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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 4 ALTRI PRODOTTI SCIENTIFICI (Other scientific products)
  4. 4.03 Rapporti di progetto
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/33910
DC FieldValueLanguage
dc.contributor.authorPUCCIO, ELENAen_US
dc.contributor.authorLO CICERO, UGOen_US
dc.contributor.authorBARBERA, Marcoen_US
dc.date.accessioned2023-02-27T11:12:54Z-
dc.date.available2023-02-27T11:12:54Z-
dc.date.issued2021en_US
dc.identifier.urihttp://hdl.handle.net/20.500.12386/33910-
dc.descriptionThe authors wish to thank Teresa Mineo, Fabio D’Anca, Philippe Peille for their inputs to the work.en_US
dc.description.abstractThe XIFU detector, on board the ESA space mission Athena, must be shielded by specific filters from incoming ultraviolet and visible radiation due to bright astrophysical sources and infrared radiation heat load from the instrument, which would degrade its energy resolution. The current design for all five filters is a thin polyimide membrane, about 45 nm thick, coated with an aluminum layer of 30 nm. Filters are further equipped with a honeycomb Au/Ag-plated stainless steel mesh, or a niobium mesh for THF0, with a 5-mm pitch between cells, cell bars 40 to 50 μm wide, and a total blocking factor of about 2%. The mesh serves multiple purposes, such as structural strength, vibrational rigidity, radiofrequency attenuation and improved thermal conductivity. Filter uniformity requirements are not still defined. In order to perform this analysis, aimed at deriving requirements on the thickness uniformity of the filter membranes and on deriving design and/or operational constraints to prevent shadowing by the meshes, we have assumed that the impact of filters onto the image spatial uniformity at the focal plane shall be less than the uncertainty associated to calibration accuracy. The calibration accuracy requirement on the total XIFU QE currently identified in the calibration plan is the lowest between 4% absolute (0.04) in a given energy bin and 3% relative to the QE in that bin, over the full-energy range of interest, or a fixed value of 0.01 when QE is < 0.33. We use as input the Athena telescope PSF at the filter distances from the focal plane, obtained with a ray-tracing Monte Carlo code that follows incident photons from the mirror pupil up to the focal plane. Then, we employ an algorithm based on cross-correlation to study the effect on the filter stack transmission uniformity of checkerboard test patterns, meant to simulate thickness variations in the filter membrane at different spatial scales. We also study the shadowing effect of the filter meshes. The results of the study originate a new set of uniformity requirements for the filters.en_US
dc.language.isoengen_US
dc.titleEffects of the XIFU thermal filters on the focal plane spatial uniformityen_US
dc.typeResearch report-
dc.relation.mediumELETTRONICOen_US
dc.relation.volumeXIFU-UNPA-THF- RP-0001-i01-r00en_US
dc.relation.numberofpages27en_US
dc.type.refereeREF_2en_US
dc.description.numberofauthors3en_US
dc.description.internationalnoen_US
dc.contributor.countryITAen_US
dc.relation.scientificsectorFIS/05 - ASTRONOMIA E ASTROFISICAen_US
dc.identifier.classificationMissione L2 di ESA: Fase A-B1 della missione Athena Document produced within the international consortium for the development of the X-IFU instrument aboard the Athena ESA flagship space mission. The Italian participation to the development activities is funded with the ASI-INAF contract n. 2019-27-HH.0 (Missione L2 di ESA: Fase A-B1 della missione Athena) and adjournments. Product subject to Italian project management configuration control.en_US
dc.type.miur298 Altro-
dc.relation.ercsectorERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_17 Instrumentation – telescopes, detectors and techniquesen_US
dc.relation.versioning1en_US
dc.description.oa2 – prodotto con deroga per i casi previsti dalla Policy (allegare il modulo al passo 5-Carica)en_US
item.grantfulltextreserved-
item.languageiso639-1en-
item.fulltextWith Fulltext-
item.openairetypeResearch report-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.cerifentitytypePublications-
crisitem.author.deptO.A. Palermo-
crisitem.author.deptO.A. Palermo-
crisitem.author.deptO.A. Palermo-
crisitem.author.orcid0000-0002-7114-4031-
crisitem.author.orcid0000-0003-0318-3546-
crisitem.author.orcid0000-0002-3188-7420-
Appears in Collections:4.03 Rapporti di progetto
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XIFU-UNPA-THF-RP-0001-i01-r00_Effects of the XIFU thermal filters on the focal plane spatial uniformity.pdf[Administrators only]2.87 MBAdobe PDF
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