Simple scheme for harmonic suppression by undulator segmentation

Area of Science:

• * Physics, specifically synchrotron radiation and accelerator physics.
• * Optics and beamline instrumentation for particle accelerators.

Background:

• * Harmonic intensity suppression is crucial for optimizing undulator radiation applications.
• * Existing methods like detuning are limited by electron beam properties and beamline acceptance, especially for long undulators.

Purpose of the Study:

• * To investigate the effectiveness of a detuning-like scheme for harmonic suppression in undulator radiation.
• * To propose and evaluate a novel, simple scheme for harmonic suppression in long undulators.

Main Methods:

• * Theoretical investigation of a detuning technique, considering electron beam emittance and beamline angular acceptance.
• * Development and analysis of a segmented undulator scheme with adjustable optical phase between segments.

Main Results:

• * The detuning technique is effective only for undulators with a small number of periods.
• * The proposed segmented undulator scheme effectively shifts the fundamental energy.
• * The segmented undulator scheme minimally affects other harmonic intensities.

Conclusions:

• * A simple segmented undulator scheme offers an effective solution for harmonic suppression in long undulators.
• * This method provides better control over undulator radiation spectra compared to traditional detuning techniques under realistic conditions.