Performance of the merged APPLE-Knot undulator for soft x-ray beamline in medium energy ring
Rui Cheng(成锐)1,3, Fa-Yuan Zhang(张发远)1,2, He-Ming Zha(查鹤鸣)1,2, and Shan Qiao(乔山)1,2,3,†
1 National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China; 2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; 3 School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Abstract APPLE-Knot undulator can effectively solve the on-axis heat load problem and is proven to perform well in VUV beamline and soft x-ray beamline in high energy storage ring. However, for soft x-ray beamline in a medium energy ring, whether the APPLE-Knot undulator excels the APPLE undulator is still a question. Here, a merged APPLE-Knot undulator is studied to generate soft x-ray in a medium energy ring. Its advantages and problems are discussed. Though the on-axis heat load of the APPLE-Knot undulator is lower in linear polarization modes compared to the APPLE undulator, its flux is lower. The APPLE-Knot undulator shows no advantage when only fundamental harmonic is needed. However, in circular polarization mode, the APPLE-Knot undulator shows the ability to cover a broader energy range which can remedy the notable shortcoming of the APPLE undulator.
Rui Cheng(成锐), Fa-Yuan Zhang(张发远), He-Ming Zha(查鹤鸣), and Shan Qiao(乔山) Performance of the merged APPLE-Knot undulator for soft x-ray beamline in medium energy ring 2023 Chin. Phys. B 32 114102
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