnet length• 2.5 T => +30 cm to magnet length• 2 T => +75 cm to magnet length
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Extra slides
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