The guiding design principle of SWIFT is that it is an integrated telescope+spectrograph optimized for wide-field, extremely efficient, and highly multiplexed slitlet spectroscopy. To achieve this goal, the spectrograph and telescope optics are designed together as a system. The primary design objective is to preserve as wide a field of view as possible on as large an aperture as possible without compromising the capability for highly efficient beam-fed spectroscopy. In this section, we outline one possible realization of SWIFT which minimizes risk and can be built at the present time. Although the current design demonstrates the technological feasibility of the concept as an `existence theorem', in practice there are various technological paths we intend to investigate in order to maximize the scientific effectiveness of this facility and enable us to determine the relevant technological paths to future instrumentation on the next generation of large-aperture telescopes.
|Fore-optic||>8-m diameter effective aperture|
|Field of view||1.5o diameter|
|Wavelength range||0.36 -- 1.7 micron|
|Spectral resolution||500, 5000, 25000|
|Image quality||<0.25 arcsec1|
|Total system throughput||50% optical; 40% near-IR|
|3DT 8.4m||6.9||0.1?||180' dia.||<500||fiber|
|GTC||10||EMIR||?||6' dia||10||fiber or slit?|
1 Optical throughput of spectrograph and telescope.
2 Maximum number of objects which can be simultaneously observed.
3 Sky subtraction with fibers sets a limit of mag on faint-object spectroscopy.