Download - An application of high T c Rare Earth-QMG material to ILC Final Doublet Masayuki KUMADA , NIRS
MDI workshop, Jan.5,2005, SLAC
An application of high Tc
Rare Earth-QMG material to ILC Final Doublet
Masayuki KUMADA, NIRS Mitsuru MORITA, Nippon Steel Corporation
Introduction:
Motivation; to design the most compact SC Quadrupole magnet
Critical current density of Rare Earth QMG (Quench Melt and Growth) material is extremely high
Technology of processing of a coil made of a high Tc QMG crystal was developed at Nippon Steel corporation
Model QMG coil was made and tested.
Preliminary model of a Quadrupole suitable for ILC final doublet
Introduction:
Motivation; to design the most compact SC Quadrupole magnet
Critical current density of Rare Earth QMG (Quench Melt and Growth) material is extremely high
Technology of processing of a coil made of a high Tc QMG crystal was developed at Nippon Steel corporation
Model QMG coil was made and tested.
Preliminary model of a Quadrupole suitable for ILC final doublet
MDI workshop, Jan.5,2005, SLAC
SINGLE CRYSTAL with of RE-QMG
1cm
MDI workshop, Jan.5,2005, SLAC
10
100
1000
104
105
1 2 3 4 5 6 7 8 9
Jc(B)comparisonBi2212 4K parallel fieldNbTiNb3SnQMG77KQMG63KQMG4.2K
B(T)
30K
40K
50K
Jc
(A/mm2)
New material
Standard SC cable
Latest high Tc
Comparison of RE- QMG with latest high Tc
cable and standard superconducting cable
Comparison of RE- QMG with latest high Tc
cable and standard superconducting cable
MDI workshop, Jan.5,2005, SLAC
- How to make a QMG coil -- How to make a QMG coil -
Strong temperature dependence Strong temperature dependence
Ag sputtering
Precise machining
Slice cutting
Spiral coil processed
wafer
MDI workshop, Jan.5,2005, SLAC
How to assemble a QMG magnet How to assemble a QMG magnet
+
電流 II
I
II
Coil magnet
Power supply
cryostat
QMG current lead
77K
63K
Reduced pressure94mmHg
Cooling power: 35W(longer than 8h)77K→63K: 45 minutes
assembling
55mm diameter,7 turns6 layers
MDI workshop, Jan.5,2005, SLAC
A very compact RE-QMG QuadrupoleA simple model for a final doublet
A very compact RE-QMG QuadrupoleA simple model for a final doublet
5mm
10mm
5mm
QMG coil
Median planeCoil surface(2.2T)
20mm
+
--
--
- +
+
+
-
-
+
+
++
Note median plane is on the 45 degree plane
4 0mm
MDI workshop, Jan.5,2005, SLAC
Simple RE-QMG Quadrupole Model(see previous page) courtsy of Koji Takano
(http://www.tomagnet.com)
Simple RE-QMG Quadrupole Model(see previous page) courtsy of Koji Takano
(http://www.tomagnet.com)
磁場計算
0
0.2
0.4
0.6
0.8
1
1.2
0 5 10 15
mm
tesl
a
1系列
Field distributionContour plot
r
Tesla
G=120T/m
Jc=500 A/ mm2
MDI workshop, Jan.5,2005, SLAC
How much is the field gradient?Simple scaling rule
How much is the field gradient?Simple scaling rule
B of Toroidal coil: B= I/(4r) J =500 A/mm2,r=10mm, B=4T
Thick rectangular conductor: factor 2 smaller.
B of Toroidal coil: B= I/(4r) J =500 A/mm2,r=10mm, B=4T
Thick rectangular conductor: factor 2 smaller.
MDI workshop, Jan.5,2005, SLAC
SummarySummary Jc of RE-QMG coil could be as high as 5kA/mm2
Jc greater than any other existing materials. Better for winding in an application of small curvatures i
nto small coils. Can make the most compact quad with required gradient
with this material (could be smaller than the BNL “compact SC”)
RE-QMG behaves better under high external solenoid field of the detector than standard S-C or high Tccable.
Jc of RE-QMG coil could be as high as 5kA/mm2
Jc greater than any other existing materials. Better for winding in an application of small curvatures i
nto small coils. Can make the most compact quad with required gradient
with this material (could be smaller than the BNL “compact SC”)
RE-QMG behaves better under high external solenoid field of the detector than standard S-C or high Tccable.
MDI workshop, Jan.5,2005, SLAC
AcknowledgementAcknowledgement
Thanks to:
K.Takano(Takano Original Magnet Inc.) E.Antokhin(JST/BINP) F.Kircher(Saclay) Y.Iwashita (Kyoto University) C.Spencer(SLAC)
Thanks to:
K.Takano(Takano Original Magnet Inc.) E.Antokhin(JST/BINP) F.Kircher(Saclay) Y.Iwashita (Kyoto University) C.Spencer(SLAC)
MDI workshop, Jan.5,2005, SLAC
Comparison of Low temperature and existing high temperature superconducting material(appendix)
provided by F.Kircher(Saclay)
Comparison of Low temperature and existing high temperature superconducting material(appendix)
provided by F.Kircher(Saclay)
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