Progress report on construction of a low-energy positron diffraction (LEPD) experiment station at KEK

Ken Wada; Tetsuroh Shirasawa; Izumi Mochizuki; Masanori Fujinami; Toshio Takahashi; Masaki Maekawa; Atsuo Kawasuso; Masao Kimura; Toshio Hyodo

doi:10.56646/jjapcp.7.0_011301

3rd China-Japan Joint Workshop on Positron Science (JWPS2017)

Session ID : 011301

DOI https://doi.org/10.56646/jjapcp.7.0_011301

Conference information

Host: The organizing committee of JWPS2017

Name : 3rd China-Japan Joint Workshop on Positron Science (JWPS2017)

Location : Hefei, China

Date : June 08, 2017 - June 10, 2017

Advances in analytical techniques and instrumentation

Progress report on construction of a low-energy positron diffraction (LEPD) experiment station at KEK

Ken Wada, Tetsuroh Shirasawa, Izumi Mochizuki, Masanori Fujinami, Toshio Takahashi, Masaki Maekawa, Atsuo Kawasuso, Masao Kimura, Toshio Hyodo

Author information

Ken Wada
Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, Takasaki, Gunma 370-1292, Japan
Tetsuroh Shirasawa
National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
Izumi Mochizuki
Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
Masanori Fujinami
Department of Applied Chemistry, Chiba University, Inage, Chiba 263-8522, Japan
Toshio Takahashi
Department of Physics, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan
Masaki Maekawa
Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, Takasaki, Gunma 370-1292, Japan
Atsuo Kawasuso
Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, Takasaki, Gunma 370-1292, Japan
Masao Kimura
Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
Toshio Hyodo
Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan

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Details

Abstract

A low-energy positron diffraction (LEPD) experiment station was developed at the Slow Positron Facility, High Energy Accelerator Research Organization (KEK). An electron-accelerator-based slow-positron beam with an energy of 5 keV was magnetically transported and focused on a transmission-type Ni remoderator to achieve a 50 eV–500 eV brightness-enhanced beam in a non-magnetic space. A LEPD detector with center holed retarding meshes, Chevron-type microchannel plates, and a delay-line detector (DLD) was installed. A newly developed pulse stretching system was used to stretch the initial positron-pulse width of 1.2 µs to 200 µs–20 ms to avoid multiple hit events within the position analysis time of the DLD.

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