Knot Undulator to Generate Linearly Polarized Photons with Low on-Axis Power Density

[摘要] Heat load on beamline optics is a serious problem to generate pure linearly polarized photons in the third generation synchrotron radiation facilities. For permanent magnet undulators, this problem can be overcome by a figure-8 operating mode. But there is still no good method to tackle this problem for electromagnetic elliptical undulators. Here, a novel operating mode is suggested, which can generate pure linearly polarized photons with very low on-axis heat load. Also the available minimum photon energy of linearly polarized photons can be extended much by this method.

[发布日期] 2009-06-19

[学科分类] 核物理和高能物理

[关键词] OPTICS;PERMANENT MAGNETS;PHOTONS;POWER DENSITY;SYNCHROTRON RADIATION;WIGGLER MAGNETS General Physics;OTHER