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Debevec, Paul T. Conway, Zachary A. 2015-09-25T20:03:04Z 2015-09-25T20:03:04Z 10000-01-01 2007 2007 This dissertation reports an investigation of the mechanical and electromagnetic properties of a beta = 0.4 double-spoke-loaded and a beta = 0.5 triple-spoke-loaded superconducting cavity at Argonne National Laboratory. These cavities are of interest in new heavy-ion and proton linear accelerators. We present a powerful method for characterizing arbitrary time-dependent Lorentz force induced detuning of superconducting cavities; the convolution of the Lorentz transfer function and the cavity accelerating gradient. Using the beta = 0.5 triple-spoke-loaded superconducting cavity the Lorentz transfer function is shown to accurately predict the cavity response to RF field pulses. We present experimental data characterizing the microphonic-noise of the beta = 0.4 double-spoke-loaded superconducting cavity and the subsequent design and testing of the beta = 0.5 triple-spoke-loaded superconducting cavity. The beta = 0.5 triple-spoke-loaded superconducting cavity rms microphonic-noise is less than 0.5 Hz, an improvement by an order of magnitude over the beta = 0.4 double-spoke-loaded superconducting cavity. Finally, electromechanical frequency and phase control methods to compensate the microphonic-noise of superconducting spoke-loaded cavities are presented. The techniques and methods developed here advance characterization and tuning techniques which are beneficial for all superconducting cavities and enable the use of spoke-loaded cavities in future accelerators. Made available in DSpace on 2015-09-25T20:03:04Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3301121.pdf: 2963030 bytes, checksum: f81aa85c1766a616a071a8152419fcb1 (MD5) Previous issue date: 2007 Embargo set by: Seth Robbins for item 81841 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 103 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007. http://hdl.handle.net/2142/80559 (MiAaPQ)AAI3301121 eng Engineering, Electronics and Electrical Electro-Mechanical Interactions in Superconducting Spoke -Loaded Cavities text University of Illinois at Urbana-Champaign Dissertation Ph.D. Physics Physics