Author/Authors :
Dowell، نويسنده , , D.H and Bolton، نويسنده , , P.R. and Clendenin، نويسنده , , J.E. and Gierman، نويسنده , , S.M. and Limborg، نويسنده , , C.G. and Murphy، نويسنده , , B.F and Schmerge، نويسنده , , J.F. and Shaftan، نويسنده , , T.، نويسنده ,
Abstract :
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 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. Preliminary Parmela calculations show this correlation results from the strong longitudinal space charge forces in this short 2-ps long bunch.
