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HTS insert magnet design: Stack Cable Johnny Himbele, Arnaud Badel , Pascal Tixador

HTS insert magnet design: Stack Cable Johnny Himbele, Arnaud Badel , Pascal Tixador. Outline. Stack cable - Advantage / Drawback - Specification Prelimina r y HTS insert magnet design Next steps. S tack cable - Advantage - .

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HTS insert magnet design: Stack Cable Johnny Himbele, Arnaud Badel , Pascal Tixador

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  1. HTS insert magnet design:Stack CableJohnny Himbele, Arnaud Badel, Pascal Tixador

  2. Outline • Stackcable - Advantage/ Drawback - • Specification • Preliminary HTS insert magnet design • Nextsteps

  3. Stack cable - Advantage - Simple structure, Effective cost and Mechanical performance Easier to manufacture Twisting 50-tapes of YBCO stack cable for 50mm dipoleM.Takayasu (MIT),IEEE vol.23 No.3 2013

  4. Stack cable - Drawback - Ic distribution, Bending radius, Current sharing and Spatial issue Field on c-axis Space consuming 50-tapes of YBCO stack cable for 50mm dipoleM.Takayasu (MIT),IEEE vol.23 No.3 2013

  5. Specification • Clear bore aperture 40 mm • Flux density B1 5 T • Field quality 5*10-4 B1 • Current density 400 – 600 A/mm2 (20 T, 4,2K) • Mechanical stress 100 MPa • Operating current 5 – 10 kA • Cable transposition Twisted stacked & Roebel cable • Homogeneous current distribution

  6. Preliminary HTS insert magnet design Iron yoke J = 710 A/mm2 Iblock = 30 kA and Itape = 800 A (Ncond = 32 tapes) 8 mm 13 mm 5 T O 10 mm

  7. Preliminary HTS insert magnet design Iron yoke 8 mm • Space consuming • Field quality • Current distribution Twisting 8 mm Hard to twist 8 mm 13 mm 13 mm 13 mm 5 T O 10 mm

  8. Preliminary HTS insert magnet design Iron yoke 8 mm Square block-coil - Less space consuming - Less current in a block - Less field quality disturbance in coil head Twisting 4 - 5 mm 13 mm 5 T O 10 mm

  9. Preliminary HTS insert magnet design Hypothesis Iron yoke J = 710 A/mm2 Iblock = 5kA and Itape = 300 A (Ncond = 16 tapes) Easy to twist 5 T 4 mm O 4mm

  10. Next steps FOR BETTER HTS INSERT MAGNET DESIGN • Cable design: Cable width and thickness need to be same length (4 - 5 mm) to maintain a good field quality, to twist much easily and to have an effective space consuming at twisting part. The inhomogeneous Ic distribution is caused by twisting, therefore the twisting pitch is necessary to study. • Detection and protection: Find the reasonable operating current regarding protection scheme and additional materials. 6

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