MMT Megacam

Brian McLeod

Smithsonian Astrophysical Observatory

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

Megacam as seen at SDW2002

CCD SIMULATOR TEST BOX

SCOPE CONNECTIONS

300mmx300mmSloan-r filterby Sagem

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

Quantum Efficiency

0

10

20

30

40

50

60

70

80

90

100

350 450 550 650 750 850 950

Wavelength (nm)

Percent

Specification

00014-02-03

00014-05-05

8434-18-05

00014-06-03

8434-12-03

8434-12-05

9283-10-04

8352-09-04

8351-02-04

00091-20-03

00091-09-03

00101-01-05

00014-10-05

00014-20-04

00184-05-03

00014-10-03

00184-17-05

00014-10-04

00184-05-04

00184-16-04

00184-08-03

00183-01-03

00183-01-04

00184-14-05

00184-16-03

00184-16-05

00091-05-04

00091-16-05

00183-03-04

00091-05-03

00091-02-04

00237-02-04

Image Quality

PIXEL POSITION

FWHM(ARCSEC)

Astrometry

RADec

RAErr(”)

DecErr(”)

Error relative to 2Mass catalog: 0.16”

NGC6791r-band 120s

J. Hartmanet al.astro-ph/0504487