Speaker
Description
With a higher Tc and higher critical field Hc than Nb and many Nb compounds and alloys, MgB2 is anticipated to be a promising material to be used for superconducting RF (SRF) cavities at ~20 K. We report our continuing effort towards MgB2 coated SRF cavities. MgB2 films as thick as 5 um were coated on 1.3 GHz TESLA type Cu RF cavities by hybrid physical-chemical vapor deposition (HPCVD). The mock cavities were home-made by deep drawing. A pair of clamshell resistive heaters were employed to heat the cavity through conduction. Generations of Mg heaters were designed and tested. MgB2 films grown on 1 cm × 1 cm Cu substrates attached on the inside wall of cavities show Tc up to 34 K, measured by AC susceptibility [1]. Recent efforts of moving the Mg and B sources to coat MgB2 more uniformly and making RF surface resistance measurement are underway.
