title: Optical performances of the Ultraviolet Coronagraph Spectrometer of the Solar Heliospheric Observatory.
abstract: The optical performances of the spectrometer assembly for the Ultraviolet Coronagraph Spectrometer of the Solar and Heliospheric Observatory mission have been tested. The flight unit of the spectrometer assembly, consisting of the structure equipped with the entrance slits assembly, the grating drive mechanisms mounting two toroidal gratings, and the photon-counting detectors, has been integrated and aligned; also the flight unit of the White Light Channel has been integrated and aligned in the spectrometer assembly. Tests with both visible and UV radiation have been performed. Aberration and stray-light measurements have shown that the instrument performs satisfactorily, almost in compliance with the scientific requirements; also some measurements of the polarimeter modulation curve and the relative error have shown performances within the specified requirements.
authors.affiliation: Department of Electronics and Informatics, Istituto Nazionale per la Fisica della Materia, University of Padua, I-35131 Padova, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Pernechele
authors.forename: G
authors.initials: G
authors.lastname: Naletto
authors.forename: P
authors.initials: P
authors.lastname: Nicolosi
authors.forename: G
authors.initials: G
authors.lastname: Tondello
authors.forename: S
authors.initials: S
authors.lastname: Fineschi
authors.forename: M
authors.initials: M
authors.lastname: Romoli
authors.forename: G
authors.initials: G
authors.lastname: Noci
authors.forename: D
authors.initials: D
authors.lastname: Spadaro
authors.forename: J L
authors.initials: JL
authors.lastname: Kohl