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An application of high T c Rare Earth-QMG material to ILC Final Doublet Masayuki KUMADA , NIRS

An application of high T c 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

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An application of high T c Rare Earth-QMG material to ILC Final Doublet Masayuki KUMADA , NIRS

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  1. 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 MDI workshop, Jan.5,2005, SLAC

  2. SINGLE CRYSTAL with of RE-QMG 1cm MDI workshop, Jan.5,2005, SLAC

  3. 30K 40K 50K Comparison of RE- QMG with latest high Tccable and standard superconducting cable Latest high Tc Standard SC cable New material Jc (A/mm2) MDI workshop, Jan.5,2005, SLAC

  4. - How to make a QMG coil - • Strong temperature dependence Slice cutting Ag sputtering wafer Spiral coil processed Precise machining MDI workshop, Jan.5,2005, SLAC

  5. cryostat Reduced pressure 94mmHg 77K I QMG current lead 電流I I Power supply 63K ＋ I I Coil magnet Cooling power：35W(longer than 8h) 77K→63K：45 minutes How to assemble a QMG magnet assembling 55mm diameter,7 turns 6 layers MDI workshop, Jan.5,2005, SLAC

  6. + － + － 5mm 5mm 10mm A very compact RE-QMG QuadrupoleA simple model for a final doublet 4０ｍｍ + QMG coil － + + － － + + － － + ２０ｍｍ Coil surface(2.2T) Median plane Note median plane is on the 45 degree plane MDI workshop, Jan.5,2005, SLAC

  7. Simple RE-QMG Quadrupole Model(see previous page) courtsy of Koji Takano(http://www.tomagnet.com) Jc=500 A/ mm2 Contour plot Field distribution Tesla G=120T/m r MDI workshop, Jan.5,2005, SLAC Jc=500A/mm2

  8. How much is the field gradient?Simple scaling rule • B of Toroidal coil: • B=m I/(4pr) • J =500 A/mm2,r=10mm, B=4T • Thick rectangular conductor: • factor 2 smaller. MDI workshop, Jan.5,2005, SLAC

  9. Summary • 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 into 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

  10. Acknowledgement • 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

  11. Comparison of Low temperature and existing high temperature superconducting material(appendix)provided by F.Kircher(Saclay) MDI workshop, Jan.5,2005, SLAC

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