SPring-8 LEPS2 beamline: A facility to produce a multi-GeV photon beam via laser Compton scattering

SPring-8 LEPS2 beamline: A facility to produce a multi-GeV photon beam via laser Compton scattering
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SPring-8 LEPS2 光束线:通过激光康普顿散射产生多 GeV 光子束的设施

DOI:
10.1016/j.nima.2022.166677
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发表时间:
2022
期刊:
Nuclear Instruments and Methods A
影响因子:
--
通讯作者:
N. Muramatsu et al.
N. Muramatsu et al.
中科院分区:
--
文献类型:
--
作者:
Atsushi Sato;Mayu Motohashi;Yihuang Wang;Dong Xue;Tomoya Nakamura;Atsushi Wakamiya;Kazuhiro Marumoto;N. Muramatsu et al.

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我们已经建立了一个新的激光康普顿散射设施,称为LEPS 2光束线,在8 GeV的电子存储环,SPring-8。该设施提供了一个线性偏振的光子束的标记能量范围为1.3-2.4 GeV。由于低发射率储存环电子的小发散,即使在其行进约130 m到独立于储存环建筑物并包含大型检测器系统的实验建筑物之后,标记光子束的尺寸(σ)也被抑制到约4 mm。该光束线被设计为通过采用最多四个高功率激光束的同时注入并将长光子束路径的透射率提高到约77%来实现比SPring-8处的第一激光康普顿散射光束线的光子束强度更高的光子束强度。这条新的光束线正在强子光生实验中运行。
We have constructed a new laser-Compton-scattering facility, called the LEPS2 beamline, at the 8 GeV electron storage ring, SPring-8. This facility provides a linearly polarized photon beam in a tagged energy range of 1.3–2.4 GeV. Thanks to a small divergence of the low-emittance storage-ring electrons, the tagged photon beam has a size (σ) suppressed to about 4 mm even after it travels about 130 m to the experimental building that is independent of the storage ring building and contains large detector systems. This beamline is designed to achieve a photon beam intensity higher than that of the first laser-Compton-scattering beamline at SPring-8 by adopting the simultaneous injection of up to four high-power laser beams and increasing a transmittance for the long photon-beam path up to about 77%. The new beamline is under operation for hadron photoproduction experiments.
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