| Interferometer |
|---|
| Number of ports | 2 |
| Maximal mechanical displacement | $±$5 mm |
| Mirror motion limited resolution (2 cm$^{-1}$) | Wavelength (nm) | Resolving power |
| | 370 | 13500 |
| | 400 | 12500 |
| | 450 | 11110 |
| | 500 | 10000 |
| | 650 | 7690 |
| | 800 | 6250 |
| Modulation efficiency | 365 nm: TBD |
| | 400 nm: TBD |
| | 450 nm: TBD |
| | 500 nm: TBD |
| | 600 nm: TBD |
| | 700 nm: TBD |
| | 800 nm: TBD |
| Median on-sky wavefront stability | TBD (<10 nm expected) |
| OPD metrology laser | Single 1550 nm laser diode |
| Calibration sources | 543.5 nm HeNe laser & white light |
| Optics |
|---|
| Field of view | 10.97' x 11.06' (camera A) |
| | 10.95' x 11.03' (camera B) |
| Mean pixel scale | 0.321" |
| Orientation | North is up, East to left |
| Field distortion | Distance from center | Camera A / Camera B |
| | 1.2' | 0% / 0% |
| | 2.4' | 0.12% / 0.09% |
| | 3.6' | 0.42% / 0.44% |
| | 4.8' | 0.88% / 0.93% |
| | 6.0' | 1.67% / 1.71% |
| Image quality | TBD (<0.7" expected for a 100 nm pass band, at image center, on lab measurements) |
| Cameras |
|---|
| CCD type | E2V CCD231-42-x-F61, Grad 0, back illuminated, NIMO Four Output, deep depletion silicon |
| Number of detectors | 2 (1 per port) |
| Detector size | 2048 x 2064 pixels each |
| Prescan pixels | 50 |
| Cosmetic quality | Defect type | Camera A / Camera B |
| | Point defects | 0 / 0 |
| | Bright columns | 0 / 0 |
| | Dark points | 0 / 13 |
| | Dark columns | 0 / 0 |
| | Traps (>200e$^{-}$) | 0 / 1 |
| | Total points | 0 / 13 |
| | Total columns | 0 / 0 |
| Crosstalk between channels | Signal < 20,000e$^{-}$: < 1e$^{-}$ (0.005%) |
| | Signal < 30,000e$^{-}$: < 20e$^{-}$ (0.07%) |
| | Signal < 50,000e$^{-}$: < 50e$^{-}$ (0.1%) |
| Transfer constant | No binning: 0.76$±$0.01 e$^{-}$/ADU |
| | 2x2 binning: 0.350$±$0.005 e$^{-}$/ADU (TBD) |
| | 3x3 binning: 0.35$±$0.01 e$^{-}$/ADU (TBD) |
| Digital encoding | 16 bit |
| Pixel full well | No binning: 49400$±$0.01e$^{-}$ |
| | 2x2 binning: 22800 e$^{-}$/ADU (TBD) |
| | 3x3 binning: 22800 e$^{-}$/ADU (TBD) |
| Readout noise | No binning: 4.1$±$0.8 e$^{-}$ (3.3$±$0.4 e$^{-}$, 1 outlier removed) |
| | 2x2 binning: 3.0$±$0.1 e$^{-}$ |
| | 3x3 binning: 3.1$±$0.2 e$^{-}$ |
| Regulation target temperature | -110ºC |
| Photo response non-linearity | TBD |
| Fringing | TBD |
| Dark current | < 2 e$^{-}$/pixel/hour (E2V value) |
| | < 2 e$^{-}$/pixel/hour (E2V value) |
| Filters |
|---|
| Filter exchange time | Maximum excursion (3 positions): TBD |
| | Minimum excursion (1 position): TBD |
| Filters available | SN1: 365-385 nm |
| link to all transmission curves | SN2: 480-520 nm |
| | SN3: 651-685 nm |
| | C1: 385-490 nm |
| | C2: 562-625 nm |
| Shutter |
|---|
| Shutter type | Bi-stable shutter (zero power consumption in open or closed state) |
| Shutter accuracy | TBD (jitter less than 5 ms expected from early testing) |
| Shutter maximum operation rate | 1 Hz |
| Shutter expected lifetime | 500,000 operations |
| Shutter opening time | 22 ms |
| Observing |
|---|
| Observing mode | Exclusively Queue Service Observing (QSO) |
| Dark/light time operation | To be scheduled based on science requirements of approved projects |
| North safe physical pointing limit | 45 degrees from zenith (+63.0 declination) |
| South safe physical pointing limit | 53 degrees from zenith (-28.0 declination) |
| Operation pointing limit | 45 degrees cone around zenith |
| Instrument rotation | Fixed, within $±$6' |
| Maximum image cadence | No binning: 3.25s/image |
| | 2x2 binning: 2.03s/image |
| | 3x3 binning: 1.28s/image |
| Data pre-processing | ORBS processing pipeline at CFHT |
