The following tables list the optical characteristics
of KCWI. In some instances (denoted by *) predicted values
are listed in lieu of actual measurements.
Table 1: Optical Characteristics
| Location |
Left Nasmyth platform, Keck II; removable from
focus |
| Bandpass (blue channel) |
350 to 560 nm |
| Bandpass (red channel) |
560 to 1080 nm |
| Field of View |
20.4 arcsec x (8.4, 16.5, or 33.1) arcsec selectable |
| Telescope Plate Scale |
1.375 arcsec/pixel |
| Detector Plate Scale |
0.15 arcsec/pixel
|
| IFU Pupil Array Radius |
225 mm
|
| IFU Slicer Radius |
5200 mm
|
| Aberration Correction |
Cylindrical fold mirror |
| Slit Height |
14.5 mm = 20.4 arcsec |
| Slit Width |
0.25, 0.5, 1 mm = 0.35, 0.69, 1.38 arcsec selectable |
| Beam Size |
150 mm |
| Collimator Focal Length |
2160 mm |
| Camera Focal Length |
305 mm |
| Gratings |
VPH, 250 x 350 mm, selectable |
| Blue Detector |
e2v 4kx4k, 15 microns pixel, thin, AR-coated CCD |
| Red Detector |
LBNL 4kx4k, back-illuminated AR-coated CCD; 15 micron pixels; 500um thick Si substrate; Archon Controller |
| Image Resolution |
~ 10 microns RMS (seeing-limited) |