Abstract
A VUV beamline (ABL-3B) for real-time photoelectron spectroscopy has been developed at the normal-conducting accelerating ring (NAR) of the NTT synchrotron radiation facility. To accept the incident synchrotron radiation beam with the wide horizontal divergence angle of 20 mrad, a 1.38-m-long cylindrically bent front mirror was devised. This mirror was composed of four plane mirror blocks connected together and mounted on a steel holder beam having a C-shaped cross section. The mirror holder can be bent by a novel bending device with a momentum of 1388 kg cm to achieve the optimum radius of the curvature of 63.9 m. The focused spot of 3.5 mm (H)×1.8 mm (V) was preliminarily obtained on the sample position by bending the front mirror. When the stored electron beam current was 50 mA and the “grasshopper” monochromator was tuned at 130 eV, a photon flux of 1.5×10 10 photons/s was obtained with the energy resolution of 0.5 eV.
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