{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/85924"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/85924","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Bombardment of Thin Lithium Films With Energetic Plasma Flows","abstract":"Here, we present experimental verification of substantially reduced target surface temperature with the use of thin lithium films on surface of the target as compared to a bare target. Furthermore, optical measurements are made to determine the density and temperature of the lithium vapor cloud as it expands away from the target surface. A collisional-radiative model for both neutrals and singly ionized lithium is used to model the lithium vapor and is found to correlate well with the optical measurements. The vapor cloud electron temperature is found to vary from 2--3 eV with peak heating occurring 3--5 mm away from the target. While the lithium neutral density is found to fall off exponentially from the surface, the lithium ion density is peaked 5--10 mm away from the target. This suggests an ionization front at this distance from the target where the energy from the incident plasma is primarily absorbed by the lithium vapor. It is estimated that the primary mechanisms for energy deposition into the lithium vapor are due to primary and secondary ionizations of the lithium as well as electron-lithium scattering. The energy absorbed by these processes correlates well with the energy reduction found to the target surface when a lithium coating is present.","abstract_html":"Here, we present experimental verification of substantially reduced target surface temperature with the use of thin lithium films on surface of the target as compared to a bare target. Furthermore, optical measurements are made to determine the density and temperature of the lithium vapor cloud as it expands away from the target surface. A collisional-radiative model for both neutrals and singly ionized lithium is used to model the lithium vapor and is found to correlate well with the optical measurements. The vapor cloud electron temperature is found to vary from 2--3 eV with peak heating occurring 3--5 mm away from the target. While the lithium neutral density is found to fall off exponentially from the surface, the lithium ion density is peaked 5--10 mm away from the target. This suggests an ionization front at this distance from the target where the energy from the incident plasma is primarily absorbed by the lithium vapor. It is estimated that the primary mechanisms for energy deposition into the lithium vapor are due to primary and secondary ionizations of the lithium as well as electron-lithium scattering. The energy absorbed by these processes correlates well with the energy reduction found to the target surface when a lithium coating is present.","abstract_has_math":false,"creators":["Gray, Travis Kelly"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Nuclear Engineering","degree_department":null,"school":null,"contributors":["Ruzic, David N."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-28T14:51:11Z","date_published":"2015-09-28T14:51:11Z","updated_at":"2026-07-22T22:26:26Z","subjects":["Engineering, Nuclear"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3392026"],"render_values":[{"text":"(MiAaPQ)AAI3392026","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/85924","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Ruzic, David N."]},{"key":"dc:creator","label":"Author","values":["Gray, Travis Kelly"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-28T14:51:11Z","10000-01-01","2009"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Nuclear Engineering"]},{"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, Nuclear"]}]},{"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/2142/85924","(MiAaPQ)AAI3392026"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Here, we present experimental verification of substantially reduced target surface temperature with the use of thin lithium films on surface of the target as compared to a bare target. Furthermore, optical measurements are made to determine the density and temperature of the lithium vapor cloud as it expands away from the target surface. A collisional-radiative model for both neutrals and singly ionized lithium is used to model the lithium vapor and is found to correlate well with the optical measurements. The vapor cloud electron temperature is found to vary from 2--3 eV with peak heating occurring 3--5 mm away from the target. While the lithium neutral density is found to fall off exponentially from the surface, the lithium ion density is peaked 5--10 mm away from the target. This suggests an ionization front at this distance from the target where the energy from the incident plasma is primarily absorbed by the lithium vapor. It is estimated that the primary mechanisms for energy deposition into the lithium vapor are due to primary and secondary ionizations of the lithium as well as electron-lithium scattering. 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Furthermore, optical measurements are made to determine the density and temperature of the lithium vapor cloud as it expands away from the target surface. A collisional-radiative model for both neutrals and singly ionized lithium is used to model the lithium vapor and is found to correlate well with the optical measurements. The vapor cloud electron temperature is found to vary from 2--3 eV with peak heating occurring 3--5 mm away from the target. While the lithium neutral density is found to fall off exponentially from the surface, the lithium ion density is peaked 5--10 mm away from the target. This suggests an ionization front at this distance from the target where the energy from the incident plasma is primarily absorbed by the lithium vapor. It is estimated that the primary mechanisms for energy deposition into the lithium vapor are due to primary and secondary ionizations of the lithium as well as electron-lithium scattering. 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