2021-04-122005-08-300277786X1996756Xhttp://hdl.handle.net/10784/27963EMIR is a NIR multiobject spectrograph with imaging capabilities to be used at the GTC. The first collimator lens in EMIR, made of Fused Silica, has an outer diameter of 490 mm, and a weight of 265 N, which make it one of the largest Fused Silica lenses ever mounted to work under cryogenic conditions. The results of the various tests being done at the IAC (with two different lens dummies) in order to validate a mounting design concept for this lens, are presented here. The radial support concept tested consists of three contact areas around the lens, one of which is a PTFE block, preloaded by coil springs and the other two are fixed supports made of Aluminum and PTFE, dimensioned in order to keep lens centered both at room temperature and under operation conditions.enghttps://v2.sherpa.ac.uk/id/publication/issn/0277-786Xinfo:eu-repo/semantics/conferencePaperAluminumCryogenicsElectric coilsFused silicaOptical collimatorsThermal effectsIR instrumentationLarge lensOptical MountsImaging techniques2021-04-12Barrera, S.González, C.Manescau, A.Abreu, D.Becerril, S.Correa, S.Fragoso, A.Pérez, J.Redondo, P.Restrepo, R.Saavedra, P.Sánchez, V.Tenegi, F.Garzón, F.Patrón, J.10.1117/12.614899