The Near IR Spectrometer Photometer (NISP) is an infrared spectro-photometer that will equip the Euclid Space Telescope (launch planned for 2021) to better understand dark matter and dark energy. After three years of R&D leading to a qualification model, and 6 months for the construction and testing of the flight model, the two NISP cryomotors successfully passed all the acceptance tests in November. A team of physicists, engineers and technicians from CEA-Irfu is ready to deliver them to the Euclid/NISP instrumental consortium. These cryomotors are designed to rotate the filter and grey carrier wheels1 that will determine the observation mode of the NISP camera in photometry or spectroscopy. These two modes are essential for measuring the shape and age of galaxies.
1A grism is a prism whose one side is machined to form a diffraction grating to allow only one wavelength to pass through.
