Abstract
The extremely high Q of superconducting microwave cavities makes them very attractive for use in many applications. In some of these applications the resonant frequency of the superconducting cavity must be adjustable while the cavity is at liquid-helium temperatures. Because of the requirement that the losses in the tuning mechanism be very low, in order that the Q of the cavity not be degraded, the usual methods of tuning microwave cavities are not always applicable to superconducting devices. One example of a case in which new techniques have had to be developed is the superconducting linear accelerator which is being constructed at Stanford University. In this accelerator, 25 superconducting sections, each 20 ft long, will have to resonate at the same frequency to within about 1 part in 108. The sections are being constructed to be tunable at liquid-helium temperatures over a range of 1 part in 104, with a resolution of 1 part in 104.
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