Open Access
Table 3
SunCET instrument parameters needed to calculate SNR.
| Instrument parameter | Value | Description |
|---|---|---|
| Wavelength | 170–200 Å | Broadband response defined by mirror coating |
| Aperture size | 44.9 cm2 | 9.6 cm diameter truncated on two sides to a height of 7.62 cm and a 4.8 cm diameter secondary mirror obscuring its center |
| Weighted factor for broadband | 6.88 | 7 emissions in the bandpass weighted by their quiet-Sun intensity to the 195 Å emission line (see Table 1) |
| Pixel size | 7 μm × 7 μm | e2v CIS115 datasheet and confirmed in house |
| Pixel array | 1500 × 1500 | Full array is 1504 × 2000; ∼5 rows dedicated to dark |
| FOV | 4 R⊙ | Design FOV (requirement is 3.5 R⊙) |
| Plate scale | 4.811/pixel | From pixel size, number of pixels, and FOV; Note that 2×2 binning will be applied, resulting in 9.611/resolution-element |
| Optics throughput | 0.06 | 2 mirrors with B4C/Mo/Al coatings (0.35 each), entrance Al/C filter (0.6) with 5 lpi filter mesh (0.98), Al secondary/pinhole filter (0.85) |
| Quantum yield | 18.3 e−/ph | Average over 170–200 Å bandpass |
| Dark noise | <0.08 e−/pixel/sec | At −10 °C, from LASP lab tests |
| Readout noise | 5 e−/pixel | From LASP lab tests |
| Fano noise | 1.3 e−/pixel | Fano factor of 0.1 for Si |
| Max read rate | 0.1 sec (full frame) 0.025 (up to 500 rows) | In SunCET, 500 rows corresponds to 0–1.33 R⊙ |
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