Daisy: Data analysis integrated software system for X-ray experiments

Daisy (Data Analysis Integrated Software System) has been designed for the analysis and visualisation of X-ray experiments. To address the requirements of the Chinese radiation facilities community, spanning an extensive range from purely algorithmic problems to scientific computing infrastructure, Daisy sets up a cloud-native platform to support on-site data analysis services with fast feedback and interaction. Furthermore, the plug-in based application is convenient to process the expected high throughput data flow in parallel at next-generation facilities such as the High Energy Photon Source (HEPS). The objectives, functionality and architecture of Daisy are described in this article.

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The HEPS project

Journal of Synchrotron Radiation ◽

10.1107/s1600577518012110 ◽

2018 ◽

Vol 25 (6) ◽

pp. 1611-1618 ◽

Cited By ~ 30

Author(s):

Yi Jiao ◽

Gang Xu ◽

Xiao-Hao Cui ◽

Zhe Duan ◽

Yuan-Yuan Guo ◽

...

Keyword(s):

Storage Ring ◽

High Energy ◽

High Energy Photon ◽

Energy Photon ◽

High Brightness ◽

X Ray ◽

Longitudinal Gradients ◽

Beijing China ◽

Photon Source ◽

Central Slice

The High Energy Photon Source (HEPS), a 6 GeV green-field diffraction-limited storage ring light source, will be built in Beijing, China. The HEPS design has been evolving for about ten years, and is now mostly finished and ready for construction. The storage ring is based on a modified hybrid seven-bend achromat (7BA) design, where bending magnets with reverse bending angles and longitudinal gradients are adopted to reach an ultralow natural emittance of 34.2 pm with a circumference of 1360.4 m. The central slice of the dipole in the middle of the modified hybrid 7BA, with flexible magnetic field, is used as the source of the bending-magnet beamline. Moreover, alternating high- and low-beta sections are specially designed to generate and deliver X-ray synchrotron radiation with high brightness of 5 × 1022 photons s−1 mm−2 mrad−2 (0.1% bandwidth)−1. Here, the HEPS storage ring design and solutions to the challenges inherent in this ultralow-emittance design are presented.

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Proposal for a photoelectron spectroscopy and microscopy beamline (0.5–11 keV) at the High Energy Photon Source

Journal of Synchrotron Radiation ◽

10.1107/s1600577519000523 ◽

2019 ◽

Vol 26 (2) ◽

pp. 559-564

Author(s):

Kun Tang ◽

Lei Zheng ◽

Jia-Ou Wang ◽

Yi-Dong Zhao

Keyword(s):

Energy Range ◽

Photoelectron Spectroscopy ◽

Optical Design ◽

High Energy ◽

High Energy Photon ◽

Energy Photon ◽

Optical Efficiency ◽

X Ray ◽

Entire Energy Range ◽

Photon Source

An optical design study of a beamline proposed for the new 6 GeV synchrotron, the High Energy Photon Source (HEPS), to be built in Beijing, China, is described. The beamline is designed to cover an energy range from 0.5 to 11 keV with two experimental stations, one for X-ray photoelectron spectroscopy (PES) experiments and the other for photoelectron emission microscopy (XPEEM) experiments. A 5 m APPLE II-type undulator with a relatively long magnetic period (55 mm) is used as the only radiation source. To optimize the optical efficiency for the full energy range, the beamline is split into a soft X-ray branch that is based on a variable-line-spacing plane-grating monochromator and a tender X-ray branch that uses a four-bounce monochromator with three Si channel-cut pairs. To allow both PES and XPEEM to be performed over the entire energy range, two toroidal mirrors and a bendable KB mirror pair are employed to deliver the soft and tender beams, respectively, to either of two experimental stations.

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