scholarly journals Q-factor measurement of nonlinear superconducting resonators

2000 ◽  
Vol 36 (3) ◽  
pp. 271 ◽  
Author(s):  
X.S. Rao ◽  
C.K. Ong ◽  
Y.P. Feng
Keyword(s):  
Q Factor ◽  
Superconducting Resonators ◽  
Factor Measurement

scholarly journals Improvement of the Q-factor measurement in RF cavities

2012 ◽  
Author(s):  
Xu W. ◽  
S. Belomestnykh ◽  
I. Ben-Zvi ◽  
H. Hahn
Keyword(s):  
Q Factor ◽  
Rf Cavities ◽  
Factor Measurement

Superconducting Resonators: Decrease of Q-Factor at High Accelerating Field

2014 ◽  
Vol 9 (2) ◽  
pp. 22-35
Author(s):  
Aleksandr Dzyuba ◽  
Andrey Arzhannikov
Keyword(s):  
Radio Frequency ◽  
Research Methods ◽  
Q Factor ◽  
Chemical Research ◽  
Superconducting Resonators ◽  
Alternative Processing ◽  
Physico Chemical ◽  
Superconducting Radio Frequency ◽  
Processing Steps

Results combining efforts of different groups on investigation of losses in superconducting radio frequency cavities made of niobium are presented. Peculiarities of such losses and of their remedies are considered for dissipation at high accelerating voltages. The main results of RF tests as well as main experiments conducted via physico-chemical research methods on samples are discussed. The role of different type of defects on losses is presented. The candidate mechanisms for dissipation are considered based on exhibited results. As a conclusion the prediction is made on possible alternative processing steps for improvement of cost, time and safety efficiency of current technological procedures

A-posteriori Estimation of Random Uncertainty for the Reflection Type Q-factor Measurements

2020 ◽  
Vol 35 (10) ◽  
pp. 1105-1112
Author(s):  
Darko Kajfez
Keyword(s):  
Measurement Procedure ◽  
Q Factor ◽  
A Posteriori ◽  
Fitting Procedure ◽  
Uncertainty Estimates ◽  
Factor Measurement ◽  
Novel Method ◽  
Accuracy Of Results ◽  
Q Factors ◽  
Posteriori Estimation

A frequently used Q factor measurement procedure consists of determining the values of the input reflection coefficient vs. frequency with the use of a network analyzer, and processing the measured values with a data-fitting procedure to evaluate the location and the size of the corresponding Q-circle. That information is then used to compute the value of the loaded and unloaded Q factors and the coupling coefficient of the resonator being tested. This paper describes a novel method of post-processing the measured data, which also provides information on the uncertainty of the obtained results. Numerical examples show that this a-posteriori procedure can not only provide the uncertainty estimates but also improve the accuracy of results, even in the presence of a significant level of random measurement noise.

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