The Xerox iGen3 digital press uses a gapped powder-cloud development system known as Hybrid Scavengeless Development (HSD) for its Image-on-Image process. HSD differs in many ways from typical two-component magnetic brush development systems. This paper describes the iGen3 HSD system and discusses some of its fundamental performance characteristics, concentrating on the relationship between developability and parameters that affect electric fields and toner supply.
Mark J. Hirsch, "Some Fundamental Performance Aspects of the Xerox iGen3 Development System" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP22), 2006, pp 398 - 401, https://doi.org/10.2352/ISSN.2169-4451.2006.22.1.art00021_2