3. Superconductivity for radiofrequency cavities
Conventional (copper) and superconducting cavities operate on the same principle, but the heat dissipation and operating conditions are very different. Superconducting cavities are mainly made of solid niobium – or deposited on copper –, as we will see later in this article.
3.1 Radio-frequency superconductors: non-zero resistance!
The resistance of superconducting niobium is zero for a DC electric field, but not in the presence of a radio-frequency field; however, it is divided by a factor of around 100,000 compared with that of copper at room temperature. It is this enormous reduction in surface resistance that justifies the preferred use of superconducting niobium over copper in many particle gas pedals.
Because of their high surface...
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Superconductivity for radiofrequency cavities
Equipment for superconducting cavities
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