We aim to build and test a Bi-2212 insert prototype coil designed by Princeton Plasma Physics Laboratory (PPPL) for the feasibility study of next step compact device such as compact stellarator or spherical tokamak (ST) ohmic heating central solenoid in a fusion pilot plant (FPP) beyond the present National Spherical Torus eXperiment Upgrade (NSTX-U). Low AC loss is critical for fast ramping...
This paper focusses on the AC loss of round multifilamentary superconductors over a wide frequency range, but with a focus on higher frequencies. We review the loss expressions for multifilamentary conductors and apply them to specific cases including several MgB2 conductors (some intended for low loss) as well as a Bi:2212 conductor. The different critical frequency regimes (bounded by fc1,...
Electrified aircraft are being developed to address climate change by reducing the fuel burn and emissions of aircraft. The large majority of aviation’s impact on the environment is caused by large transport aircraft, or those that can carry about 150+ passengers. At this scale, megawatt-class electrified propulsion systems are required. Superconducting and cryogenic electric machines are an...
Achieving sustainability in commercial aviation hinges on the transformation of large transport aircraft (>150 passengers), which are the principal contributors to aviation emissions. These 150+ passenger aircraft have powertrains with rated power in excess of 20 Megawatts. System studies have shown that the highest possible aircraft efficiencies can be obtained for fully superconducting...
High-current HTS cables made of stacked REBCO tapes are being considered for large superconducting magnet systems for fusion and other applications. AC losses are critical when analyzing a stack of non-insulated tapes. Using finite element software such as COMSOL, it is possible to model a 3D stack of non-insulated REBCO tapes and assess how AC losses vary, depending on factors such as the...
To achieve MW class high power-density aircraft propulsion motors, conductors with high ampacity but low overall losses are required. Aircraft powered by such motors are often designed to be zero or low emissions with the use of cryogenic fuel such as liquid hydrogen (LH2) or liquid natural gas (LNG). In this work we consider an operating point of 20 K, enabled by pool boiling LH2, which...
This study presents experimental measurements of the magnetization of ReBCO tape stack cables in magnetic fields up to 30 T at 4.2 K. The M-H response of these conductors is important for various applications, including particle accelerators, fusion reactors, and other emerging technologies. We employed a susceptibility technique, utilizing the NHMFL's Bitter magnet as the primary coil. A...
REBCO high-temperature superconductor are widely used in high magnetic field applications, due to their excellent critical current properties and high critical temperature. However, the width-to-thickness ratio of REBCO tapes is very large (typically in the range of 1000-10000) resulting in excessive power dissipation in the applications. One of the effective ways to reduce AC loss is to...
