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Generating Single-Spike Hard X-Ray Pulses with Nonlinear Bunch Compression in Free-Electron Lasers.

S Huang¹, Y Ding², Y Feng²

¹Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China.

Physical Review Letters

|October 28, 2017

Summary

This summary is machine-generated.

Researchers developed a simple method for generating single-spike hard x-ray pulses using nonlinear bunch compression at the Linac Coherent Light Source (LCLS). This technique, utilizing 20-pC bunch charge, produces ultrashort pulses for advanced scientific applications.

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Area of Science:

Physics
Materials Science
Chemistry

Background:

Free-electron lasers (FELs) are crucial for generating high-intensity X-rays.
Producing single-spike X-ray pulses is essential for advanced experiments requiring precise temporal resolution.

Purpose of the Study:

To develop a simple and effective method for generating single-spike hard X-ray pulses.
To demonstrate this method at the Linac Coherent Light Source (LCLS).

Main Methods:

Nonlinear bunch compression technique.
Utilizing a 20-pC bunch charge.
Demonstration in the hard X-ray regime at 5.6 and 9 keV.

Main Results:

Approximately 50% of FEL shots contained a single-spike spectrum.
Single-spike shots at 5.6 keV had a mean pulse energy of ~10 μJ with 70% intensity fluctuation.
Pulse duration (FWHM) was evaluated to be at the 200-attosecond level.

Conclusions:

The developed method is effective for generating single-spike hard X-ray pulses.
This advancement enables new possibilities in ultrafast X-ray science.
The LCLS can reliably produce ultrashort X-ray pulses for demanding applications.