{"id":{"repo_id":"cau-kiel","oai_identifier":"oai:macau.uni-kiel.de:macau_mods_00008591"},"canonical_url":"https://search.dev.ndltd.org/etd/cau-kiel/oai:macau.uni-kiel.de:macau_mods_00008591","repository":{"repo_id":"cau-kiel","name":"Christian-Albrechts Universität Kiel","base_url":"https://macau.uni-kiel.de/servlets/OAIDataProvider"},"display":{"title":"Dusty plasmas with high electron depletion","abstract":"Dusty plasmas with high electron depletion occur in a wide range of astrophysical and laboratory environments and constitute a strongly non-equilibrium plasma regime that is still not fully understood. In particular, the interaction of nanodust with the plasma, the resulting electron depletion, and the plasma description at high Havnes parameter remain open questions that require advanced diagnostic approaches. In this thesis, electron-depleted nanodusty laboratory plasmas are investigated experimentally using an extended set of optical and plasma diagnostics. The dust density wave diagnostic (DDW-D) is systematically applied to strongly electron-depleted plasmas. To overcome limitations of established light-based extinction diagnostics, new methods for dust size and density determination are developed. A neural-network-based evaluation of polarized light scattering (HERMiNe) accelerates particle size reconstruction compared to CRAS-Mie fitting while enabling a detailed uncertainty analysis. In addition, the video-aided extinction measurement (VAEM) removes the requirement of cylindrical symmetry and allows localized dust density perturbations to be resolved. To extend optical diagnostics into dense dust clouds, radiative transfer simulations are introduced to account for multi-scattering effects. An experimentally observed asymmetry in the angular distribution of multiply scattered photons is identified and explained, revealing a novel diagnostic signature accessible through spatially resolved polarimetry. The results of the conducted experiments indicate a transition from dust immersed in the plasma to a decoupled regime at high Havnes parameter. Furthermore, the normal distribution of particle sizes, with a small but mean-size-proportional width, shows a deviation from the commonly assumed monodisperse models. These findings demonstrate that strongly electron-depleted plasmas cannot be adequately described as simple two-component systems. Overall, this work establishes a robust experimental framework for the investigation of electron-depleted nanodusty plasmas and provides a basis for future studies.","abstract_html":"Dusty plasmas with high electron depletion occur in a wide range of astrophysical and laboratory environments and constitute a strongly non-equilibrium plasma regime that is still not fully understood. In particular, the interaction of nanodust with the plasma, the resulting electron depletion, and the plasma description at high Havnes parameter remain open questions that require advanced diagnostic approaches. In this thesis, electron-depleted nanodusty laboratory plasmas are investigated experimentally using an extended set of optical and plasma diagnostics. The dust density wave diagnostic (DDW-D) is systematically applied to strongly electron-depleted plasmas. To overcome limitations of established light-based extinction diagnostics, new methods for dust size and density determination are developed. A neural-network-based evaluation of polarized light scattering (HERMiNe) accelerates particle size reconstruction compared to CRAS-Mie fitting while enabling a detailed uncertainty analysis. In addition, the video-aided extinction measurement (VAEM) removes the requirement of cylindrical symmetry and allows localized dust density perturbations to be resolved. To extend optical diagnostics into dense dust clouds, radiative transfer simulations are introduced to account for multi-scattering effects. An experimentally observed asymmetry in the angular distribution of multiply scattered photons is identified and explained, revealing a novel diagnostic signature accessible through spatially resolved polarimetry. The results of the conducted experiments indicate a transition from dust immersed in the plasma to a decoupled regime at high Havnes parameter. Furthermore, the normal distribution of particle sizes, with a small but mean-size-proportional width, shows a deviation from the commonly assumed monodisperse models. These findings demonstrate that strongly electron-depleted plasmas cannot be adequately described as simple two-component systems. Overall, this work establishes a robust experimental framework for the investigation of electron-depleted nanodusty plasmas and provides a basis for future studies.","abstract_has_math":false,"creators":["Petersen, Andreas"],"institution":"Christian-Albrechts-Universität zu Kiel","degree_name":null,"degree_level":"thesis.doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Greiner, Franko","Beckers, Job"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2026,"date_issued":"2026-05-26","date_published":"2026-05-26","updated_at":"2026-07-24T01:35:26Z","subjects":["plasma","dust","nanodust","nanodusty","DDW","VAEM","Hermine","Havnes","electron depletion","Mie","polarization","CRAS","particle size","dust density","extinction","RTS","Polaris","Stokes"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://macau.uni-kiel.de/receive/macau_mods_00008591","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Greiner, Franko","Beckers, Job"]},{"key":"dc:creator","label":"Author","values":["Petersen, Andreas"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:publisher","label":"Institution","values":["Universitätsbibliothek