Minimum quench energy and normal zone propagation velocity in MgB2 superconducting tape

The quench characteristics of Cu–Ni sheathed MgB2 superconducting monofilament tape were studied experimentally. We have investigated the stabilities i.e. minimum quench energy (MQE), normal zone propagation velocity <f>vp</f> at 4.2 K. Sample tape was triggered a local normal zone with a heater. By measuring the MQE and <f>vp</f> of MgB2 tape, we derived the dependence of MQE and <f>vp</f> on transport current and magnetic field. In addition, minimum propagation current was also obtained from the transport current dependence of <f>vp</f>. [Copyright &y& Elsevier]