Abstract
At the Gun Test Facility (GTF), we have been testing an S-band RF gun similar to the one to be used in the Linac Coherent Light Source (LCLS) Photo-Injector. The beam transverse properties have been extensively characterized on that gun and it was shown that this gun is capable of providing slice emittances of less than 1 mm.mrad for 100A slices [1]. The longitudinal beam properties are now also being investigated for 2 principal reasons: (1) the transverse beam properties are correlated to the longitudinal one; an excessively large correlated energy spread at the gun exit would damage the emittance compensation; and (2) the uncorrelated rms energy spread as small as 10keV at the gun exit is required for a good lasing in the LCLS. To measure the longitudinal emittance, the booster phase scan technique has been used at the GTF as described in [2]. We have now performed simulations of this experiment to better understand the non-linear effects and to reconstitute the longitudinal emittance.
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