Fabrication, treatment and cryogenic testing of single-cell cavities made of forged ingot Nb

Abstract

We have successfully fabricated two 1.5 GHz single cell from forged ingot of residual resistivity ratio ~100.• Both cavities are processed with bulk EP, followed by 650 C/10 hrs annealing. • The rf performance of one of the cavity tested to this date is limited ~14 MV/m. Multipacting barrier was predicted at this gradient and it may be the likely the cause of quench.Oscillating superleak transducer (OST) sensors were used during rf measurements to detect the quench location and data are under review.