Tanaka, T.
(Takashi Tanaka)

THBOC03 Emittance Measurement on the CeB6 Electron Gun for the SPring-8 Compact SASE Source
Kazuaki Togawa, Hitoshi Baba, Takahiro Inagaki, Kazuyuki Onoe, Tsumoru Shintake, Takashi Tanaka (RIKEN Spring-8 Harima, Hyogo), Hiroshi Matsumoto (KEK, Ibaraki)

A high-volatage pulsed electron gun has been constructed for the injector system of the soft X-ray FEL project at SPring-8 (SCSS project). A CeB6 single crystal was chosen as a thermionic cathode, because of its excellent emission properties. The gun voltage of -500 kV was chosen to reduce emittance growth due to space charge. We have succeeded in generating a 500 keV beam with 1 A peak current and 3 micro-sec FWHM. The beam was very stable with low jitter. The beam emittance has been measured by means of double-slits method, and the normalized rms emittance of 1.1 pi-mm-mrad has been obtained. We report on the experimental result on the emittance measurement of the CeB6 electron gun.

TUPOS19 FEL Simulation Code for Undulator Performance Estimation
Takashi Tanaka (RIKEN Spring-8 Harima, Hyogo)

In an FEL project based on the principle of SASE, a long undulator with a good field quality should be installed to ensure saturation. The performance of the undulator as a (spontaneous) synchrotron light source is represented by phase errors as well as the trajectory straightness. In addition, the synchrotron radiation from an undulator is easily calculated by Fourier transforming the electric field generated by an electron passing through the undulator field. On the other hand, an FEL simulation should be carried out with the actual magnetic field taken into account in order to estimate the undulator performance as an FEL driver. We have recently developed an FEL simulation code for such a purpose, the details of which will be presented in this paper.