期刊
NATURE PHOTONICS
卷 13, 期 9, 页码 629-635出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41566-019-0467-6
关键词
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资金
- DOE [DE-FG02-97ER41033, DE-SC000536]
- US Domestic Nuclear Detection Office, Academic Research Initiative [2010-DN-077-ARI-02, 2008-DN-077-ARI1010]
Polarized gamma-ray beams are a precise and selective probe for studying fundamental questions about nuclear structure and hadron properties. Improvements to this probe require new experimental approaches that can produce high-flux gamma-ray beams with easily switchable pure polarization states. Here, we report an optics-free method to precisely control the polarization of a Compton gamma-ray beam. Using a free-electron laser (FEL) oscillator with two helical undulator magnets of opposite helicities, we have produced a linearly polarized FEL beam with a variable polarization direction and an unprecedented degree of linear polarization, P-Lin = 0.997. With this FEL as a photon drive, we are able to generate Compton gamma-ray beams having either left/right-circular polarization or rotatable linear polarization. The linearly polarized gamma-ray beam has been characterized and shows P-Lin = 0.97. This demonstrated polarization control technique is well suited for high-flux gamma-ray production with any level of FEL power.
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