Transport properties of long-lengths of RHQT processed Nb/sub 3/Al conductor

Superconducting Property of<tex>$hboxNb_3(hboxAl,hboxGe)$</tex>Conductors Prepared by Diffusion Process

“…3shows core at 21 T, 4.2 K as a function of designed Al-Ge filament thickness for each reaction time at 1400 . The highest core in excess of 300 occurred when the filament thickness was 8 and the reaction time was 7 h. This value compares with a reported value of RHQT Nb Al at 21 T, 4.2 K[4].…”

“…Fig. 4 shows nonstabilizer characteristic of the Nb Al Ge sample, as a function of magnetic field, compared with RHQT Nb Al [4] and bronze-processed Nb [15]. The performance of the Nb Al Ge sample is greater than that of the RHQT Nb Al in magnetic fields over 21 T. conductor, compared with RHQT Nb Al [4] and bronze-processed Nb Sn [15].…”

“…Subsequently, a 10 h/800 heat treatment was performed. A cross-section of compared with RHQT Nb Al [4]. The sample was heat-treated at 1400 C for 7 h and subsequently at 800 C for 10 h. Before reaction, designed Al-25at%Ge filament diameter of the precursor is 4.08 m. Designed matrix ratio is 2.…”

“…Another favorable conductor is the so-called RHQT (rapidheated, quenched and transformed) Nb Al, in a point of view on both the good high-field characteristic and good strain tolerance [2]- [5]. Recent progress of achievement of piece-length in excess of 300 m provides an incentive to fabricate 1 GHz NMR magnets [4]. However, a problem arises in increasing the cross-sectional area.…”

Attempts to Enhance a Current Capacity by a RHQ Operation of Nb/Al Rectangular Strand

“…P RESENTLY rapid heating, quenching and transformation (RHQT)-Nb Al superconductor with Cu-clad stabilizer achieved a high critical current of 165.5 A at 23.5 T, 1.8 K and is expected to be a next generation conductor for high field magnet uses [1], [2]. Higher is, however, further required for use in an inner coil of 1 GHz nuclear magnet resonance (NMR) system.…”