First Results from Diamagnetic Loop Measurements of the DARHT-I Electron Beam [Slides]

Diamagnetic-loop (DML) measurements can inform efforts to improve radiographic resolution. DML is non-invasive, so time-resolved data is available on every shot while tuning or executing a hydrotest. The time-resolved beam size can be deduced from the DML data. LIA beam-transport dynamics affecting...

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Bibliographic Details
Main Authors: Smith, Horace Vernon, Broste, William B., Bender III, Howard Albert, Kallas, Nicholas Dimitrious, McCurdy, Kurtis, Moir, David C., Sanchez, Manolito, Salazar, Gary P., Ogg, Wade Curry, Ekdahl Jr., Carl August
Language:unknown
Published: 2023
Subjects:
43 PARTICLE ACCELERATORS
DML
Online Access:http://www.osti.gov/servlets/purl/1873324
https://www.osti.gov/biblio/1873324
https://doi.org/10.2172/1873324
Description
Summary:Diamagnetic-loop (DML) measurements can inform efforts to improve radiographic resolution. DML is non-invasive, so time-resolved data is available on every shot while tuning or executing a hydrotest. The time-resolved beam size can be deduced from the DML data. LIA beam-transport dynamics affecting beam size can be monitored while testing mitigation measures (e.g., beam halo suppression). Time-resolved beam size at final focus provides immediate information about spot size enlargement due to blur, and effectiveness of mitigation efforts. DML measures magnetic flux produced by a rotating beam, so it also enables monitoring of Larmor emittance that can enlarge the spot size. Beam rotation adds in quadrature with emittance, hence “Larmor emittance." Observing zero bias-field DML flux monitors beam rotation resulting from imperfect nulling of flux linking the cathode, and/or broken LIA transport symmetry (e.g., steering, quads, etc.).

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