Announcements
EMCCDs
'Alopeke & Zorro have two iXon Ultra 888 back-illuminated Electron Multiplying CCDs (EMCCDs).
| Type | iXon Ultra 888 EX |
| Size | 1024 x 1024 |
| Pixel Size | 13 μm |
| Dark current | 0.0002 e-/pix/sec |
| Well depth | 80,000 e- |
| Linearity | better than 99.9% |
| Timestamp accuracy | 10 ns |
| EMCCD Minimum Exposure Time (s) | |||
|---|---|---|---|
| ROI / Binning | 1x1 | 2x2 | 4x4 |
| 1024x1024 | 0.0562 | 0.0278 | 0.0135 |
| 512x512 | 0.0282 | 0.0140 | |
| 256x256 | 0.0144 | ||
| Conventional Amplifier Minimum Exposure Time (s) | |||
|---|---|---|---|
| ROI | Binning | 0.1 MHz | 1.0 MHz |
| 1024 x 1024 | 1 x 1 | 11.01 | 1.102 |
| 1024 x 1024 | 2 x 2 | 2.957 | 0.356 |
| 1024 x 1024 | 4 x 4 | 0.852 | 0.130 |
| 512 x 512 | 1 x 1 | 5.52 | 0.552 |
| 512 x 512 | 2 x 2 | 2.13 | 0.228 |
| 512 x 512 | 4 x 4 | 0.917 | 0.103 |
| Read Noise (e-) | ||||||
| EMCCD Amplifier | Conventional Amplifier | |||||
| Readout Speed (MHz) | 30 | 20 | 10 | 1 | 1 | 0.1 |
| Without EM | 130 | 80 | 40 | 12 | 6 | 3.5 |
| With EM | <1 | <1 | <1 | <1 | - | - |
| Gains | ||||
| Camera (Serial Number) |
Amplifier | HSSPEED (MHz) |
PREAMP Setting |
Gain (e-/ADU) |
| Alopeke Red (X-10244) |
Electron Multiplying | 30 | 2 | 5.61 |
| Electron Multiplying | 20 | 2 | 4.39 | |
| Conventional CCD | 1 | 2 | 0.80 | |
| Alopeke Blue (X-10405) |
Electron Multiplying | 30 | 2 | 5.54 |
| Electron Multiplying | 20 | 2 | 4.42 | |
| Conventional CCD | 1 | 2 | 0.76 | |
| Zorro Red (X-11807) |
Electron Multiplying | 30 | 2 | 5.42 |
| Electron Multiplying | 20 | 2 | 4.60 | |
| Conventional CCD | 1 | 2 | 0.78 | |
| Zorro Blue (X-11828) |
Electron Multiplying | 30 | 2 | 5.69 |
| Electron Multiplying | 20 | 2 | 4.76 | |
| Conventional CCD | 1 | 2 | 0.77 | |
Filters
'Alopeke and Zorro use a dichroic beam splitter to simultaneously image in two filters. The incident light is split at 674 nm, reflecting blue light through the blue filter wheel and transmitting red light through the red filter wheel.
| Filter Name | Central Wavelength (nm) | Width (nm) | Transmission |
| Dichroic | 674 | - | data, plot |
| Pickoff Mirror | - | - | data, plot |
| Blue Wheel | |||
| XSDSS u' | 352 | 46 | data, plot |
| EO 466 | 466 | 44 | data, plot |
| XSDSS g' | 479 | 154 | data, plot |
| EO 562 | 562 | 54 | data, plot |
| XSDSS r' | 620 | 145 | data, plot |
| H-alpha | 656.52 | 3.22 | data, plot |
| Red Wheel | |||
| EO 716 | 716 | 52 | data, plot |
| XSDSS i' | 765 | 148 | data, plot |
| EO 832 | 832 | 40 | data, plot |
| XSDSS z' | 947 | 236 | data, plot |
