Performance Of Blo7a At Newsubaru With Installation Of A New Multi-Layered-Mirror Monochromator

Shotaro Tanaka, Shuto Suzuki, Tomohiro Mishima,Kazuhiro Kanda

JOURNAL OF SYNCHROTRON RADIATION(2021)

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摘要
Soft X-rays excite the inner shells of materials more efficiently than any other form of light. The investigation of synchrotron radiation (SR) processes using inner-shell excitation requires the beamline to supply a single-color and highphoton-flux light in the soft X-ray region. A new integrated computing multilayered-mirror (MLM) monochromator was installed at beamline 07A (BL07A) of NewSUBARU, which has a 3 m undulator as a light source for irradiation experiments with high-photon-flux monochromatic light. The MLM monochromator has a high reflectivity index in the soft X-ray region; it eliminates unnecessary harmonic light from the undulator and lowers the temperature of the irradiated sample surfaces. The monochromator can be operated in a high vacuum, and three different mirror pairs are available for different experimental energy ranges; they can be exchanged without exposing the monochromator to the atmosphere. Measurements of the photon current of a photodiode on the sample stage indicated that the photon flux of the monochromatic beam was more than 10(14) photons s(-1) cm(-2) in the energy range 80-400 eV and 10(13) photons s(-1) cm(-2) in the energy range 400-800 eV. Thus, BLO7A is capable of performing SR-stimulated process experiments.
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关键词
monochromatic high photon flux, soft X-rays, undulator, multi-layered-mirror monochromator, SR process
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