PowerPoint-Pr

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COOLSB2
Ramped superferric dipole magnet for NESR
Hanno Leibrock, GSI Darmstadt Midterm Review and
Annual Report meeting of the FAIR Design Study
"DIRACsecondary-Beams" December 07-08, 2006
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NESR in FAIR
versatile storage ring NESR
Topology of FAIR
decelerated beams gt ramped dipoles
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Dipole Parameters
NESR Dipoles
Numbers 24
Maximum field 1.6 T
Minimum field 0.06 T
Ramp rate 1 T/s
Maximum ?B 1.5 T
Bending radius 8.125 m
Deflection angle 15
Effective length 2.128 m
Useable gap width 250 mm
Useable gap hight 70 mm
Pole gap height (heating) 90 mm
Field quality ?1?10-4
moderate field (lt1.6 T), large aperture ? both a
superferric and a normal conducting H-Type design
with warm bore and laminated warm yoke are
reasonable
challenges in red !
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Tasks

• EU FP6 task COOLSB2
• superferric NESR-dipole, ramp rate 1 T/s
• Subtasks
• Magnet layout, yoke design
• Superconducting coil design
• Cryostat design
• gt functioning prototype magnet

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Yoke design 2DYoke design 3DSelection of the
cableCoil pack designCryostat design Vacuum
chamberCooling schemeQuench protection
Accomplished work
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Yoke design 2DYoke design 3DSelection of the
cableCoil pack designCryostat design Vacuum
chamberCooling schemeQuench protection
Accomplished work
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Yoke design 2DYoke design 3DSelection of the
cableCoil pack designCryostat design Vacuum
chamberCooling schemeQuench protection
Accomplished work
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Yoke design 2DYoke design 3DSelection of the
cableCoil pack designCryostat design Vacuum
chamberCooling schemeQuench protection
Accomplished work
ramp rate 1 T/s ? low inductance needed ? cable
Nuclotron cable
The magnet has been designed with 10 turns of
Nuclotron conductor per coil (max. 6000 A)
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Yoke design 2DYoke design 3DSelection of the
cableCoil pack designCryostat design Radial
bars Vacuum chamberCooling schemeQuench
protection
Accomplished work
Nuclotron is in a G11 matrix
with courtesy of ELYTT Energy S.L.
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Yoke design 2DYoke design 3DSelection of the
cableCoil pack designCryostat design Vacuum
chamberCooling schemeQuench protection
Accomplished work
with courtesy of ELYTT Energy S.L.
The design of the cryostat has to make sure that
eddy current effects are negligible. The
insulating insert reduces the eddy current losses
by a factor of 1000 (from a value of 530 W/m to
less than 0.5 W/m).
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Yoke design 2DYoke design 3DSelection of the
cableCoil pack designCryostat design Vacuum
chamberCooling schemeQuench protection
Accomplished work
with courtesy of ELYTT Energy S.L.
The chamber must be 0.5 mm thick to reduce eddy
currents to a acceptable limit. Therefore, it
requires ribs for withstanding the external
pressure gt less than 1 mm of decrease in chamber
height.
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Yoke design 2DYoke design 3DSelection of the
cableCoil pack designCryostat design Vacuum
chamberCooling schemeQuench protection
Accomplished work
Current and helium distribution for a NESR dipole
Powering and cooling scheme chosen for the NESR
dipole ring
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Yoke design 2DYoke design 3DSelection of the
cableCoil pack designCryostat design Vacuum
chamberCooling schemeQuench protection
Accomplished work
One power supply, 4 RT dumping resistors Maximum
voltage 450 V to ground Tmax 300K
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Gantt diagram for RD with milestones
former date of prototype delivery December 28,
2007
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Conclusion

• A lot of design work has been done for the
  superferric NESR dipole
• Baseline scheme (FBTR) normal conducting dipoles
  
• Further developments depend on a professional
  cost comparison between the NC and SC solution.
• The manufacturing of a SC prototype will not be
  finished in time. Therefore we propose to
  transfer the COOLSB2 fund to another EU FP6 task
• Depending on the cost study, we will design and
  build a NC or SC NESR prototype dipole with GSI
  funding