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We describe the HST ACS Coma cluster Treasury survey, a deep two-passbandimaging survey of one of the nearest rich clusters of galaxies, the Comacluster (Abell 1656).  The survey was designed to cover an area of 740 square arcmin in regions ofdifferent density of both galaxies and intergalactic medium within the cluster.The ACS failure of January 27th 2007 leaves the survey 28% complete, with 21ACS pointings (230 square arcmin) complete, and partial data for a further 4pointings (44 square arcmin).  Predicted survey depth for 10 sigma detections for optimal photometry ofpoint sources is g' = 27.6 in the F475W filter, and IC=26.8 mag in F814 (ABmagnitudes). Initial simulations with artificially injected point sources show90% recovered at magnitude limits of g' = 27.55 and IC = 26.65. For extendedsources, the predicted 10 sigma limits for a 1 square arcsecond region are g' =25.8 mag/sq. arcsec and IC = 25.0 mag/sq. arcsec.  We highlight several motivating science goals of the survey, including studyof the faint end of the cluster galaxy luminosity function, structuralparameters of dwarf galaxies, stellar populations and their effect on colorsand color gradients, evolution of morphological components in a denseenvironment, the nature of ultra compact dwarf galaxies, and globular clusterpopulations of cluster galaxies of a range of luminosities and types. Thissurvey will also provide a local rich cluster benchmark for various well knownglobal scaling relations and explore new relations pertaining to the nuclearproperties of galaxies.

The HST/ACS Coma Cluster Survey: I - Survey Objectives and Design