Description
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.
Technical Data
"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"