Low-emittance Electron Gun for X-ray Free Electron Laser at SPring-8

Kazuaki TOGAWA
2012 Journal of the Vacuum Society of Japan  
A low-emittance electron gun has been developed for the x-ray free electron laser facility at SPring 8 that was named as SACLA. The gun uses a single-crystal cerium hexaboride (CeB 6 ) cathode as a thermionic emitter to produce a low-emittance electron beam. A pulsed high-voltage of 500 kV is applied on the cathode to obtain more than 1 A peak current without emittance degradation. A normalized emittance of the beam was measured to be 0.6 mm mrad. This value is satisˆed with a requirement of
more » ... CLA. The CeB 6 electron gun is brie‰y reviewed in this paper.
doi:10.3131/jvsj2.55.73 fatcat:jkn7ngtzpnatnlqblfdlxkoqqy