Performance of a very high resolution soft x-ray beamline BL25SU with a twin-helical undulator at SPring-8

Saitoh, Y.; Kimura, H.; Suzuki, Y.; Nakatani, T.; Matsushita, T.; Muro, T.; Miyahara, T.; Fujisawa, M.; Soda, K.; Ueda, S.; Harada, H.; Kotsugi, M.; Sekiyama, A.; Suga, S.
September 2000
Review of Scientific Instruments;Sep2000, Vol. 71 Issue 9
Academic Journal
We report on the excellent performance of a newly constructed soft x-ray helical undulator beamline BL25SU of SPring-8 for photon energies 500-1800 eV. The full beamline was designed to perform very high resolution soft x-ray spectroscopy of solids with using high brilliance, highly circularly polarized undulator radiation. The grazing incidence monochromator employs varied-line-spacing plane gratings which operate in convergent light from a spherical mirror and focuses monochromatic light onto the exit slit. A resolving power in excess of 15 000 was measured at 540 and 870 eV for a grating with a central groove density of 600 lines/mm from the photoemission spectra of Au. A resolving power of more than 20 000 is estimated near 870 eV for a grating with a central groove density of 1000 lines/mm. A photon flux of more than 1x10[sup 11] photons/s/100 mA/0.02% b.w. is supplied onto the sample between 500 and 1800 eV with very low amount of higher-order light. The low heat load from the twin-helical undulator gives high stability to all optical components, which is essential to obtain high resolution in a wide energy region. Three experimental stations are installed in tandem on this beamline for various high resolution spectroscopy measurements. © 2000 American Institute of Physics.


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