 With Backer's passing in 2010, Aaron Parsons has assumed leadership of PAPER on the side of UC Berkeley.The two fundamental concerns that most influence the design of any HI
reionization detection instrument are removing foregrounds and
achieving the requisite sensitivity.The PAPER approach heavily
emphasizes the former; the level of instrumental calibration and
foreground characterization that will be required to model and remove
polarized galactic synchrotron emission, continuum point-sources, and
galactic/extra-galactic free-free emission is unprecedented in the
100-200 MHz band expected to encompass reionization.