Instrumento Floyds

    FLOYDS is a cross-dispersed, low resolution spectrograph, installed at both 2-m telescopes. The wavelength coverage is extremely broad -- with 540-1000nm in first order and 320-570nm in second order, recorded in a single exposure. Resolution varies from R=400 to R=700, and is roughly 0.35 nm/pixel in 1st order and 0.17 nm/pixel in second order. Each FLOYDS has a set of four (30" long) slits with widths of 1.2", 1.6", 2.0", and 6.0".  These project to 3.5, 4.4, 4.9, and 14.4 pixels respectively on the detector.  Acquisition and guiding is done robotically via a separate camera which images the slit and produces a 6.4’x4.3’ field of view.

    "Spectrograph Detector:  Andor Newton DU940P-BU
    Format:  2048x512, 13.5 micron
    Spatial pixel scale:  0.34""
    Acquisition/Guide Detector:  SBIG ST-1603 1530x1020, 9 micron
    Acquisition/Guide FOV:  6.4x4.3 arcmin
    FLOYDS cycle time (readout + write):  26s
    Gain:  2.0 electrons/count
    Read Noise :  3.3 electrons
    Dark Current:  negligible
    Slits on FTN (30"" long) :   [1.2,1.6,2.0,6.0] arcsec
    Slits on FTS (30"" long):  [1.2,1.6,2.0,6.0] arcsec"