Soft-x-ray coherent radiation using a single-cascade free-electron laser.

Area of Science:

• Physics
• Laser Science
• X-ray Optics

Background:

• Coherent harmonic generation (CHG) is crucial for producing coherent radiation.
• Free-electron lasers (FELs) offer a pathway to generate radiation in the vacuum ultraviolet (VUV) and X-ray spectral regions.
• Existing methods for CHG face challenges in achieving high power and specific spectral ranges.

Purpose of the Study:

• To propose a straightforward method for generating powerful coherent radiation in the soft X-ray region.
• To leverage existing free-electron laser technology for enhanced X-ray generation.
• To demonstrate the feasibility of the proposed scheme through theoretical modeling and simulations.

Main Methods:

• Developing a scheme for substantial bunching in a relativistic electron beam.
• Implementing methods to limit the energy spread growth within the electron beam.
• Validating the scheme using one-dimensional (1D) models and confirming with three-dimensional (3D) simulations.

Main Results:

• The proposed scheme enables the generation of powerful coherent radiation in the soft X-ray spectrum.
• Substantial electron beam bunching was achieved while controlling energy spread.
• Simulation results confirmed the validity and effectiveness of the proposed method.

Conclusions:

• The presented scheme offers a practical approach to generating high-power coherent soft X-ray radiation.
• This method utilizes current free-electron laser technology, making it readily implementable.
• The findings pave the way for advancements in coherent X-ray sources for various scientific applications.