ztf detector/filter combinations p. jelinsky 2013-02-19 1
TRANSCRIPT
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ZTF Detector/Filter Combinations
P. Jelinsky
2013-02-19
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Optics Outline
• Look at different number of detectors– Can the sky be tiled?
• Do not consider gaps.• Do not consider mapping unto a sphere
– Can it use fixed filters efficiently– Does it have a viable stagable option?
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7 detectors• Cannot use fixed filters efficiently
(since odd number of detectors)
• Can tile the sky efficiently
• No feasible stagable options.
• Maximum off axis angle: 3.2°
No Vignetting
10%Vignetting
20%Vignetting
30%Vignetting
Tile Example
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8 detectors• Can use fixed filters efficiently
• Can tile the sky efficiently
• Has a feasible stagable option.– Start with 4 detectors along center line
• Maximum off axis angle: 3.6°
No Vignetting
10%Vignetting
20%Vignetting
30%Vignetting
Fixed Filter Layout 4 Filter Stage
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8 detectors (cont)
Tile Example Fixed Filter Tile Example(Shift 2 detectors horizontal)
(then shift 2 detectors vertical)
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9 detectors• Cannot use fixed filters efficiently
• Can tile the sky efficiently
• No feasible stagable option.
• Maximum off axis angle: 3.8°
No Vignetting
10%Vignetting
20%Vignetting
30%Vignetting
Tile Example
7
10 detectors• Can use fixed filters efficiently
• Can tile the sky efficiently
• Has feasible stagable option.– 6 detectors
• Maximum off axis angle: 3.8°
No Vignetting
10%Vignetting
20%Vignetting
30%Vignetting
Fixed Filter Layout 6 Detector Stage
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10 detectors (cont)
Tile Example Filter Tile Example(Do tile pattern to left)
(then shift 1 detectors horizontal)
9
12 detectors• Can use fixed filters efficiently
• Can tile the sky efficiently
• Has feasible stagable option.– 8 detectors
• Maximum off axis angle: 4.1°
No Vignetting
10%Vignetting
20%Vignetting
30%Vignetting
Fixed Filter Layout 8 Detector Stage
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12 detectors (cont)
Tile Example Filter Tile Example(Shift 2 detectors horizontal)
(then shift 3 detectors vertical)
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Conclusion
• 12 detector option is the most flexible– Can come on line early with 8 detectors (if needed)– Can use fixed filters (if acceptable)– Can tile the sky efficiently
• The major issue is cost