{"id":{"repo_id":"unm","oai_identifier":"oai:digitalrepository.unm.edu:ne_etds-1035"},"canonical_url":"https://search.dev.ndltd.org/etd/unm/oai:digitalrepository.unm.edu:ne_etds-1035","repository":{"repo_id":"unm","name":"University of New Mexico","base_url":"https://digitalrepository.unm.edu/do/oai/"},"display":{"title":"Radiation Damage in Permanent Magnet Lenses","abstract":"Proton radiography techniques in use at Los Alamos National Lab and elsewhere depend upon permanent magnet quadrupoles in their magnetic optics. Radiation exposure during radiography experiments is known to damage these lenses and degrade image quality. This effect is studied under controlled conditions, leading to the conclusion that nonuniform radiation damage is inherent to the quadrupole configuration and results in increased multipole moments which degrade the imaging performance. Studies on magnet samples suggest that Samarium Cobalt is at least a thousand times more radiation-tolerant and should be used as a replacement for NdFeB in magnetic lenses for high-dose proton radiography.","abstract_html":"Proton radiography techniques in use at Los Alamos National Lab and elsewhere depend upon permanent magnet quadrupoles in their magnetic optics. Radiation exposure during radiography experiments is known to damage these lenses and degrade image quality. This effect is studied under controlled conditions, leading to the conclusion that nonuniform radiation damage is inherent to the quadrupole configuration and results in increased multipole moments which degrade the imaging performance. Studies on magnet samples suggest that Samarium Cobalt is at least a thousand times more radiation-tolerant and should be used as a replacement for NdFeB in magnetic lenses for high-dose proton radiography.","abstract_has_math":false,"creators":["Danly, Christopher"],"institution":null,"degree_name":"Nuclear Engineering","degree_level":"Thesis","degree_discipline":"Nuclear Engineering","degree_department":null,"school":null,"contributors":["Cooper, Gary","Prinja, Anil K.","Merrill, Frank","Rodriguez, Salvador"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-09-12T07:00:00Z","date_published":"2014-09-12T07:00:00Z","updated_at":"2026-07-24T05:26:35Z","subjects":["magnet","PMQ","radiography"],"languages":["English"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://digitalrepository.unm.edu/ne_etds/36"],"render_values":[{"text":"https://digitalrepository.unm.edu/ne_etds/36","href":"https://digitalrepository.unm.edu/ne_etds/36","code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/1928/24477","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Cooper, Gary","Prinja, Anil K.","Merrill, Frank","Rodriguez, Salvador"]},{"key":"dc:creator","label":"Author","values":["Danly, Christopher"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Nuclear Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis","Masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Nuclear Engineering"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["magnet","PMQ","radiography"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/1928/24477","https://digitalrepository.unm.edu/ne_etds/36"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Proton radiography techniques in use at Los Alamos National Lab and elsewhere depend upon permanent magnet quadrupoles in their magnetic optics. Radiation exposure during radiography experiments is known to damage these lenses and degrade image quality. This effect is studied under controlled conditions, leading to the conclusion that nonuniform radiation damage is inherent to the quadrupole configuration and results in increased multipole moments which degrade the imaging performance. Studies on magnet samples suggest that Samarium Cobalt is at least a thousand times more radiation-tolerant and should be used as a replacement for NdFeB in magnetic lenses for high-dose proton radiography."]},{"key":"dc:title","label":"Title","values":["Radiation Damage in Permanent Magnet Lenses"]}]}],"canonical_facts":{"dc:contributor":["Cooper, Gary","Prinja, Anil K.","Merrill, Frank","Rodriguez, Salvador"],"dc:creator":["Danly, Christopher"],"dc:description.abstract":["Proton radiography techniques in use at Los Alamos National Lab and elsewhere depend upon permanent magnet quadrupoles in their magnetic optics. Radiation exposure during radiography experiments is known to damage these lenses and degrade image quality. This effect is studied under controlled conditions, leading to the conclusion that nonuniform radiation damage is inherent to the quadrupole configuration and results in increased multipole moments which degrade the imaging performance. Studies on magnet samples suggest that Samarium Cobalt is at least a thousand times more radiation-tolerant and should be used as a replacement for NdFeB in magnetic lenses for high-dose proton radiography."],"dc:identifier":["http://hdl.handle.net/1928/24477","https://digitalrepository.unm.edu/ne_etds/36"],"dc:language":["English"],"dc:subject":["magnet","PMQ","radiography"],"dc:title":["Radiation Damage in Permanent Magnet Lenses"],"thesis:degree_discipline":["Nuclear Engineering"],"thesis:degree_level":["Thesis","Masters"],"thesis:degree_name":["Nuclear Engineering"]},"updated_at":"2026-07-24T05:26:35Z"}