Knot undulator to generate linearly polarized photons with low on-axis power density

TL;DR

This paper proposes a novel operating mode for electromagnetic elliptical undulators that produces linearly polarized photons with significantly reduced on-axis heat load and extends the minimum photon energy, addressing a key challenge in synchrotron radiation facilities.

Contribution

A new operating mode for electromagnetic elliptical undulators that reduces heat load and extends photon energy range, improving performance in synchrotron radiation applications.

Findings

Reduces heat load on beamline optics.

Extends minimum photon energy for linearly polarized photons.

Enables more efficient generation of polarized light.

Abstract

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.