Development of a linac-based LEPD experimental station for surface structure analysis and coordination with synchrotron radiation ARPES

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-04-01 Epub Date: 2025-02-04 DOI:10.1016/j.nima.2025.170270

Rezwan Ahmed , Izumi Mochizuki , Toshio Hyodo , Tetsuroh Shirasawa , Seigi Mizuno , Yoshinari Kondo , Kenichi Ozawa , Miho Kitamura , Kenta Amemiya , Bartlomiej Checinski , Jozef Ociepa , Achim Czasch , Ottmar Jagutzki , Ken Wada

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Abstract

We report on the development of a low-energy positron diffraction (LEPD) experimental station for surface structure analysis using a linear electron accelerator (linac)-based slow-positron beam. LEPD is the positron counterpart of low-energy electron diffraction (LEED) and is expected to offer higher accuracy in surface structure determination compared to LEED. The station enables acquisition of LEPD

I

–

V

curves within a few hours. It consists of two ultra-high vacuum (UHV) chambers for LEPD measurements and sample preparation, equipped with essential tools for surface preparation and evaluation. A newly designed sample holder has been developed to be compatible with this LEPD station at SPF-A4 of the Slow Positron Facility (SPF) and the angle-resolved photoemission spectroscopy (ARPES) station at BL-13B of the Photon Factory (PF), both located at the Tsukuba campus of the Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK). This system facilitates LEPD and ARPES measurements on the same sample under consistent surface conditions, achieved through identical preparation environments and procedures.

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基于直线机的LEPD表面结构分析与同步辐射ARPES协调实验站的研制

本文报道了利用线性电子加速器（linac）建立的低能量正电子衍射（LEPD）表面结构分析实验站。LEPD是低能电子衍射（LEED）的正电子对应，与LEED相比，有望在表面结构测定中提供更高的精度。该站可以在几小时内获取LEPD I-V曲线。它由两个用于LEPD测量和样品制备的超高真空（UHV）室组成，配备了用于表面制备和评估的基本工具。一种新设计的样品夹已经被开发出来，与位于慢正电子设施（SPF） SPF- a4的LEPD站和位于光子工厂（PF） BL-13B的角分辨光谱学（ARPES）站兼容，这两个站都位于材料结构科学研究所（IMSS）的校园，高能加速器研究组织（KEK）。该系统便于在一致的表面条件下对同一样品进行LEPD和ARPES测量，通过相同的制备环境和程序实现。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.