Subjects: Physics >> Nuclear Physics submitted time 2024-07-13
Abstract： Abstract [Background]: The indirect non-destructive measurement of accelerator electron beam parameters has been a challenge, and the traditional methods using X-ray pinhole imaging on a storing ring or slit diffraction on a linear accelerator have their own shortcomings. Laser Compton Scattering (LCS) device is a new type of a light source producing a high-energy γ beam by the interaction of relativistic electrons and low-energy photons. [Purpose]: To extract the SSRF electron beam parameters based on the LCS techniques. [Method]: This study aims to search for the simulated spectrum, reconstructed by the Monte Carlo simulation program based on Geant4, that best matches the experimental energy spectrum. Then the corresponding parameters are extracted, which include the horizontal beam size, energy, and emittance. The consistency of the gamma energy spectrum at different colliding angles measured on the Shanghai Laser Electron Gamma Source (SLEGS) beamline station of Shanghai Synchrotron Radiation Facility (SSRF) is verified. [Results]: The extracted electron beam parameters of the Shanghai Light Source storing ring are in good agreement with the theoretical values. [Conclusion]: It proves that Laser Compton scattering to be an effective and non-destructive way to determine the electron beam parameters indirectly and lays a stable foundation for the extraction of other parameters of the electron beam.
Subjects: Physics >> Nuclear Physics submitted time 2024-02-28
Xu Hanghua
Liu Longxiang
Zhang Yue
Hao Zirui
Yang Yuxuang
Jin Sheng
Chen Kaijie
Li Zhicai
Jiao Pu
Zhou Mengdie
Wang Zhenwei
Wang Hongwei
Fan Gongtao
Abstract： : Introduces the construction and trial operation of Shanghai Laser Electron Gamma Source (SLEGS) beamline station, one
of the Shanghai light source(SSRF) projects II, which can carry out basic research on nuclear physics and nuclear astrophysics, and
carry out applied research such as gamma irradiation, gamma imaging and gamma activation at SLEGS gamma source. The SLEGS
beamline station passed the process acceptance in December 2021, entered the trial operation stage in October 2022, and have open
to users in September 2023. SLEGS is the first in the world to use the continuous collision angle mode to change the energy of the
gamma beam, with the best energy scanning accuracy, flow intensity density and efficient energy regulation ability. In the trial
operation stage, the SLEGS beamline station focused on solving the problem of online monitoring of gamma beam energy spectrum
and flow intensity, mainly completed the experimental methodology research of optical neutron cross-section measurement by flat
efficiency spectrometer (FED), and carried out the expansion and research of application platforms such as gamma imaging, gamma
activation, and positron source generation. With the development of inverse Compton scattering techniques, short-pulse,
high-polarization, high-throughput, and miniaturized laser Compton scattering light sources will usher in better development
opportunities in the future, and will play an important role in nuclear physics, astrophysics, particle physics, polarization physics, as
well as aerospace, medical testing, energy development and other gamma source application research fields.
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