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COOLSB2. Ramped superferric dipole magnet for NESR. Hanno Leibrock, GSI Darmstadt Kick-off meeting for EU Design Study "DIRACsecondary-Beams" for the FAIR project April 14-15, 2005. NESR in FAIR. FAIR Stage 1. versatile storage ring NESR. decelarated beams => ramped dipoles. Tasks. - PowerPoint PPT Presentation
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Ramped superferric dipole magnet for NESR
Hanno Leibrock, GSI Darmstadt
Kick-off meeting for EU Design Study
"DIRACsecondary-Beams" for the FAIR project
April 14-15, 2005
COOLSB2 COOLSB2
NESR in FAIR NESR in FAIR
FAIR Stage 1 versatile storage ring NESR
decelarated beams => ramped dipoles
TasksTasks
EU FP6 task COOLSB2:
superferric NESR-dipole for 1 T/s ramp rate
Subtasks:
Magnet layout, yoke design
Superconducting coil design
Cryostat design
=> functioning prototype magnet
Dipole ParametersDipole Parameters
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
Real gap height (heating) 90 mm
Field quality 110-4
NESR DipolesNESR Dipoles
challenges in red !
moderate field (<1.6 T), large aperture → superferric design
Because
allows large apertures since the flux is guided by the iron and the field quality is defined by the pole shape,
field enhancement by the iron,
low operation costs
Preliminary 2D - design Preliminary 2D - design (by C. Muehle)(by C. Muehle)
6000 A, 10 turns, 150 A/ mm2 (coil) curved (sagitta 69 mm)
Nuclotron cable
Field distributionField distribution
Field distributionField distribution
SC coil design: SC coil design: choice of the conductorchoice of the conductor
ramp rate 1 T/s → low inductance needed → cable
eddy currents in helium containment (bobbin) and cryostat
• → 'tube' forced-flow-cooling
• → 'non'-conducting cryostat
Nuclotron cable Rutherford cable CICC
Gantt diagram for Gantt diagram for R&DR&D with milestones with milestones
Milestones: Feasibility studies: December 31, 2005
Model cryostat delivered: June 30, 2006
Prototype dipole delivered: December 20, 2007
ConclusionsConclusions
moderate field (<1.6 T), large aperture → superferric design (low operation costs)
ramp rate 1 T/s → low inductance needed → cable
a preliminary magnet design exists
the design of the cryostat has to make sure that eddy current effects are negligible
planned prototype dipole delivery: december 2007
Die LeereDie Leere
Advantages of superconducting and Advantages of superconducting and resistive magnetsresistive magnets
superconducting resistive high current density → small coil size, small magnet size,
no Helium supply (refrigerator, supply lines, distribution boxes, feed-boxes)
zero resistance→ low operational costs, cheap amp-turns, low cost power supplies
no Helium containment, no (complicated) cryostats
high field magnets possible no quench detection / protection no water cooling necessary no R&D necessary cryogenic pumping
Formatiert: Kopfzeilenabstandvom Rand: 1,25 cm,Fußzeilenabstand vom Rand: 1,25 cm
Formatiert: Schriftart: 14 pt
Formatiert: Schriftart: 14 pt
Formatiert: Schriftart: 14 pt
Formatiert: Schriftart: 14 pt
Formatiert: Schriftart: 14 pt
Formatiert: Schriftart: 14 pt
Normal conducting CR-dipolesNormal conducting CR-dipoles
•Use of the same yoke for the normal conducting solution
•=> Problems:
•Purcel filter -> loss of ampere turns
•High flux density in yoke -> loss of ampere turns
•Small coil window -> high current density
•=> 465kW power loss per magnet
•Use of an appropriate (enlarged) yoke for the normal conducting solution
•No purcel filter, but enlarged pole
•Enlarged yoke for lower flux density
•Enlarged coil window
•=> approx. 200kW power loss per magnet
Investment costsInvestment costs
Costs for 24 dipoles Normal conducting CR-dipole
Superferric CR-dipole
Magnets: yoke
coil,cryostat, etc.
4880k€
2000k€
4880k€
5763k€
Cryogenics (feed boxes, transfer lines)
7% share of 7kW cryo plant
Conventional cooling
-
-
?k€
1800k€
1260k€
-
Power supply 1250k€ 180k€
Sum 8130k€+?k€ 13883k€
Operation costsOperation costs
Normal conducting CR-dip. Superferric CR-dipole
Losses at 4.5K (magnets, feed boxes, transfer)
- 24x19W=456Wcryo
El. power losses 24x465kW=11160kW 456Wcryox250W/Wcryo=114kW
Operation costs
for 20a with 6000h/a and 80% operation of CR and 9 c/kWh
96422k€
(with optimized nc-solution 200kW/magnet => up to 2x higher
investment:
41472k€)
984k€
Normal cond. quadrupole
El. power losses 26x66kW+18x58kW = 2760kW
Operation costs 23846k€
Superferric dipole in the A1900 FRS at MSU
Nuclotron dipoleNuclotron dipole at JINR in Dubna at JINR in Dubna
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