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Record high-average current from a high-brightness photoinjector
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Image of FIG. 1.
FIG. 1.

A top view of the Cornell high-brightness photoinjector.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

The QE decay for a cathode versus time, with the current held constant at 60 mA.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

The average beam current (blue) and cathode quantum efficiency (red) during the longest continuous running period using a cathode.


Generic image for table
Table I.

Requirements for the Cornell energy recovery linac prototype injector.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Record high-average current from a high-brightness photoinjector