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A top view of the Cornell high-brightness photoinjector.
A new GaAs cathode (left) with one active area (silver). The blue area is oxidized to prevent emission. The same cathode (right) after use shows the effect of ion damage at the center. The previously blue oxidized area is now speckled after heat cleaning.
Beam current versus time using a GaAs cathode. The initial QE of 10% degraded to by the end. Over 200 C of charge was delivered from a single spot on the cathode.
The QE decay for a cathode versus time, with the current held constant at 60 mA.
The QE (%) map of the cathode before use (left), and after extended time above 50 mA (right). Over 2000 C of charge was extracted over the life of this cathode. The laser spot diameter was 2.5 mm.
The average beam current (blue) and cathode quantum efficiency (red) during the longest continuous running period using a cathode.
Requirements for the Cornell energy recovery linac prototype injector.
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