{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/70903"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/70903","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Diagnosis of Inertial Confinement Fusion Implosions Using Analytic Models","abstract":"Embargo set by: Seth Robbins for item 71069 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","abstract_html":"Embargo set by: Seth Robbins for item 71069 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","abstract_has_math":false,"creators":["Welch, Dale Robert"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Nuclear Engineering","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-12-16T04:17:40Z","date_published":"2014-12-16T04:17:40Z","updated_at":"2026-07-22T22:26:03Z","subjects":["Engineering, Nuclear"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8600342"],"render_values":[{"text":"(UMI)AAI8600342","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/70903","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Welch, Dale Robert"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-16T04:17:40Z","10000-01-01","1985"]},{"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":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/70903","(UMI)AAI8600342"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Embargo set by: Seth Robbins for item 71069 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","210 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1985.","The continued progress of inertial-confinement fusion (ICF) is dependent on the diagnosis of the dense fusion plasma. The current information obtainable from ICF implosions is limited to average density-radius product ((,(rho))R) and temperature. Although some initial success has been made in cold targets using x-ray backlighting, the analysis of the target implosions with respect to stability, preheat, and shock-wave propagation in the fuel has not been possible. The understanding of these crucial issues is vital for the achievement of high fuel compression ratios and ultimately high fusion energy gain.","The detailed study of ICF implosions becomes feasible with the use of simple analytic models. The ability to analyze fusion-product spectra is greatly enhanced, making time-dependent and localized measurements of the target during implosion possible. In this thesis, implosion models are developed for both exploding pusher and ablative experiments, including the modeling of the global target temperature and density evolution and the localized behavior of shock waves and Rayleigh-Taylor instabilities. Using these models, the analysis of fusion-product spectra can yield a wealth of accurate implosion information.","The types of diagnostics investigated include the measurement of D(d,p)T reaction (DD) protons and the neutrons produced in the T(d,n)He-4 reaction (DT). The DD-proton spectra emerging from laser-fusion implosions were used to diagnose the target (rho)R and temperature at the time of peak fuel compression. In addition, the maximum ion temperature and fuel preheat caused by shock coalescence were determined and the effects of asymmetries were inferred.","A diagnostic of secondary neutrons produced in fast DT fusion reactions is first proposed. Using the ablative models, the evolution of the Rayleigh-Taylor instability can be measured from these high-energy neutrons in addition to the measurement of the fuel (,(rho))R at very high densities. This diagnostic should prove helpful in the diagnosis of upcoming high (,(rho))R ICF experiments.","Made available in DSpace on 2014-12-16T04:17:40Z (GMT). No. of bitstreams: 1 8600342.pdf: 5745936 bytes, checksum: 09668229de0faaf27960bdf92eec83a2 (MD5) Previous issue date: 1985"]},{"key":"dc:title","label":"Title","values":["Diagnosis of Inertial Confinement Fusion Implosions Using Analytic Models"]}]}],"canonical_facts":{"dc:creator":["Welch, Dale Robert"],"dc:date":["2014-12-16T04:17:40Z","10000-01-01","1985"],"dc:description":["Embargo set by: Seth Robbins for item 71069 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","210 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1985.","The continued progress of inertial-confinement fusion (ICF) is dependent on the diagnosis of the dense fusion plasma. The current information obtainable from ICF implosions is limited to average density-radius product ((,(rho))R) and temperature. Although some initial success has been made in cold targets using x-ray backlighting, the analysis of the target implosions with respect to stability, preheat, and shock-wave propagation in the fuel has not been possible. The understanding of these crucial issues is vital for the achievement of high fuel compression ratios and ultimately high fusion energy gain.","The detailed study of ICF implosions becomes feasible with the use of simple analytic models. The ability to analyze fusion-product spectra is greatly enhanced, making time-dependent and localized measurements of the target during implosion possible. In this thesis, implosion models are developed for both exploding pusher and ablative experiments, including the modeling of the global target temperature and density evolution and the localized behavior of shock waves and Rayleigh-Taylor instabilities. Using these models, the analysis of fusion-product spectra can yield a wealth of accurate implosion information.","The types of diagnostics investigated include the measurement of D(d,p)T reaction (DD) protons and the neutrons produced in the T(d,n)He-4 reaction (DT). The DD-proton spectra emerging from laser-fusion implosions were used to diagnose the target (rho)R and temperature at the time of peak fuel compression. In addition, the maximum ion temperature and fuel preheat caused by shock coalescence were determined and the effects of asymmetries were inferred.","A diagnostic of secondary neutrons produced in fast DT fusion reactions is first proposed. Using the ablative models, the evolution of the Rayleigh-Taylor instability can be measured from these high-energy neutrons in addition to the measurement of the fuel (,(rho))R at very high densities. This diagnostic should prove helpful in the diagnosis of upcoming high (,(rho))R ICF experiments.","Made available in DSpace on 2014-12-16T04:17:40Z (GMT). No. of bitstreams: 1 8600342.pdf: 5745936 bytes, checksum: 09668229de0faaf27960bdf92eec83a2 (MD5) Previous issue date: 1985"],"dc:identifier":["http://hdl.handle.net/2142/70903","(UMI)AAI8600342"],"dc:subject":["Engineering, Nuclear"],"dc:title":["Diagnosis of Inertial Confinement Fusion Implosions Using Analytic Models"],"dc:type":["text"],"thesis:degree_discipline":["Nuclear Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:03Z"}