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MMT Megacam

The MMT Megacam, developed by Brian McLeod and the Smithsonian Astrophysical Observatory, features a high-resolution imaging system with a 36.2048x4608 pixel array composed of 13.5-micron pixels (e2v ccd42-90). With a current pixel scale of 0.16” (binning by 2), it operates at an impressive rate of 200 kps through 72 amplifiers. The imaging system, which includes additional CCDs for guiding and focus, achieves a gain of 3-4 e-/ADU and a read noise of 4-5 e- at 200 kHz. The device allows for precise astrometry and excellent image quality with noted performance variations across focal planes.

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MMT Megacam

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  1. MMT Megacam Brian McLeod Smithsonian Astrophysical Observatory

  2. Basic Parameters • 36 2048x4608 13.5micron pixels (e2v ccd42-90) • 0.08”/pixel, currently binned by 2 to 0.16” • 200kps through 72 amplifiers • 2 additional ccd42-90s for guiding/focus • SAO-built controller by John Geary

  3. Megacam as seen at SDW2002

  4. CCD SIMULATOR TEST BOX SCOPECONNECTIONS

  5. 300mmx300mm Sloan-r filter by Sagem

  6. Megacam Performance • Gain: 3-4 e-/ADU • Read noise: 4-5e- at 200kHz • CCD Temps: -115C to -130C depending on focal plane location • Some large scale flat fielding errors

  7. Image Quality FWHM (ARCSEC) PIXEL POSITION

  8. Astrometry Error relative to 2Mass catalog: 0.16” Dec Err (”) RA Err (”) Dec RA

  9. NGC6791 r-band 120s J. Hartman et al. astro-ph/ 0504487

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