It was a zone, but it wasn't a normal zone.
A heater was used to initiate a normal zone.
The experimental setup to measure the energy required such that the normal zone propagates and the normal zone propagation velocity in the longitudinal direction is described.
The high current density wire has the highest normal zone propagation velocity (NZPV).
The key parameter that quantifies the quenching process in superconductors is the normal zone propagation (NZP) velocity, which is defined as the speed at which the normal zone expands into the superconducting volume.
But analysis of their stability and quench was still old fashioned, based on normal zone determination, analysis of its appearance and propagation.
Some peculiarities of HTS make this traditional, quite impractical and inconvenient approach to consideration of HTS devices stability and quench development using normal zone origination and propagation analysis.
In this article, the normal zone propagation evolution of a short sample of Bi-2223/AgMg Bi-2223/AgMgture superconducting tape highbeen investemperatureapplying localized heat pulsuperconducting
In this case, HTSs are vulnerable because of the low normal zone propagation velocity (NZPV) thus HTS magnets are not self-protecting.
Although they were designed to be cryostable at 13.0 kA in saturated helium at 4.4 K, propagation of a normal zone has been observed several times at higher currents than 11.0 kA.
Purposes of this paper are to study on behaviors of normal zone and hot spot temperature of wires during quench detect/energy dump sequence and to find criteria for the stability and quench protection.
