Linac Design for the LCLS Project at SLAC

The Linac Coherent Light Source (LCLS) at SLAC is being designed to produce intense, coherent 0.15-nm x-rays. These x-rays will be produced by a single pass of a 15-GeV bunched electron beam through a long undulator. Nominally, the bunches have a charge of 1 nC, normalized transverse emittances of less than 1.5π mm-mr and an rms bunch length of 20 μm. The electron beam will be produced using the last third of the SLAC 3-km linac in a manner compatible with simultaneous operation of the remainder of the linac for PEP-II. The linac design necessary to produce an electron beam with the required brightness for LCLS is discussed, and the specific linac modifications are described. Contributed to the 1997 Particle Accelerator Conference Vancouver, B.C., Canada, May 12-16, 1997 * Work supported by Department of Energy contract DE–AC03–76SF00515. LINAC DESIGN FOR THE LCLS PROJECT AT SLAC* V.K. Bharadwaj, K. Bane, J. Clendenin, P. Emma, J.C. Sheppard, M.D. Woodley Stanford Linear Accelerator Center, Stanford, California 94309