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This paper discusses the behavior of electron bunch charge produced in anL-band normal conducting radio frequency cavity (RF gun) from Cs2Tephotocathodes illuminated with ps-long UV laser pulses when the lasertransverse distribution consists of a flat-top core with Gaussian-like decayinghalo. The produced charge shows a linear dependence at low laser pulse energiesas expected in the quantum efficiency limited emission regime, while itsdependence on laser pulse energy is observed to be much weaker for highervalues, due to space charge limited emission. However, direct plug-in ofexperimental parameters into the space charge tracking code ASTRA yields loweroutput charge in the space charge limited regime compared to measured values.The rate of increase of the produced charge at high laser pulse energies closeto the space charge limited emission regime seems to be proportional to theamount of halo present in the radial laser profile since the charge from thecore has saturated already. By utilizing core + halo particle distributionsbased on measured radial laser profiles, ASTRA simulations and semi-analyticalemission models reproduce the behavior of the measured charge for a wide rangeof RF gun and laser operational parameters within the measurementuncertainties.

Studies on charge production from Cs2Te photocathodes in the PITZ L-band normal conducting radio frequency photo injector