Progress toward a high-energy, high luminosity {mu}{sup +}{mu}{sup {minus}} collider

In the past two years, considerable progress has been made in development of the {mu}{sup +}{mu}{sup {minus}} collider concept. This collider concept could permit exploration of elementary particle physics at energy frontiers beyond the reach of currently existing and proposed electron and hadron colliders. As a benchmark prototype, we present a candidate design for a high-energy high-luminosity {mu}{sup +}{mu}{sup {minus}} collider, with E{sub cm} = 4 TeV, L = 3 {times} 10{sup 34} cm{sup {minus}2}s{sup {minus}1}, based on existing technical capabilities. The design uses a rapid-cycling medium-energy proton synchrotron, producing proton beam pulses which are focused onto two {pi}-producing targets, with two {pi}-decay transport lines producing {mu}{sup +}`s and {mu}{sup {minus}}`s. the {mu}`s are collected, rf-rotated, cooled and compressed into a recirculating linac for acceleration, and then transferred into a storage ring collider. The keys to high luminosity are maximal {mu} collection and cooling, and innovations with these goals are presented. Possible variations and improvements are discussed. Recent progress in collider concept development is summarized, and future plans for collider development are discussed