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20 July 2010 PAUCam filter interchange system
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The Physics of the Accelerating Universe (PAU) is a new project whose main goal is to study dark energy surveying the galaxy distribution. For that purpose we need to determine the galaxy redshifts. The most accurate way to determine the redshift of a galaxy and measure its spectral energy distribution (SED) is achieved with spectrographs. The PAU collaboration is building an instrument (PAUCam) devoted to perform a large area survey for cosmological studies using an alternative approach. SEDs are sampled and redshifts determined using narrow band filter photometry. For efficiency and manufacturability considerations, the filters need to be placed close to the CCD detector surfaces on segmented filter trays. The most innovative element of PAUCam is a set of 16 different exchangeable trays to support the filters arranged in a jukebox-like changing mechanism inside the cryostat. The device is designed to operate within the range of temperatures from 150K to 300K at the absolute pressure of 10-8mbar, being class-100 compliant.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
F. Madrid, O. Ballester, L. Cardiel-Sas, R. Casas, F. J. Castander, J. Castilla, J. de Vicente, E. Fernández, E. Gaztañaga, F. Grañena, J. Jiménez, M. Maiorino, P. Martí, R. Miquel, E. Sánchez, S. Serrano, I. Sevilla, and N. Tonello "PAUCam filter interchange system", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77353R (20 July 2010);


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