Gun-Drilled Tube Type Nb3Sn with non-Cu Jc values over 3000 A/mm2 (12T-4.2K)

This proposal is submitted in response to the SBIR/STTR High Energy Physics Solicitation Topic 30(a). High-Field Superconductor and Superconducting Magnet Technologies for High Energy Particle Colliders, (a) High-Field Superconducting Wire Technologies for Magnets. The need is for strands that can operate in the 15/17T or higher regime, and have deff values of 30 m or less, with non-Cu Jc values at 3000 A/mm2 at 12T-4.2K or greater and 1500 A/mm2 at 15T- 4.2K or greater, and have stable operation throughout their operational fields. Strands close to these values are starting to be obtained, but the instability in the low field and defects due to cabling are issues to be solved. Hyper Tech has a desire to increase non-copper Jc at high field at 4.2K. We would like to see the achievement of non-Cu Jcs of over 3000 A/mm2 at 12T-4.2K for the Tube type strands with filament size of 30~35 m. The goal of this Phase I program is develop a tube type strand with target Jc values of over 3000 A/mm2 at 12T-4.2K, 1500-1800 A/mm2 at 15T-4.2 K, and deff values of 35 m. In order to do this, we intend to use an approach of using a gun drilled billet for restacking. This design will increase the utilization of the Nb in the billet and increase the reacted Nb3Sn area thereby increase the non-Cu Jc. The design will be able to be fabricated into a Rutherford cable without subelement breakage. Commercial applications and other benefits: Commercial Applications -The largest market for Nb3Sn is currently for accelerator and fusion magnets. The other commercial applications besides fusion and accelerators are high field 7-11T MRI, NMR systems, superconducting accelerators for protron radiation for cancer treatment, SMES, and high field magnetic separation