A Review of Metallic Photocathode Research

We have assumed that a Magnesium (Mg) photocathode can produce a quantum efficiency on the order of 10, which is based on a QE graph posted on the Brookhaven National Laboratory Accelerator Test Facility website. The link to this plot is listed below. This ARDB technical note is an attempt to understand where the data came from and under what experimental conditions the data was taken. Experiments conducted at the UCLA Neptune Laboratory on an exact copy of the ORION RF gun indicate that the Mg quantum efficiency (QE) is 2.5x10 using normal incidence and a laser injection phase of 45 with respect to the zero crossing [11]. http://www.bnl.gov/atf/capfiles/photocat/quantum_eff.html.