Speaker
Prof.
Xiaoxing Xi
(Temple University)
Description
MgB2 is a promising superconductor to replace Nb for SRF cavities. Clean MgB2 thin films have a low residual resistivity (<0.1 µΩcm) and a high Tc of 40 K, promising a low BCS surface resistance. Its thermodynamic critical field Hc is higher than Nb, potentially leading to a higher maximum accelerating filed. The lower critical field Hc1 of MgB2 is lower than Nb, but it can be enhanced by decreasing the film thickness. MgB2 coated Cu cavities have an added advantage from the high thermal conductivity of Cu, which will enhance the heat transfer from the MgB2 layer, improving the cavity’s resistance to “quenching.” MgB2 coated Cu cavities working at 20 - 25 K will eliminate the need for liquid He refrigeration. I will present the latest results of our research on the coating of mock 3.9 GHz Cu cavity by hybrid physical-chemical vapor deposition (HPCVD). The materials issues involved in MgB2 thin films on Cu will also be discussed.
Primary author
Prof.
Xiaoxing Xi
(Temple University)
