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Preliminary Study of Possibility of HTS Use in ILC Extraction Quadrupole

Preliminary Study of Possibility of HTS Use in ILC Extraction Quadrupole. Ramesh Gupta Brookhaven National Laboratory. Why HTS Super-ferric Magnets?. This presentation is not intended to cover this topic.

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Preliminary Study of Possibility of HTS Use in ILC Extraction Quadrupole

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  1. Preliminary Study of Possibility of HTS Use in ILC Extraction Quadrupole Ramesh Gupta Brookhaven National Laboratory

  2. Why HTS Super-ferric Magnets? This presentation is not intended to cover this topic. Basically we are trying to find out if there is a region where HTS medium field magnets can be competitive in terms of “cost of ownership (capital + operation)” as compared to “water cooled copper magnets” and/or super-ferric magnets made with convention “Low Temperature Superconductors (LTS)”. HTS magnets offer several other benefits as well. • In case of RIA, HTS quadrupole for fragment separator region also turned out to be cheaper in cost as compared to water-cooled copper magnet. The original reason for choosing HTS was a better technical solution (higher gradient). • HTS quad operating at ~30 K was preferred over LTS to remove large energy (15 kW in first quad) economically at ~30 K rather than at ~4 K.

  3. Preliminary Investigation of HTS Quadrupole for ILC (QFEX4B-4E) • Design goals of this investigation: • Use 2nd generation HTS (YBCO). • Operate at 65 K or above (use sub-cool nitrogen or cryo-coolers). • Design with the conductor available today (improved performance would reduce conductor cost and coil size). • Warm iron compact design with low fringe field (seems to meet ILC spec). Revised 9 cm pole 40 cm outer radius HTS magnets would be more compact plus energy efficient as compared to water cooled magnets; and would allow larger temperature excursions as compared to LTS magnets. • Basic design parameters (as per slac-pub-1159, updated by C. Spencer): • Good field radius = 85 mm; Gradient ~11.8 T/m • Above quad is designed for a minimum pole radius = 90 mm; Gradient = 13+ T/m

  4. Preliminary Design Not good to go in machine, but good enough for proof-of-principle 9 cm minimum pole radius, 13 T/m Gradient, 40 cm yoke outer radius Gradient on axis (G/cm) Fringe field (G) on X-axis Jo = 50 A/mm2

  5. HTS Quadrupole For RIA Recently we completed a successful testing HTS R&D quadrupole for RIA (Rare Isotope Accelerator) The test also involved a 40+ minutes of stable operation at 30 K with a huge 25 W (5W/cm3 or 5MW/m3) heat load on coils.

  6. 77 K Performance of First and Second Generation HTS from ASC Conductor w = 4.35 mm t = 0.2 mm (2nd generation) 1st generation Higher Ic at 65 K 2nd generation HTS with nano-dots 1st generation Second generation HTS are new. Expect a significant improvement in performance and reduction in cost

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