%0 Journal Article %T Progress in Monte Carlo design and optimization of the Cherenkov Telescope Array %A K. Bernl£¿hr %A A. Barnacka %A Y. Becherini %A O. Blanch Bigas %A A. Bouvier %A E. Carmona %A P. Colin %A G. Decerprit %A F. Di Pierro %A F. Dubois %A C. Farnier %A S. Funk %A G. Hermann %A J. A. Hinton %A T. B. Humensky %A T. Jogler %A B. Kh¨¦lifi %A T. Kihm %A N. Komin %A J. -P. Lenain %A R. L¨®pez-Coto %A G. Maier %A D. Mazin %A M. C. Medina %A A. Moralejo %A R. Moderski %A S. J. Nolan %A S. Ohm %A E. de O£¿a Wilhelmi %A R. D. Parsons %A M. Paz Arribas %A G. Pedaletti %A S. Pita %A H. Prokoph %A C. B. Rulten %A U. Schwanke %A M. Shayduk %A V. Stamatescu %A P. Vallania %A S. Vorobiov %A R. Wischnewski %A M. Wood %A T. Yoshikoshi %A A. Zech %A for the CTA Consortium %J Physics %D 2013 %I arXiv %X The Cherenkov Telescope Array (CTA) will be an instrument covering a wide energy range in very-high-energy (VHE) gamma rays. CTA will include several types of telescopes, in order to optimize the performance over the whole energy range. Both large-scale Monte Carlo (MC) simulations of CTA super-sets (including many different possible CTA layouts as sub-sets) and smaller-scale simulations dedicated to individual aspects were carried out and are on-going. We summarize results of the prior round of large-scale simulations, show where the design has now evolved beyond the conservative assumptions of the prior round and present first results from the on-going new round of MC simulations. %U http://arxiv.org/abs/1307.2773v1