Long length manufacturing of high performance BSCCO-2223 tape for the Detroit Edison Power Cable Project

Abstract-Phase development during the first few minutes of heat treatment of first generation (Bi Pb) 2 Sr 2 Ca 2 Cu 3 O y (Bi-2223) multifilamentary wires determines to a large extent the overall microstructure, the efficiency of primary phase development, competing secondary phase development, texture evolution, and grain-to-grain connectivity. It is shown that the filament structure of these wires can be described in terms of a shell model. The shell next to the silver sheath is comprised of well-formed Bi-2223 colonies grapho-epitaxially aligned to the silver sheath and only a few grains (average one colony) thick. Inside this shell is a less well-aligned, less phase pure, more porous Bi-2223 structure through which current is carried in a nonuniform manner as shown by MOI.

mentioning

confidence: 99%

A Shell Model for the Filament Structure of Bi-2223 Conductors

Holesinger

Kennison

Liao

et al. 2005

“…The floating coil of the Mini-RT device is operated in the temperature range of 20-40 K, and Bi-2223/Ag tape conductors were selected because of their high performance based on the recent technological progress [4], [5]. The nominal operation condition requires the total coil current of 50 kA, which is generated by 428 turns of solenoid windings using 420 m of an HTS tape.…”

Section: Engineering Features Of the Hts Floating Coilmentioning

confidence: 99%

Effective Resistance of the HTS Floating Coil of the Mini-RT Project

Yanagi

Mito

Hemmi

et al. 2005

Abstract-A magnetically levitated superconducting coil device, Mini-RT, has been constructed using high temperature superconductors for the purpose of examining a new magnetic confinement scheme of high-beta plasmas. The floating coil is wound with Bi-2223/Ag tapes, and it is operated in the temperature range of 20-40 K. The excitation tests of the coil were carried out and persistent current was sustained for magnetic levitation. The decay time constant of the persistent current was measured and the effective resistance of the coil cables was evaluated. The obtained resistance shows a considerable increase than that predicted by the n-value model. This might be caused by some electromagnetic effects such as the loss generation with long-lived shielding currents. This consideration was examined by measuring the magnetization of an HTS sample coil.

“…A Bi-2223 Ag-sheathed tape (reinforced with stainless steel foils) [5] is used with a total length of 12 m. A small winding machine was prepared, and the HTS tape was wound into a fiber-reinforced plastic (FRP) bobbin with an inner diameter of 77 mm. The inter-turn insulation was given by a Kapton tape, and Epoxy glue was used between turns to ensure mechanical rigidity.…”

Section: A Fabrication Of a Miniature Floating Coil For Fb-rtmentioning

confidence: 99%

Engineering research and development of magnetically levitated high-temperature superconducting coil system for mini-RT project

Yanagi

Morikawa

Mito

et al. 2002

Abstract-A magnetically levitated superconducting coil system is being developed using high temperature superconductors for examining a new magnetic confinement of high-beta plasmas. A miniature double-pancake coil was fabricated with a Bi-2223 Ag-sheathed tape for the purpose of developing a floating control using laser displacement gauges. The coil was inductively excited with liquid nitrogen cooling and successfully levitated in the air. A persistent current switch is also being developed with a Bi-2223 Ag-0.3wt%Mn-sheathed tape, and a prototype model was successfully tested.Index Terms-Bi-2223, high temperature superconductor, magnetic levitation, persistent current switch, plasma confinement.