Several dielectric optical acceleration structures that have been designed in recent years are being compared. The unique properties of these structures entail challenging design of an overall acceleration module. Four possible configurations are being analyzed. Two important concepts are discussed: train of micro‐bunches and feedback loop. While the former facilitates acceleration of a large number of electrons, the latter enables energy recovery leading to higher efficiency. Their implications are considered and some rough estimates of luminosity are considered. © 2004 American Institute of Physics