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Physics > Accelerator Physics

arXiv:1804.04747 (physics)
[Submitted on 12 Apr 2018 (v1), last revised 8 Aug 2018 (this version, v2)]

Title:Improved RF Measurements of SRF Cavity Quality Factors

Authors:J.P. Holzbauer (1), C. Contreras (2), Y. Pischalnikov (1), D. Sergatskov (1), W. Schappert (1), ((1) Fermi National Accelerator Laboratory, (2) Facility for Rare Isotope Beams)
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Abstract:SRF cavity quality factors can be accurately measured using RF-power based techniques only when the cavity is very close to critically coupled. This limitation is from systematic errors driven by non-ideal RF components. When the cavity is not close to critically coupled, these systematic effects limit the accuracy of the measurements. The combination of the complex base-band envelopes of the cavity RF signals in combination with a trombone in the circuit allow the relative calibration of the RF signals to be extracted from the data and systematic effects to be characterized and suppressed. The improved calibration allows accurate measurements to be made over a much wider range of couplings. Demonstration of these techniques during testing of a single-spoke resonator with a coupling factor of near 7 will be presented, along with recommendations for application of these techniques.
Subjects: Accelerator Physics (physics.acc-ph)
Cite as: arXiv:1804.04747 [physics.acc-ph]
  (or arXiv:1804.04747v2 [physics.acc-ph] for this version)
  https://doi.org/10.48550/arXiv.1804.04747
Related DOI: https://doi.org/10.1016/j.nima.2018.09.155

Submission history

From: Jeremiah Holzbauer [view email]
[v1] Thu, 12 Apr 2018 23:22:05 UTC (336 KB)
[v2] Wed, 8 Aug 2018 03:48:29 UTC (414 KB)
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