Abstract: In this paper we describe the plans at Stanford University for an x-ray (1.5 - 15 angstroms) free-electron laser based on the last kilometer, 15 - 5 GeV, of the SLAC linear accelerator. The technical requirements are summarized as well as the novel scientific opportunities with this fourth generation source. It is concluded that with the present research and development efforts under way it should be possible to start the construction of such a facility as early as 2002 with a completion date in 2005.!22
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