Superconducting accelerating cavities made of Nb-coated copper were produced. Niobium films of a thickness ranging from 1.4 to 4 μm were deposited onto the inside of 3-GHz cavities and 500-MHz frequency by bias diode sputtering. A maximum accelerating field of 8.6 MV m−1 was reached without quench which is attributed to the large thermal conductivity of copper at liquid helium temperatures.
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Benvenuti et al. (1984) studied this question.
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