Svetina, C.Grazioli, C.Alagia, M.Avaldi, L.Cautero, G.de Simone, M.Devetta, M.Di Fraia, M.Drabbels, MarcelFava, C.Feyer, V.Finetti, P.Gerusina, S.Katzy, R.Kivimaki, A.Lyamayev, V.Mahne, N.Mazza, T.Moises, A.Moller, T.O'Keeffe, P.Ovcharenko, Y.Piseri, P.Plekan, O.Prince, K.Raimondi, L.Sergo, R.Stienkemeier, F.Stranges, S.Zangro, MCoreno, M.Callegari, C.2014-10-312014-10-312014-10-31201510.1107/S1600577515005743https://infoscience.epfl.ch/handle/20.500.14299/108123WOS:000353920300013The Low Density Matter (LDM) beamline has been built as part of the FERMI free-electron laser (FEL) facility to serve the atomic, molecular and cluster physics community. After the commissioning phase, it received the first external users at the end of 2012. The design and characterization of the LDM photon transport system is described, detailing the optical components of the beamline.beam linefree electron laserlow density matterphoton transportmetrologyThe Low Density Matter (LDM) beamline of FERMI: optical layout and first commissioningtext::journal::journal article::research article