Knot undulator to generate linearly polarized photons with low on-axis power density.
Heat load on beamline optics is a serious obstacle for devices designed to generate pure linearly polarized photons in third generation synchrotron radiation facilities. For permanent magnet undulators, this problem can be overcome by implementing a figure-eight design configuration. As yet there has been no good method to tackle this problem for electromagnetic elliptical undulators. Here, a novel design and operational mode is suggested, which can generate pure linearly polarized photons with very low on-axis heat load. Additionally, the minimum photon energy capability of linearly polarized photons can be significantly extended by this method.
Qiao
S
S
Department of Physics, Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China.
Ma
Dewei
D
Feng
Donglai
D
Marks
S
S
Schlueter
R
R
Prestemon
S
S
Hussain
Z
Z