Automatic Pole and Q-Value Extraction for RF Structures

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The experimental characterization of RF structures like accelerating cavities often demands for measuring resonant frequencies of Eigenmodes and corresponding (loaded) Q-values over a wide spectral range. A common procedure to determine the Q-values is the -3dB method, which works well for isolated poles, but may not be applicable directly in case of multiple poles residing in close proximity (e.g. for adjacent transverse modes differing by polarization). Although alternative methods may be used in such cases, this often comes at the expense of inherent systematic errors. We have developed an automation algorithm, which not only speeds up the measurement time significantly, ... continued below

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C. Potratz, H.-W. Glock, U. van Rienen, F. Marhauser September 1, 2011.

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The experimental characterization of RF structures like accelerating cavities often demands for measuring resonant frequencies of Eigenmodes and corresponding (loaded) Q-values over a wide spectral range. A common procedure to determine the Q-values is the -3dB method, which works well for isolated poles, but may not be applicable directly in case of multiple poles residing in close proximity (e.g. for adjacent transverse modes differing by polarization). Although alternative methods may be used in such cases, this often comes at the expense of inherent systematic errors. We have developed an automation algorithm, which not only speeds up the measurement time significantly, but is also able to extract Eigenfrequencies and Q-values both for well isolated and overlapping poles. At the same time the measurement accuracy may be improved as a major benefit. To utilize this procedure merely complex scattering parameters have to be recorded for the spectral range of interest. In this paper we present the proposed algorithm applied to experimental data recorded for superconducting higher-order-mode damped multi-cell cavities as an application of high importance.

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  • IPAC2011, 4-9 Sep 2011, San Sebastian, Spain

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  • Report No.: JLAB-ACP-11-1438
  • Report No.: DOE/OR/23177-1922
  • Grant Number: AC05-06OR23177
  • Office of Scientific & Technical Information Report Number: 1029374
  • Archival Resource Key: ark:/67531/metadc835995

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  • September 1, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 2:48 p.m.

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C. Potratz, H.-W. Glock, U. van Rienen, F. Marhauser. Automatic Pole and Q-Value Extraction for RF Structures, article, September 1, 2011; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc835995/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.