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We report initial measurements of rippled reflecting shocks in epoxy using the Sakharov shock perturbation decay technique supported by analytical formulation from Miller and Ahrens [Rev. Mod. Phys. 63(4), 919 (1991)]. Experiments at the Jupiter Laser Facility employed drive beams delivering a 10\u00a0ns, 800\u00a0J pulse across an \u223c600\u00a0\u03bcm spot, launching a shock above 400\u00a0GPa into epoxy. The highly reflective shock in the epoxy sample was diagnosed using velocimetry and optical pyrometry. Velocimetry showed strong reflectivity and evidence of perturbation structure and streaked optical pyrometry clearly captured spatial evolution of the perturbed shock and showed amplitude growth, decay, and phase inversion, in agreement with hydrodynamic simulations using ARES. Our demonstration of technical viability and the observation of rippled reflecting shocks in epoxy establish a path toward future quantitative constraints on polymer rheology in HED experiments.<\/jats:p>","DOI":"10.1063\/5.0348956","type":"journal-article","created":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T12:40:04Z","timestamp":1791463204000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Measurements of ripple decay in reflecting shocks in epoxy under high energy density conditions"],"prefix":"10.1063","volume":"97","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6464-8039","authenticated-orcid":false,"given":"G.","family":"Righi","sequence":"first","affiliation":[{"name":"Lawrence Livermore National Laboratory 1 , Livermore, California 94550,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-9573-8878","authenticated-orcid":false,"given":"N.","family":"Kalantar","sequence":"additional","affiliation":[{"name":"University of Rochester 2 , Rochester, New York 14609,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1839-332X","authenticated-orcid":false,"given":"Y.-J.","family":"Kim","sequence":"additional","affiliation":[{"name":"Lawrence Livermore National Laboratory 1 , Livermore, California 94550,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1882-3702","authenticated-orcid":false,"given":"T. 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