Tanaka Shotaro, Suzuki Shuto, Mishima Tomohiro, Kanda Kazuhiro
Laboratory of Advanced Science and Technology for Industry, University of Hyogo, 3-1-2 Koto, Kamigori, Ako, Hyogo 678-1205, Japan.
J Synchrotron Radiat. 2021 Mar 1;28(Pt 2):618-623. doi: 10.1107/S1600577520016781. Epub 2021 Feb 11.
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 high-photon-flux light in the soft X-ray region. A new integrated computing multi-layered-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 photons s cm in the energy range 80-400 eV and 10 photons s cm in the energy range 400-800 eV. Thus, BL07A is capable of performing SR-stimulated process experiments.
软X射线比其他任何形式的光都能更有效地激发材料的内壳层。利用内壳层激发来研究同步辐射（SR）过程，要求光束线在软X射线区域提供单色且高光子通量的光。一台新型集成计算多层镜（MLM）单色仪安装在了NewSUBARU的07A光束线（BL07A）上，该光束线有一个3米长的波荡器作为光源，用于高光子通量单色光的辐照实验。MLM单色仪在软X射线区域具有高反射率指数；它能消除来自波荡器的不必要谐波光，并降低被辐照样品表面的温度。该单色仪可在高真空环境下运行，有三对不同的镜子可供不同的实验能量范围使用；更换镜子时无需将单色仪暴露于大气中。对样品台上光电二极管的光子电流测量表明，在80 - 400电子伏特能量范围内，单色光束的光子通量超过10¹⁰光子·秒⁻¹·厘米⁻²，在400 - 800电子伏特能量范围内为10⁹光子·秒⁻¹·厘米⁻²。因此，BL07A能够进行SR激发过程实验。
