The deliberations concentrated on science drivers in the morning, and technical issues in the afternoon. For these observations, nD 2 should be optimized. Interpretation of a single pointed image made of the central star formation region cannot proceed on sound footing without knowledge of the surrounding region. For these observations, nD should be optimized. Any diameter can provide these mosaiced images if the antennas meet specifications, including total power capability.
Sensitivity increases with diameter.
A minimum sensitivity exists with which the array will be capable of addressing high z problems, as well as gaps caused by forming planets in protoplanetary disks. This drives nD 2 upward. Similar quantitative arguments for characterizing a minimum value for nD for the LAMA need to be made, and are currently being formulated. If it is decided to push antenna design, there is necessarily a large risk involved. The antenna is a major expenditure, and possibilities for upgrades to the antennas are limited.