{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/80559"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/80559","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Electro-Mechanical Interactions in Superconducting Spoke -Loaded Cavities","abstract":"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.","abstract_html":"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.","abstract_has_math":false,"creators":["Conway, Zachary A."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Debevec, Paul T."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T20:03:04Z","date_published":"2015-09-25T20:03:04Z","updated_at":"2026-07-22T22:26:14Z","subjects":["Engineering, Electronics and Electrical"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3301121"],"render_values":[{"text":"(MiAaPQ)AAI3301121","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/80559","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Debevec, Paul T."]},{"key":"dc:creator","label":"Author","values":["Conway, Zachary A."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-25T20:03:04Z","10000-01-01","2007"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering, Electronics and Electrical"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/80559","(MiAaPQ)AAI3301121"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["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). 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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). 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