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Initial laser-pulsed-power coupled experiments revealed that intense background radiation generated during 1 MA Zebra current shots overwhelmed laser-produced hard x-rays, obscuring radiographic images. Using combined spectral and spatial diagnostics, we identify energetic electrons accelerated by return currents as the dominant source of background hard x-rays, with electron energies inferred to be 3\u20134\u00a0MeV based on Monte Carlo simulations, and demonstrate mitigation through modifications to the radiation shielding and return-current configuration. The diagnostic platform was validated using a wire-pinch hard x-ray source, allowing radiographs of static 1-mm-diameter aluminum wires to be obtained while simultaneously measuring x-ray source spectra and spatial emission distributions within a single shot. Measured wire transmission profiles were quantitatively reconstructed using radiation transport simulations that incorporate an experimentally inferred two-temperature exponential x-ray spectrum from bremsstrahlung signal analysis and spatially distributed emission sources identified by pinhole imaging. Agreement between measured and simulated transmission profiles demonstrates the validity of the radiographic and x-ray source characterization approach, establishing this diagnostic platform as a promising tool for diagnosing magnetically driven, high-density plasmas relevant to warm dense matter and inertial fusion energy research.<\/jats:p>","DOI":"10.1063\/5.0320865","type":"journal-article","created":{"date-parts":[[2026,4,24]],"date-time":"2026-04-24T11:40:41Z","timestamp":1777030841000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Development of a broadband hard x-ray radiography platform for pulsed-power experiments"],"prefix":"10.1063","volume":"97","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7972-9894","authenticated-orcid":false,"given":"H.","family":"Sawada","sequence":"first","affiliation":[{"name":"Department of Physics, University of Nevada 1 , Reno, Nevada 89557-0220,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7251-0398","authenticated-orcid":false,"given":"L.","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Physics, University of California 2 , Merced, California 95343,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-7272-2327","authenticated-orcid":false,"given":"S.","family":"Gulihar","sequence":"additional","affiliation":[{"name":"Department of Physics, University of Nevada 1 , Reno, Nevada 89557-0220,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-0559-8031","authenticated-orcid":false,"given":"D.","family":"Gray","sequence":"additional","affiliation":[{"name":"Department of Physics, University of Nevada 1 , Reno, Nevada 89557-0220,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9135-8803","authenticated-orcid":false,"given":"B.","family":"Bauer","sequence":"additional","affiliation":[{"name":"Department of Physics, University of Nevada 1 , Reno, Nevada 89557-0220,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3765-3035","authenticated-orcid":false,"given":"V.","family":"Ivanov","sequence":"additional","affiliation":[{"name":"Department of Physics, University of Nevada 1 , Reno, Nevada 89557-0220,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2026,4,24]]},"reference":[{"issue":"3","key":"2026042407403664000_c1","doi-asserted-by":"publisher","first-page":"755","DOI":"10.1103\/revmodphys.78.755","volume":"78","year":"2006","journal-title":"Rev. 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