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ZTF CCD defocus Study

ZTF CCD defocus Study. P. Jelinsky 2013-04-09. Introduction. Moved the CCD locations (leaving all optics in orignal location Raytraced using Zemax to calculate the average FWHM of the image Used the Case XV optical design Should not be sensitive to the design (all are f/2.5).

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ZTF CCD defocus Study

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  1. ZTF CCD defocus Study P. Jelinsky 2013-04-09

  2. Introduction • Moved the CCD locations (leaving all optics in orignal location • Raytraced using Zemax to calculate the average FWHM of the image • Used the Case XV optical design • Should not be sensitive to the design (all are f/2.5)

  3. Results

  4. Results (zoom in)

  5. Conclusion • A ±30µm change • degrades the R from 0.6 to 1.0 arcsecond • degrades the G from 1.0 to 1.2 arcsecond • This brings the perfect optical design plus detector location to Eric’s budget • I would not be comfortable with more than ±30µm as a CCD specification • Less would be better

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