Tensile Strain Dependence of Critical Current for RHQ-Nb3Al Wires

Details Tensile Strain Dependence of Critical Current for RHQ-Nb3Al Wires Tensile Strain Dependence of Critical Current for RHQ-Nb3Al Wires

2011-11-02

arxiv.org/abs/1111.0473v1

Physics

Condensed Matter

Superconductivity

4 pages

Scientific paper

KEK and NIMS have been jointly developing Nb3Al superconducting wire with a rapid heating and quenching (RHQ) method towards high field accelerator magnets in the Large Hadron Collider (LHC) luminosity upgrade. A15-type superconductors such as Nb3Al and Nb3Sn exhibit strain dependence with respect to their critical currents. Therefore, a thorough understanding of strain behavior is necessary for high field accelerator magnet development, which will be critical for the luminosity upgrade of the LHC. We recently started experimental studies on the strain dependence of all-Ta matrix and composite (Ta and Nb) matrix RHQ-Nb3Al wires extracted from Rutherford-type cables, whereby, critical currents Ic under longitudinal tensile strains were measured. No peak for Ic was observed with respect to the tensile strain in the two wires, and the reversible strain limit of Ic exceeded 200 MPa at 4.2 K for both samples. The reversible strain limit of the composite matrix wire was greater than that for the all-Ta matrix sample. Finally, the wires remained stable at stresses below 210 and 240 MPa and tensile strains below 0.25% and 0.30%, respectively.

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