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A high-voltage pulsed electron gun has been developed for the low-emittance injector system of the x-ray free electron laser (FEL) project at SPring-8. A single-crystal CeB_{6} cathode was chosen as a thermionic emitter because of its excellent emission properties, i.e., smooth surface, high emission density, uniform emission density, and high resistance to contamination. A gun voltage of -500  kV was determined as a compromise between the need for suppressing emittance growth and reducing the risks of high-voltage arcing. We have succeeded in producing a 500 keV beam with 1 A peak current and 3   μs width. We have also measured the beam emittance by means of the double-slit method and obtained an extremely low emittance of 1.1π  mm mrad (normalized, rms). These results are very promising for the x-ray FEL. In this paper, we describe the design and basic performance of the CeB_{6} electron gun, and report the emittance measurement experiments

physical review special topics. accelerators and beams

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>CeB</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math>electron gun for low-emittance injector

CeB6electron gun for low-emittance injector