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    Item type:Publication, Access status: with files ,
    A carrier-suppressing interferometer for ultra-low-noise amplitude- and phase-detection
    (2023)
    Springer, Louise
    ;
    Jacob, Arne
    This thesis introduces the application of the Carrier-Suppression Interferometer (CSI) method for precision phase-noise measurements at attosecond resolution in the field of particle accelerator control systems. Starting from the thorough investigation of crucial system components and their phase noise contribution, the CSI setup reported here outperforms conventional noise detection methods for accelerator controls by more than two orders of magnitude. Furthermore, setup resolution limits and calibration methods are discussed.
    Publicationtype: Doctoral Thesis
      224  143
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    Item type:Publication, Access status: without files ,
    Phase noise measurements for L-band applications at attosecond resolution
    (IEEE, 2022-04-28)
    Springer, Louise
    ;
    Ludwig, Frank
    ;
    Mavrič, Uroš
    ;
    Vasylyuk, Volodymyr
    ;
    Pryschelski, Heinrich
    The paper summarizes theoretical and technical limitations when applying Carrier-Suppression Interferometer (CSI) methods for precision phase-noise measurements at attosecond resolution. The CSI setup reported here, outperforms conventional down-mixing methods by more than two orders of magnitude. For phase noise measurements at 1.3GHz operation frequency a detection floor of L = -205 dBc=Hz and excellent time resolution of 10.76 as within an offset frequency range from 40Hz to 1MHz have been achieved without the usage of cross-correlation or power recycling techniques. Measurement setup resolution limits, calibration methods, and effects of transmission line group delays are reported. Phase shifters and attenuators in the CSI were identified as key components. Different phase shifter technologies based on passive switches, varactor diodes, and capacitors were investigated. The presented research can be used in future in combination with conventional receiver techniques and enhances the state of the art of phase noise measurements to attosecond resolution and above.
    Publicationtype: Journal Article
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