Collimator system of SLEGS beamline at Shanghai Light Source

Hao, Zirui; Fan, Guoliang; Wang, H.W.; Liu, L.X.; Xu, H. S.; Utsunomiya, H.; Cao, Xuelei; Xu, Bin; Song, Liying; Hu, Xinrong; Li, X.X.; Yang, Yayun; Kuang, P.

doi:10.1016/j.nima.2021.165638

Cited by 26 publications

(10 citation statements)

References 14 publications

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“…Cu 20%). The first and second sets of shutters are rotated around the beam axis by 30°, shaping the beam spot into a regular dodecagon [24,25]. The aperture of the fine collimator can be changed continuously from 0 to 40 mm.…”

Section: Coarse and Fine Collimatorsmentioning

confidence: 99%

“…In the past decade, SINAP-II [15][16][17][18][19] and UVSOR-II have played a pioneering role in the technical development of slant scattering. While UVSOR-II has succeeded in producing MeV gamma rays at limited slant-scattering angles ranging from 70°to 110° [21,22], the gamma-ray beam production at SLEGS is systematically carried out in an innovative manner with a dedicated interaction chamber [23] and double collimator system [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Commissioning of laser electron gamma beamline SLEGS at SSRF

et al. 2022

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The Shanghai Laser Electron Gamma Source (SLEGS) is a powerful gamma source that provides MeV gamma-ray beams for nuclear science and technology. It was developed as one of the 16 beamline stations in the Phase II Project of the Shanghai Synchrotron Radiation Facility. The slant-scattering mode is for the first time systematically employed in laser Compton scattering at SLEGS to produce energy-tunable quasi-monoenergetic gamma-ray beams. The SLEGS officially completed its commissioning from July to December 2021. Gamma rays in the energy range of 0.25–21.7 MeV with a flux of 2.1 × 104–1.2 × 107 photons/s and an energy spread of 2–15% were produced during the test. This paper reports the results from commissioning the SLEGS beamline.

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Section: Coarse and Fine Collimatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Commissioning of laser electron gamma beamline SLEGS at SSRF

et al. 2022

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“…The main component of the background radiation is keV X rays. Fine pencil-like gamma-ray beams with the background radiation are produced by the collimator system [22]. Background gamma events are produced in the atomic interaction (Compton scattering) of the pencil-like beam hitting the 100 µm target foil.…”

Section: Background γ Eventsmentioning

confidence: 99%

“…( 1), we treat one neutron branching to an excited state in 180 Ta followed by the detection of two γ rays, γ 1 and γ 2 , out of m γ rays in coincidence as represented by m C 2 =m(m − 1)/2. When one performs an experiment with the chaser detector of Type I or Type II at 10 MeV with a flux of 10 5 photons/s [22,23] and a Ta foil of 100 µm thickness under the conditions listed in Table 1, one finds the event rate summarized in Table 2. In this estimate, we assumed for simplicity that the neutron energy E n =1 MeV, the γ-ray energy E γ =200 keV, the branching ratio b= 0.2, and the neutron multiplicity m=7.…”

Section: Event Ratementioning

confidence: 99%

p-process chaser detector in $n$-$γ$ coincidences

Utsunomiya,

Hao,

Goriely

et al. 2022

Preprint

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We propose two types of neutron-γ 1 -γ 2 triple coincidence detectors (not constructed) to chase gamma transitions to produce p-nuclei following the neutron emission in the (γ, n) reaction. Neutrons are detected with 24 3 He counters embedded in a polyethylene moderator in Type I detector and with 6 liquid scintillation detectors in Type II detector, respectively. γ rays are detected with two high-purity germanium detectors and four LaBr 3 (Ce) detectors. The detector which is referred to as p-process chaser detector is used to search for mediating states in 180 Ta through which the isomeric and ground states in 180 Ta are thermalized in the p-process. A search is made for both resonant states and unresolved states in high nuclear-level-density domain.

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Section: Background 𝛾 Eventsmentioning

confidence: 99%