On High the Power Handling Capability of Temperature Superconductive Filters

The experimental results presented for hybrid DWHTS filters demonstrate the capability of this type of filter to handle extremely high power levels (30-50 W) at 77 K. Typically, the current density on the resonator elements increases with the reduction of the filter bandwidth and with the increase of filter order. Nevertheless, a remarkable power handling capability has been demonstrated by the 8-pole 1 % bandwidth HTS filter considered in this paper. The problem of temperature rise inside HTS filters is addressed. The measured results presented indicate that a high power HTS filter may switch from a low thermal load to a considerably high thermal load as the HTS materials switch from the superconductive state to the nonsuperconductive state. The paper also presents theoretical results for the electromagnetic field distribution and temperature variation inside HTS filters. The software CAD tools described in this paper can be employed to optimize the thermal design of high power HTS filters.