SALMASO, BiancaBiancaSALMASOBasso, S.S.BassoGhigo, M.M.GhigoSPIGA, DanieleDanieleSPIGAVecchi, G.G.VecchiSIRONI, GIORGIAGIORGIASIRONICOTRONEO, VincenzoVincenzoCOTRONEOConconi, PaoloPaoloConconiREDAELLI, Edoardo Maria AlbertoEdoardo Maria AlbertoREDAELLIBIANCO, ANDREAANDREABIANCOPARESCHI, GiovanniGiovanniPARESCHITAGLIAFERRI, GianpieroGianpieroTAGLIAFERRISisana DavidePelliciari CarloFIORINI, MAUROMAUROFIORINIINCORVAIA, SALVATORESALVATOREINCORVAIAUSLENGHI, MICHELAMICHELAUSLENGHIPAOLETTI, LorenzoLorenzoPAOLETTIFERRARI, CLAUDIOCLAUDIOFERRARILolli R.Zappettini, A.A.ZappettiniSanchez del Rio, M.M.Sanchez del RioParodi, G.G.ParodiBurwitz, V.V.BurwitzRukdee, S.S.RukdeeHartner, GGHartnerMuller, T.T.MullerSchmidt, T.T.SchmidtLangmeier, A.A.LangmeierFerreira, D.D.D.D.FerreiraMassahi, S.S.MassahiGellert, N.C.N.C.GellertChristensen, F.F.ChristensenBavdaz, M.M.BavdazFerreira, I.I.FerreiraCollon, M.M.CollonVacanti, G.G.VacantiBarriere, N.N.Barriere2023-01-132023-01-13202297815106534360277-786Xhttp://hdl.handle.net/20.500.12386/32858The BEaTriX (Beam Expander Testing X-ray) facility is now operative at the INAF-Osservatorio Astronomico Brera (Merate, Italy). This facility has been specifically designed and built for the X-ray acceptance tests (PSF and Effective Area) of the ATHENA Silicon Pore Optics (SPO) Mirror Modules (MM). The unique setup creates a parallel, monochromatic, large X-ray beam, that fully illuminates the aperture of the MMs, generating an image at the ATHENA focal length of 12 m. This is made possible by a microfocus X-ray source followed by a chain of optical components (a paraboloidal mirror, 2 channel cut monochromators, and an asymmetric silicon crystal) able to expand the X-ray beam to a 6 cm × 17 cm size with a residual divergence of 1.5 arcsec (vertical) × 2.5 arcsec (horizontal). This paper reports the commissioning of the 4.5 keV beam line, and the first light obtained with a Mirror Module.STAMPAenConference paper10.1117/12.26282272-s2.0-85140488008https://doi.org/10.1117/12.2628227FIS/05 - ASTRONOMIA E ASTROFISICA