{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/66232"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/66232","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Ion Bunching at High Energies","abstract":"Light ions offer several advantages over an electron beam or lasers as the driver for pellet fusion. This research deals with demonstrating that the electrostatic space charge fields produced by a reflex triode can be used to extract, accelerate, focus and bunch ions onto a target. The source of ions used in this experiment was a preformed plasma produced by a hollow cathode discharge.","abstract_html":"Light ions offer several advantages over an electron beam or lasers as the driver for pellet fusion. This research deals with demonstrating that the electrostatic space charge fields produced by a reflex triode can be used to extract, accelerate, focus and bunch ions onto a target. The source of ions used in this experiment was a preformed plasma produced by a hollow cathode discharge.","abstract_has_math":false,"creators":["Johnson, Gary Burton"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Electrical Engineering","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-12-12T20:55:14Z","date_published":"2014-12-12T20:55:14Z","updated_at":"2026-07-22T22:25:55Z","subjects":["Physics, Fluid and Plasma","Energy"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8026531"],"render_values":[{"text":"(UMI)AAI8026531","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/66232","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Johnson, Gary Burton"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-12T20:55:14Z","10000-01-01","1980"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical 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":["Physics, Fluid and Plasma","Energy"]}]},{"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/2142/66232","(UMI)AAI8026531"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Light ions offer several advantages over an electron beam or lasers as the driver for pellet fusion. This research deals with demonstrating that the electrostatic space charge fields produced by a reflex triode can be used to extract, accelerate, focus and bunch ions onto a target. The source of ions used in this experiment was a preformed plasma produced by a hollow cathode discharge.","A Nereus e-beam accelerator, on loan from Sandia Laboratories, is used to drive the reflex triode. This produces a 35 ns electron beam pulse of 300 kV and 50 kA. One can show that an electrostatic space charge well will be set up on the far side of the transparent anode. Ions in this region will be accelerated downstream and due to the distribution in their velocities, a bunching of their arrival times at a point downstream will occur.","Negatively biased Faraday cup probes are used to measure the intensity, pulse width, and time-of-flight of the ion beam downstream. Time-of-flight data indicate that the ions are being accelerated to > 90% of the applied anode potential. Ion beam current densities of up to 160 A/cm('2) have been obtained yielding electron beam to ion beam conversion efficiencies of > 25%, and bunching factors of greater than four have been observed.","This research demonstrates the feasibility of using efficient electron beam machines to produce intense high energy ion beams. Possible applications include using the device as the driver for pellet fusion.","Made available in DSpace on 2014-12-12T20:55:14Z (GMT). No. of bitstreams: 1 8026531.pdf: 2177013 bytes, checksum: 7d84d4fe78cf33dec0ac52c4339f2a9b (MD5) Previous issue date: 1980","Embargo set by: Seth Robbins for item 66411 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","89 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1980."]},{"key":"dc:title","label":"Title","values":["Ion Bunching at High Energies"]}]}],"canonical_facts":{"dc:creator":["Johnson, Gary Burton"],"dc:date":["2014-12-12T20:55:14Z","10000-01-01","1980"],"dc:description":["Light ions offer several advantages over an electron beam or lasers as the driver for pellet fusion. This research deals with demonstrating that the electrostatic space charge fields produced by a reflex triode can be used to extract, accelerate, focus and bunch ions onto a target. The source of ions used in this experiment was a preformed plasma produced by a hollow cathode discharge.","A Nereus e-beam accelerator, on loan from Sandia Laboratories, is used to drive the reflex triode. This produces a 35 ns electron beam pulse of 300 kV and 50 kA. One can show that an electrostatic space charge well will be set up on the far side of the transparent anode. Ions in this region will be accelerated downstream and due to the distribution in their velocities, a bunching of their arrival times at a point downstream will occur.","Negatively biased Faraday cup probes are used to measure the intensity, pulse width, and time-of-flight of the ion beam downstream. Time-of-flight data indicate that the ions are being accelerated to > 90% of the applied anode potential. Ion beam current densities of up to 160 A/cm('2) have been obtained yielding electron beam to ion beam conversion efficiencies of > 25%, and bunching factors of greater than four have been observed.","This research demonstrates the feasibility of using efficient electron beam machines to produce intense high energy ion beams. Possible applications include using the device as the driver for pellet fusion.","Made available in DSpace on 2014-12-12T20:55:14Z (GMT). No. of bitstreams: 1 8026531.pdf: 2177013 bytes, checksum: 7d84d4fe78cf33dec0ac52c4339f2a9b (MD5) Previous issue date: 1980","Embargo set by: Seth Robbins for item 66411 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","89 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1980."],"dc:identifier":["http://hdl.handle.net/2142/66232","(UMI)AAI8026531"],"dc:language":["eng"],"dc:subject":["Physics, Fluid and Plasma","Energy"],"dc:title":["Ion Bunching at High Energies"],"dc:type":["text"],"thesis:degree_discipline":["Electrical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:55Z"}