Uncertainty of data obtained in SRF cavity vertical test
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Vertical test is a commonly used experimental method to qualify Superconducting Radio Frequency (SRF) cavities. Taking the experiences at Jefferson Lab (JLab) in US for example, over thousand of vertical tests have been performed on over 500 different cavities up to now [1]. Most of the tests at JLab followed the method as described in [1], but all the uncertainties of the calculated quality factors as well as the gradients were in-accurate due to the wrong algorithm used. In this paper, a first-principle method was applied to analyze the uncertainty of the data, and the results were compared with those in [1] under typical experiment conditions.
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Cryogenic tests on the MAGO cavity achieved 11 kHz electromagnetic mode splitting and high Q factors at 2 K, while mechanical Q factors fell below theoretical expectations.
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