{"id":3925,"date":"2025-09-25T15:46:28","date_gmt":"2025-09-25T13:46:28","guid":{"rendered":"https:\/\/x-ifu.irap.omp.eu\/?p=3925"},"modified":"2025-11-24T16:45:14","modified_gmt":"2025-11-24T14:45:14","slug":"wide-band-transmission-response-of-x-ifu-thermal-filters","status":"publish","type":"post","link":"https:\/\/x-ifu.irap.omp.eu\/en\/announcement\/wide-band-transmission-response-of-x-ifu-thermal-filters","title":{"rendered":"Wide band transmission response of X-IFU thermal filters"},"content":{"rendered":"\n<p>The paper titled&nbsp;<em>&#8220;Wide Band Transmission Response of the Filters for the X-IFU Detector of the Athena Observatory&#8221;<\/em>, presented at ICSO 2024, investigates the optical blocking filters used in the X-ray Integral Field Unit (X-IFU) aboard the Athena space observatory. These filters, composed of polyimide films coated with aluminum, are designed to block out-of-band radiation\u2014such as UV, optical, and IR light\u2014while allowing high transmission in the X-ray range (0.2\u201312 keV).&nbsp;The study evaluates 45 nm thick polyimide filters, either bare or coated with ~30 nm of aluminum, using multiple spectroscopy techniques over a broad spectral range, including X-ray, VUV, NUV-Vis-NIR, and IR.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure data-wp-context=\"{ &quot;core&quot;:\n\t\t\t\t{ &quot;image&quot;:\n\t\t\t\t\t{   &quot;imageLoaded&quot;: false,\n\t\t\t\t\t\t&quot;initialized&quot;: false,\n\t\t\t\t\t\t&quot;lightboxEnabled&quot;: false,\n\t\t\t\t\t\t&quot;hideAnimationEnabled&quot;: false,\n\t\t\t\t\t\t&quot;preloadInitialized&quot;: false,\n\t\t\t\t\t\t&quot;lightboxAnimation&quot;: &quot;zoom&quot;,\n\t\t\t\t\t\t&quot;imageUploadedSrc&quot;: 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srcset=\"https:\/\/x-ifu.irap.omp.eu\/wp-content\/uploads\/2025\/09\/Figure2.png 1700w, https:\/\/x-ifu.irap.omp.eu\/wp-content\/uploads\/2025\/09\/Figure2-300x298.png 300w, https:\/\/x-ifu.irap.omp.eu\/wp-content\/uploads\/2025\/09\/Figure2-1024x1016.png 1024w, https:\/\/x-ifu.irap.omp.eu\/wp-content\/uploads\/2025\/09\/Figure2-150x150.png 150w, https:\/\/x-ifu.irap.omp.eu\/wp-content\/uploads\/2025\/09\/Figure2-768x762.png 768w, https:\/\/x-ifu.irap.omp.eu\/wp-content\/uploads\/2025\/09\/Figure2-1536x1523.png 1536w, https:\/\/x-ifu.irap.omp.eu\/wp-content\/uploads\/2025\/09\/Figure2-12x12.png 12w\" sizes=\"(max-width: 1700px) 100vw, 1700px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\taria-label=\"Enlarge image\"\n\t\t\tdata-wp-on--click=\"actions.core.image.showLightbox\"\n\t\t\tdata-wp-style--right=\"context.core.image.imageButtonRight\"\n\t\t\tdata-wp-style--top=\"context.core.image.imageButtonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewBox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><figcaption class=\"wp-element-caption\"><em>(Figure taken from the scientific paper mentioned below)<\/em><\/figcaption>        <div data-wp-body=\"\" class=\"wp-lightbox-overlay zoom\"\n            data-wp-bind--role=\"selectors.core.image.roleAttribute\"\n            data-wp-bind--aria-label=\"selectors.core.image.dialogLabel\"\n            data-wp-class--initialized=\"context.core.image.initialized\"\n            data-wp-class--active=\"context.core.image.lightboxEnabled\"\n            data-wp-class--hideAnimationEnabled=\"context.core.image.hideAnimationEnabled\"\n            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<div class=\"lightbox-image-container\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full responsive-image\"><img decoding=\"async\" data-wp-bind--src=\"context.core.image.imageCurrentSrc\" data-wp-style--object-fit=\"selectors.core.image.lightboxObjectFit\" src=\"\" alt=\"\" class=\"wp-image-3926\"\/><figcaption class=\"wp-element-caption\"><em>(Figure taken from the scientific paper mentioned below)<\/em><\/figcaption><\/figure><\/div><\/div>\n                <div class=\"lightbox-image-container\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full enlarged-image\"><img decoding=\"async\" data-wp-bind--src=\"selectors.core.image.enlargedImgSrc\" data-wp-style--object-fit=\"selectors.core.image.lightboxObjectFit\" src=\"\" alt=\"\" class=\"wp-image-3926\"\/><figcaption class=\"wp-element-caption\"><em>(Figure taken from the scientific paper mentioned below)<\/em><\/figcaption><\/figure><\/div><\/div>\n                <div class=\"scrim\" style=\"background-color: #fff\" aria-hidden=\"true\"><\/div>\n        <\/div><\/figure><\/div>\n\n\n<p>Some of the&nbsp;experimental data were collected at leading facilities like BESSY II (Germany) and SOLEIL (France). Results showed that bare polyimide films are transparent in the soft X-ray region but transmit undesirable radiation at other wavelengths, while aluminum-coated filters significantly reduce this out-of-band transmission without compromising X-ray performance. Notably, strong absorption features were observed in the UV and visible range, with absorption edges related to the chemical elements involved in the materials evident between 73 eV and 1560 eV. This work marks the first comprehensive measurement of the full spectral response of the baseline X-IFU filters, providing essential input for filter design, detector calibration, and mission performance optimization. Further investigations are planned in the far-IR region to complete the filter characterization.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Scientific paper<\/h2>\n\n\n\n<ul>\n<li><strong><em>Wide-band transmission response of the filters for the X-IFU detector of the Athena Observatory<\/em><\/strong>, by Todaro M. et al., International Conference on Space Optics, Antibes &#8211; Juan les Pins, France, 24-25 octobre 2024. <strong>OA Link: <\/strong><a href=\"http:\/\/hdl.handle.net\/10447\/689553\">http:\/\/hdl.handle.net\/10447\/689553<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>The paper titled&nbsp;&#8220;Wide Band Transmission Response of the Filters for the X-IFU Detector of the Athena Observatory&#8221;, presented at ICSO [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":3936,"comment_status":"closed","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[5,7,46],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - 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