Kiel"]},{"key":"dc:type","label":"Dc Type","values":["PhDThesis"]},{"key":"thesis:degree_level","label":"Degree Level","values":["thesis.doctoral"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Christian-Albrechts-Universität zu Kiel"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["plasma","dust","nanodust","nanodusty","DDW","VAEM","Hermine","Havnes","electron depletion","Mie","polarization","CRAS","particle size","dust density","extinction","RTS","Polaris","Stokes"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Dusty plasmas with high electron depletion occur in a wide range of astrophysical and laboratory environments and constitute a strongly non-equilibrium plasma regime that is still not fully understood. In particular, the interaction of nanodust with the plasma, the resulting electron depletion, and the plasma description at high Havnes parameter remain open questions that require advanced diagnostic approaches. In this thesis, electron-depleted nanodusty laboratory plasmas are investigated experimentally using an extended set of optical and plasma diagnostics. The dust density wave diagnostic (DDW-D) is systematically applied to strongly electron-depleted plasmas. To overcome limitations of established light-based extinction diagnostics, new methods for dust size and density determination are developed. A neural-network-based evaluation of polarized light scattering (HERMiNe) accelerates particle size reconstruction compared to CRAS-Mie fitting while enabling a detailed uncertainty analysis. In addition, the video-aided extinction measurement (VAEM) removes the requirement of cylindrical symmetry and allows localized dust density perturbations to be resolved. To extend optical diagnostics into dense dust clouds, radiative transfer simulations are introduced to account for multi-scattering effects. An experimentally observed asymmetry in the angular distribution of multiply scattered photons is identified and explained, revealing a novel diagnostic signature accessible through spatially resolved polarimetry. The results of the conducted experiments indicate a transition from dust immersed in the plasma to a decoupled regime at high Havnes parameter. Furthermore, the normal distribution of particle sizes, with a small but mean-size-proportional width, shows a deviation from the commonly assumed monodisperse models. These findings demonstrate that strongly electron-depleted plasmas cannot be adequately described as simple two-component systems. Overall, this work establishes a robust experimental framework for the investigation of electron-depleted nanodusty plasmas and provides a basis for future studies."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Dusty plasmas with high electron depletion"]}]}],"canonical_facts":{"dc:contributor":["Greiner, Franko","Beckers, Job"],"dc:creator":["Petersen, Andreas"],"dc:description.abstract":["Dusty plasmas with high electron depletion occur in a wide range of astrophysical and laboratory environments and constitute a strongly non-equilibrium plasma regime that is still not fully understood. In particular, the interaction of nanodust with the plasma, the resulting electron depletion, and the plasma description at high Havnes parameter remain open questions that require advanced diagnostic approaches. In this thesis, electron-depleted nanodusty laboratory plasmas are investigated experimentally using an extended set of optical and plasma diagnostics. The dust density wave diagnostic (DDW-D) is systematically applied to strongly electron-depleted plasmas. To overcome limitations of established light-based extinction diagnostics, new methods for dust size and density determination are developed. A neural-network-based evaluation of polarized light scattering (HERMiNe) accelerates particle size reconstruction compared to CRAS-Mie fitting while enabling a detailed uncertainty analysis. In addition, the video-aided extinction measurement (VAEM) removes the requirement of cylindrical symmetry and allows localized dust density perturbations to be resolved. To extend optical diagnostics into dense dust clouds, radiative transfer simulations are introduced to account for multi-scattering effects. An experimentally observed asymmetry in the angular distribution of multiply scattered photons is identified and explained, revealing a novel diagnostic signature accessible through spatially resolved polarimetry. The results of the conducted experiments indicate a transition from dust immersed in the plasma to a decoupled regime at high Havnes parameter. Furthermore, the normal distribution of particle sizes, with a small but mean-size-proportional width, shows a deviation from the commonly assumed monodisperse models. These findings demonstrate that strongly electron-depleted plasmas cannot be adequately described as simple two-component systems. Overall, this work establishes a robust experimental framework for the investigation of electron-depleted nanodusty plasmas and provides a basis for future studies."],"dc:format.medium":["application/pdf"],"dc:publisher":["Universitätsbibliothek Kiel"],"dc:subject":["plasma","dust","nanodust","nanodusty","DDW","VAEM","Hermine","Havnes","electron depletion","Mie","polarization","CRAS","particle size","dust density","extinction","RTS","Polaris","Stokes"],"dc:title":["Dusty plasmas with high electron depletion"],"dc:type":["PhDThesis"],"thesis:degree_level":["thesis.doctoral"],"thesis:institution_name":["Christian-Albrechts-Universität zu Kiel"]},"updated_at":"2026-07-24T01:35:26Z"}