A new practical design of a merged APPLE-Knot undulator for High Energy Photon Source

Yang, Yanwei; Li, Xiaoyü; Lu, Huihua; Huang, Yunhua; Sun, Shuchen; Yu-rong, Sun; Li, Yuhui; Zhang, Lei; Zhao, Shutao; Chen, Wan; Gong, Lingling; Li, Zhiqiang; Guo, Qing; Gong, Keyun; Zhang, Xiangzhen

doi:10.1016/j.nima.2022.166816

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…Symmetrical merged four-row APPLE-Knot undulator magnetic field design has been reported in another paper [3], broadly speaking, this magnetic field can reduce the on axis heat load as much as possible, and generate polarization adjustable and high flux synchrotron radiation. Meanwhile, the polarization dropping in vertical polarization model has been addressed and the field integrals are easier to tunning.…”

Section: Magnetic Blocks Manufacture and Assemblementioning

confidence: 98%

“…In initial design scheme, an aluminum girder is connected to back beam by only one guide rail and eighteen sliders, a two-period test piece has been manufactured, we have found that the clearance between arrays fluctuates from 1 mm to 1.4 mm in different polarization model, the clearance has changed 0.4 mm, which is unacceptable. In sight of this, a two guide rails scheme has been put forward (figure 8), each aluminum girder is connected to back beam by two guide rails (such as guide rail 2 and 3) and thirty-six sliders, the preloading class also increased by one grade, then a new one-period test piece has been manufactured, the clearance fluctuated 0.12 mm when changed from horizontal polarization model to vertical polarization model [3], the improvement is evident, and the two guide rails scheme has been adopted, on the full four-row APPLE-Knot undulator this clearance between arrays is found to fluctuate within 0.1 mm. The fluctuation of the clearance between arrays is influenced by three factors.…”

Section: Jinst 18 T12006mentioning

confidence: 99%

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The manufacture and magnetic field tuning of a merged four-row APPLE-Knot undulator at HEPS

Huang,

Li,

et al. 2023

J. Inst.

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A merged four-row APPLE-Knot undulator has been manufactured at the High Energy Photon Source(HEPS) and the magnetic field tunning has been completed. Inclined magnetization magnetic blocks are used in this undulator in large scale, new skills are used in magnetic blocks' manufacturing and assembling. Magnet field tunning is conducted by combination of various methods and resulted in a satisfactory photon performance. The practical mechanical deformation of aluminum girder has been measured and compared with theoretical calculation, results indicate a significant discrepancy between these two data, the reasons causing this discrepancy have also been analyzed. The merged four-row APPLE-Knot undulator at HEPS holds significant reference value for its uniqueness and specificity.

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Section: Magnetic Blocks Manufacture and Assemblementioning

confidence: 98%

Section: Jinst 18 T12006mentioning

confidence: 99%

The manufacture and magnetic field tuning of a merged four-row APPLE-Knot undulator at HEPS

Huang,

Li,

et al. 2023

J. Inst.

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“…Yang et al proposed a new structure to solve this problem by adjusting the size of the merged magnets without the shift of Knot rows and this method can also remedy the drop of polarization in vertical polarization mode. [10] For soft x-ray beamline in a medium energy ring, for example, a 3 GeV ring, because the K value needed is not so high, whether the APPLE-Knot undulator still excels APPLE undulator and what structure has better performance needs to be studied. Here the performance of APPLE-Knot undulator to generate soft x-ray in a 3.0 GeV storage ring is studied.…”

Section: Introductionmentioning

confidence: 99%

Performance of the merged APPLE-Knot undulator for soft x-ray beamline in medium energy ring

Cheng 成,

Zhang 张,

Zha 查

et al. 2023

Chinese Phys. B

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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.

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“…A high-energy photon source (HEPS) is one of the major scientific engineering projects and a fourth-generation Synchrotron light source with the highest brightness in the world [7,8]. HEPS has led to the progress of a series of disciplines, including ultrafast biology, materials science, nonlinear Quantum electrodynamics and nuclear spectroscopy [9][10][11][12][13][14][15][16][17]. At present, a high-energy photon source exists in large acceleration facilities in the form of a X-ray freeelectron laser or Synchrotron.…”

Section: Introductionmentioning

confidence: 99%

Highly Collimated Monochromatic X-rays Generated by Collision of High-Energy Electrons with Tightly Focused Linearly Polarized Laser Pulse

Zeng,

Zhang,

Chang

et al. 2023

Crystals

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This article delves into the generation and modulation process of X-rays as high-energy photon sources. Using the principles of classical electrodynamics, this study enables nonrelativistic short pulse lasers to collide with high-energy electrons while the collision center is away from the focal point. This scattering method may produce X-rays with good collimation and monochromaticity, and it progressively approaches inverse Thomson scattering. We studied and analyzed the effects of different electron characteristics and laser parameter settings on the high-energy angular distribution and spectrum of X-rays, especially the setting of the collision center and initial electron velocity, as well as the setting of laser intensity and pulse width. Linear polarized laser pulses with relativistic intensity can generate discrete supercontinuum X-rays with spectral distortion. In addition, the relationships between electronic and laser properties and radiation energy were also studied. Our research can provide valuable insights for manipulating collimated or distorted, monochromatic, or tunable X-rays, as well as understanding their properties.

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A new practical design of a merged APPLE-Knot undulator for High Energy Photon Source

Cited by 5 publications

References 9 publications

The manufacture and magnetic field tuning of a merged four-row APPLE-Knot undulator at HEPS

The manufacture and magnetic field tuning of a merged four-row APPLE-Knot undulator at HEPS

Performance of the merged APPLE-Knot undulator for soft x-ray beamline in medium energy ring

Highly Collimated Monochromatic X-rays Generated by Collision of High-Energy Electrons with Tightly Focused Linearly Polarized Laser Pulse

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