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Longitudinal Measurements at the SLAC Gun Test Facility


The Gun Test Facility (GTF) was built to test high-brightness sources for the proposed Linac Coherent Light Source (LCLS) at SLAC. The longitudinal emittance exiting the gun has been determined by measuring the energy spectrum after the linac as a function of the linac phase. The phase-space parameters defining the beam pulse width, correlated energy spread, and slice energy spread at the linac entrance (~5 MeV beam energy) are fit to the measured energy spectra. A large, linear energy-time correlation is observed for bunch charges from 15 to 300 pC. Possible explanations for this correlated energy spread are discussed.

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