JJAP Conf. Proc. 7, 011301 (2018) doi:10.7567/JJAPCP.7.011301
Progress report on construction of a low-energy positron diffraction (LEPD) experiment station at KEK
- 1Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, Takasaki, Gunma 370-1292, Japan
- 2National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
- 3Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- 4Department of Applied Chemistry, Chiba University, Inage, Chiba 263-8522, Japan
- 5Department of Physics, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan
- Received October 02, 2017
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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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