Speaker
Description
It is well understood that HTS conductors have low quench propagation velocities due to the high conductor specific heat with increased temperature. An HTS conductor with very little copper has a low value of the integral of j2dt between the magnet operating temperature and 300 K. Adding copper to an HTS conductor reduces the quench velocity within the coil and it makes the coil thicker, but it increases the integral of j2dt between the operating temperature and 300 K. The extra copper makes the quench harder to detect. A method that can work in some coil configurations such as thin solenoids, involves turning a large portion of the HTS coil conductor normal by putting a large current pulse into a thin coil via a center tap. This method has been used with success in a large high-current-density two-layer LTS magnet. This method is more effective if the coil has a well-coupled shorted secondary winding
