Conceptual design of a scalable multi-kton superconducting magnetized liquid Argon TPC

We discuss the possibility of new generation neutrino and astroparticle physics experiments exploiting a superconducting magnetized liquid Argon Time Projection Chamber (LAr TPC). The possibility to complement the features of the LAr TPC with those provided by a magnetic field has been considered in the past and has been shown to open new physics opportunities, in particular in the context of a neutrino factory. The experimental operation of a magnetized 10 lt LAr TPC prototype has been recently demonstrated. From basic proof of principle, the main challenge to be addressed is the possibility to magnetize a very large volume of Argon, corresponding to 10 kton or more, for future neutrino physics applications. In this paper we present one such conceptual design.Comment: 4 pages, 1 figure, invited talk at 7th International Workshop on Neutrino Factories and Superbeams (NUFACT05), LNF, Frascati (Rome

DEVELOPMENT OF HTS CONDUCTORS FOR ELECTRIC POWER APPLICATIONS

Second generation (2G) technologies to fabricate high-performance superconducting wires developed at the Oak Ridge National Laboratory (ORNL) were transferred to American Superconductor via this CRADA. In addition, co-development of technologies for over a decade was done to enable fabrication of commercial high-temperature superconducting (HTS) wires with high performance. The massive success of this CRADA has allowed American Superconductor Corporation (AMSC) to become a global leader in the fabrication of HTS wire and the technology is fully based on the Rolling Assisted Biaxially Textured Substrates (RABiTS) technology invented and developed at ORNL

A study of parameters that influence growth and stability of the (Bi sub 1 minus x Pb sub x ) sub 2 Sr sub 2 Ca sub 2 Cu sub 3 O sub y phase

The growth and stability of the (Bi{sub 1-x}Pb{sub x}){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y} (Bi-2223) phase contained in silver-sheathed wires has been investigated by a combination of x-ray diffraction, scanning electron microscopy, energy dispersive x-ray analysis, and transmission electron microscopy. Silver tubes loaded with Bi-2223 precursor powders were processed into filaments using established metallurgical techniques. The filaments were then heat-treated at selected temperatures (800 to 845{degrees}C) for a range of times (10 to 6000 min) in a 7.5% oxygen atmosphere. From these studies it has been possible to investigate the time-temperature-oxygen pressure domains wherein Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} (Bi-2212) + second phases transform to Bi-2223. Fractional conversion (Bi-2212) {yields} (Bi-2223) versus time data show good conformance to the kinetic model for a diffusion-controlled reaction at the interface between thin sheets and a fine powder or a fluid. Quenching experiments also reveal that the Bi-2223 phase is stable in a limited temperature interval between 810 and 830{degrees}C