|In Brief:||UCLES is a cross-dispersed Echelle spectrograph located at
focus offering high resolution combined with good wavelength coverage.
CYCLOPS2 is a cassegrain fibre-feed for UCLES. It is expected to be the default feed for most applications using the 79 l/mm echelle longwards of 4000A. Prospective users should consult the CYCLOPS2 status page and CYCLOPS2 web page at UNSW for more information.
|Instrument Scientist:||Gayandhi de Silva
See Instrument Scientist page for contact details.
|Manual:||AAO UM-25.3 "The UCL Coudé Echelle Spectrographs", Stathakis et al, 2000.|
UCLES ThAr Atlas with the MITLL and EEV CCDs, Ryder, 2001.
AAO Precision Velocity Instrument for UCLES - Iodine Cell
For recently updated information see the UCLES Cookbook
A service programme is available for projects requiring <6 hrs.
|Detector:||Blue-sensitive EEV2 2K×4K (13.5 micron pixels) or red-sensitive MITLL3 2K×4K (15 micron pixels).|
|Focal Station:||Mounted at Coudé with f/36 top end.|
|Image Scale:||0.16 arcsec per spatial pixel with EEV2 and 0.18 arcsec per spatial pixel with MITLL3. All measurements taken without the focal modifier.|
|Spectral Resolution*:||R = >100 000 possible with the EEV2, and <80 000 with the MITLL3. Note however that a 1 arcsec slit yields R~45,000.|
|Gratings:||31.6 lines/mm gives almost continuous wavelength coverage at
bluer wavelengths, with short slit length (6-15 arcsec).
79 lines/mm gives 2.5 times longer slit, but less complete wavelength coverage.
Both gratings produce almost identical dispersion and resolution.
|Sensitivities:||See the Signal-to-Noise Calculator.|
|*Spectral Resolution R measured as &lambda/&delta&lambda, where &delta&lambda = FWHM unresolved line, usually 2 pixels.|
Gayandhi De Silva, AAT Technical Secretary, aatts -@- aao.gov.au