Superconducting Radio Frequency
Superconducting radio frequency (SRF) science and technology involves the application of electrical superconductors to radio frequency devices. The ultra-low electrical resistivity of a superconducting material allows an RF resonator to obtain an extremely high quality factor, Q. For example, it is commonplace for a 1.3 GHz niobium SRF resonant cavity at 1.8 Kelvin to obtain a quality factor of Q=5×1010. Such a very high Q resonator stores energy with very low loss and narrow bandwidth. These properties can be exploited for a variety of applications, including the construction of high-performance particle accelerator structures.
... The temperature of operation of an SRF cavity is typically selected as a minimization of wall-plug power for the entire SRF system ... The plot to the right then shows the pressure to which the helium vessel must be pumped to obtain the desired liquid helium temperature ...
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