New method to measure the unloaded quality factor of superconducting cavities
Volker Ziemann
DOI 10.1103/PhysRevAccelBeams.27.032001 · Physical Review Accelerators and Beams
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Abstract
We describe a method that measures the unloaded quality factor Q0, the external quality factor QE, and the cavity detuning Δω with a recursive least-squares algorithm. It combines a large number of consecutive measurements to successively improve an estimate of fit parameters that asymptotically converges to the “real” values. Exploiting the large amount of data acquired by a digital low-level radio frequency system permits us to reach this asymptotic regime in a moderate time frame of seconds to minutes. Simulations show that the method works both for critically coupled and overcoupled cavities. A new calibration method addresses very tight tolerances of the method on system parameters.
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