Characteristics of Round and Extracted Strands of ${\hbox{Nb}}_{3}\hbox{Al}$ Rutherford Cable

Magnetization studies of RHQT-processed Nb3Al wires for high-field accelerator magnet applications

“…The main objective of developing the Ta-matrix wires was to reduce the low-field instability observed in conventional RHQT-processed Nb 3 Al wires [7,9]. Therefore, the magnetization of the Ta-matrix wires was examined in detail and compared to that of the Nb-matrix wires (ME451).…”

“…Therefore, it is believed that the effective filament diameter of RHQT-processed Nb 3 Al wire would be almost the same as that during the original fabrication. However, it has recently been found that conventional Nbmatrix wires exhibit rather strong magnetic instability at a low field [7,8] [9]. During the development, we measured the magnetization of the wires in addition to their critical current and critical temperature, in order to determine the nature of various superconducting phases in the wires and to study the magnetization characteristics of the wires.…”

Magnetization, Low Field Instability and Quench of RHQT ${\rm Nb}_{3}{\rm Al}$ Strands

“…The large magnetization extending beyond the critical field of Nb can be understood by the shielding current in the Nb 3 Al filaments. The interior of the conductor is kept at low field by this shielding current and the superconductivity of Nb matrix remains beyond 1T of the external field.…”

“…3) Simulation of Nb matrix Nb 3 Al Strand Comsol simulation of the whole Nb matrix F1 strand with 102 sub-elements together with Cu stabilizer is being investigated. The data with a rather small n-value of 3, for the faster convergence of calculation, are shown in Fig.…”

“…Their anomalous instabilities are due to the Nb matrix and partially because they did not have adequate twisting in their strands [5]. But with the use of the Ta matrix Nb 3 Al strand, we could successfully eliminate this low field instability for cable and magnet applications [1].…”