An MgB Superconducting Joint with its Own Heat-Treatment Schedule.

We suggested an MgB joint process with its own heat-treatment schedule to apply it for our 1.5-T MgB "finger" MRI magnet. In fabricating the MgB magnet, the optimal heat-treatment schedule to attain a reproducible and high critical current is different in a joint and a coil.

Hot-Spot Modeling of REBCO NI Pancake Coil: Analytical and Experimental Approaches.

The No-Insulation (NI) winding provides intrinsic bypassing current paths that enable self-protection from overheating. The self-protection of the NI coil is one of the most promising protection techniques for the high field high-temperature superconductor (HTS) magnet applications. Since the additional paths are valid for an HTS magnet with a thinner matrix, the self-protection mechanism is applicable even for the higher current density magnet with reduced matrix thickness inside the HTS tape.

Design Overview of the MIT 1.3-GHz LTS/HTS NMR Magnet with a New REBCO Insert.

We present a design overview of the MIT 1.3-GHz LTS/HTS NMR magnet (1.3G) with a newly designed 835-MHz REBCO insert (H835) as a replacement for the 800-MHz REBCO insert (H800) that was damaged when it quenched during operation in 2018.

Collapse of the metastable state in an attractive Bose-Einstein condensate.

The characteristic features of the collapse of the ground state in trapped one-component attractive Bose-Einstein condensates are studied by applying the catastrophe theory. From numerically obtained stable and unstable solutions of the Gross-Pitaevskii equation, we derive the catastrophe function defining the stability of the stationary points on the Gross-Pitaevskii energy functional. The bifurcation diagram and the universal scaling laws stemming from the catastrophe function show quantitative agreement with the numerical results.