Stable sub-micrometre high-flux probe for soft X-ray ARPES using a monolithic Wolter mirror

Yasunori Senba; Hikaru Kishimoto; Yoko Takeo; Hirokatsu Yumoto; Takahisa Koyama; Hidekazu Mimura; Haruhiko Ohashi

doi:10.1107/S1600577520007274

Stable sub-micrometre high-flux probe for soft X-ray ARPES using a monolithic Wolter mirror

J Synchrotron Radiat. 2020 Sep 1;27(Pt 5):1103-1107. doi: 10.1107/S1600577520007274. Epub 2020 Jul 10.

Authors

Yasunori Senba¹, Hikaru Kishimoto¹, Yoko Takeo¹, Hirokatsu Yumoto¹, Takahisa Koyama¹, Hidekazu Mimura², Haruhiko Ohashi¹

Affiliations

¹ Light Source Division, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan.
² Department of Precision Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Abstract

A focusing optics that can provide a sub-micrometre high-flux probe for soft X-ray micrometre-scale angle-resolved photoemission spectroscopy (ARPES) is proposed. A monolithic Wolter-type mirror with a large acceptance, achromatism and small comatic aberration was designed and evaluated. A focused beam size of 0.4 µm (vertical) × 4 µm (horizontal), a high throughput of 59% and a high tolerance of 1.6 mrad to the pitching error were realized at a photon energy of 1000 eV. A Wolter-type mirror can be practically employed as a stable sub-micrometre focusing mirror with high throughput in ARPES applications.

Keywords: ARPES; Wolter mirror; focusing optics; monolithic; soft X-rays.

open access.