{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T16:06:53Z","timestamp":1785514013035,"version":"3.56.0"},"reference-count":11,"publisher":"AIP Publishing","issue":"7","funder":[{"DOI":"10.13039\/100006133","name":"Advanced Research Projects Agency - Energy","doi-asserted-by":"publisher","award":["DE- AR0001258"],"award-info":[{"award-number":["DE- AR0001258"]}],"id":[{"id":"10.13039\/100006133","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100006133","name":"Advanced Research Projects Agency - Energy","doi-asserted-by":"publisher","award":["DE-AR0001261"],"award-info":[{"award-number":["DE-AR0001261"]}],"id":[{"id":"10.13039\/100006133","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000015","name":"U.S. Department of Energy","doi-asserted-by":"publisher","award":["DE-FG02-ER54744"],"award-info":[{"award-number":["DE-FG02-ER54744"]}],"id":[{"id":"10.13039\/100000015","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2026,7,1]]},"abstract":"<jats:p>Absolute extreme ultraviolet (AXUV) diode arrays are widely used in fusion experiments for time-resolved measurements of plasma radiation. We report the first implementation of an AXUV-based analysis framework on the Wisconsin high-temperature superconducting axisymmetric mirror. A single, precisely calibrated 20-channel AXUV assembly measures line-integrated plasma emission with \u223c1cm of spatial accuracy across the mid-plane. The data were processed to obtain the plasma\u2019s statistical moments, yielding time-resolved measurements of the centroid displacement \u03a6(t) and effective radius R(t). From the joint covariance of these quantities, we define a macroscopic instability parameter \u03c7(t) that quantifies large-scale plasma evolution directly from AXUV observables. The parameter \u03c7 serves as a compact indicator of macroscopic plasma activity, decreasing with increasing end-plate bias and exhibiting strong anti-correlation with diamagnetic flux during confinement transitions. These results demonstrate that a single AXUV array can provide real-time assessment of macroscopic plasma dynamics, constituting the first demonstration of such capability in a magnetic mirror plasma. Future extensions to multiple arrays will further enhance spatial coverage and enable full-mode tracking in axisymmetric mirror configurations and related fusion devices.<\/jats:p>","DOI":"10.1063\/5.0316560","type":"journal-article","created":{"date-parts":[[2026,7,13]],"date-time":"2026-07-13T12:34:11Z","timestamp":1783946051000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["First implementation of absolute extreme ultraviolet (AXUV) diode-array-based analysis and macro-instability diagnostics on Wisconsin high-temperature superconducting axisymmetric mirror (WHAM)"],"prefix":"10.1063","volume":"97","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5645-4245","authenticated-orcid":false,"given":"K.","family":"Shih","sequence":"first","affiliation":[{"name":"Realta Fusion 1 , Madison, Wisconsin 53717,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0950-7321","authenticated-orcid":false,"given":"D.","family":"Endrizzi","sequence":"additional","affiliation":[{"name":"Realta Fusion 1 , Madison, Wisconsin 53717,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7566-2610","authenticated-orcid":false,"given":"D. 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