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STP454 - Advances in Overpressure Processing Bi-2212 Insert Coils in a New, Large Overpressure Furnace

Advances in Overpressure Processing Bi-2212 Insert Coils in a New, Large Overpressure Furnace
 
Eric Hellstrom, Matt Boebinger, Ernesto Bosque, Peng Chen, Anca-Monia Constantinescu, Daniel Davis, Lamar English, Erin Flagler, Ashley Francis, Arno Godeke, David Hilton, Jianyi Jiang, Fumitake Kametani, Hom Kandel, Youngjae Kim, David Larbalestier, Jun Lu, Maxime Matras, Justin Mcneely, George Miller, Steven Miller, Yavuz Oz, William Starch, Ulf Trociewitz
 
Applied Superconductivity Center, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
 
 
Abstract — The Overpressure (OP) processing Bi-2212 round wire increases Jc and Je in long-length wire to values needed for practical applications in high-field magnets.  In the past, OP processing of Bi-2212 coils was limited to small coils ~45 mm OD and ~25 cm long that could fit in the small, horizontal OP furnaces available at ASC and Fermi National Accelerator Laboratory.  We worked with a furnace company to build a larger, vertical OP furnace to process larger coils designed to be insert coils in high-field, all superconducting magnets.  The new furnace is designed with a working hot-zone that is 150 mm in diameter and 50 cm long, and for an OP pressure of 100 atm.  The challenges and lessons learned bringing this large OP furnace on line and results from larger diameter Bi-2212 coils OP processed in it will be discussed.

Keywords (Index Terms) — Bi-2212 high-temperature superconductors, overpressure processing, high field magnets, insert coils.

IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), July 2015.
Received July 20, 2015; Accepted July 28, 2015. Reference STP454; Category 2, 5. 
Invited presentation M3OrC-01 given at CEC-ICMC 2015; Tucson, USA, June 28 - July 02, 2015.