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ST273 - Investigation of Twisted Stacked-tape Cable Conductor

M. Takayasu1, J.V. Minervini1, L. Bromberg1, M.K. Rudziak2, and T. Wong2
1MIT Plasma Science and Fusion Center, Cambridge, MA 02420, U.S.A. 
2Supercon, Inc., Shrewsbury, MA 01545, U.S.A.
Abstract - A cable fabrication method of a twisted stacked tape conductor for HTS YBCO tapes has been developed and tested. A 2 m long, 32-tape conductor of 4 mm width YBCO was fabricated with a 200 mm twist pitch. The measured critical current of the straight cable agreed with the expected values estimated from the self-magnetic field. The 2 m long cable wound on a surface of 0.5 m diameter circle did not show any degradations. It has been confirmed through tests with single tape and cable tests that it is possible to develop a YBCO multiple-tape stacked cable with a 200 mm twist pitch and to make a coil with an innermost turn of at least 0.5 m diameter. A joint method for a multi-tape YBCO cable using BSCCO tapes has been developed and operated at 2.2 kA. AC losses of a twisted stacked YBCO tape cable also have been analyzed. The twisted stacked-tape cabling method for YBCO tapes will be very useful for high-current, high-field magnets for various applications.
Keywords: Cabling, critical current, AC loss, HTS, termination, joint.
Submitted to ESNF July 31, 2011; accepted August 16, 2011. Reference No. 273, Category 5
Published in AIP Conference Proceedings 1435, 273-280 (2011)