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The universe is composed of matter in different forms, and all forms of matter contain energy. The different forms of energy on Earth originate from the Sun — the ultimate energy source. Plants capture light energy from the Sun, and, via the process of photosynthesis, convert it into chemical energy. This stored energy from plants can be harnessed in many ways. For example, eating plant products as food provides energy for our body to function, and burning wood or coal (fossilized...

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Related Experiment Video

Updated: Jan 29, 2026

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Published on: August 1, 2017

Tunable Plasma-Based Energy Dechirper.

R D'Arcy¹, S Wesch¹, A Aschikhin^1,2

¹Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany.

Physical Review Letters

|February 9, 2019

Summary

This summary is machine-generated.

A new tunable plasma dechirper successfully reduced electron bunch energy spread from 1.31% to 0.33% at FLASHForward. This breakthrough in plasma wakefield acceleration shows promise for future particle accelerators and free-electron lasers.

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Last Updated: Jan 29, 2026

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Area of Science:

Plasma physics
Particle acceleration
Accelerator physics

Background:

Correlated energy spread in electron bunches limits performance in accelerators.
Existing methods for chirp removal are often complex or inefficient.

Purpose of the Study:

To develop and demonstrate a tunable plasma-based energy dechirper.
To reduce the projected energy spread of a high-energy electron bunch.

Main Methods:

Utilized a tunable plasma-based energy dechirper at the FLASHForward facility.
Interacted a 681 MeV electron bunch with plasma-excited wakefields.
Varied plasma density to optimize dechirping performance.

Main Results:

Reduced projected energy spread from 1.31% to 0.33% Full Width at Half Maximum (FWHM).
Maintained the stability of the electron beam during the dechirping process.
Achieved a dechirping strength of 1.8 GeV/mm/m, exceeding current techniques.

Conclusions:

The tunable plasma dechirper effectively removes correlated energy spread.
Experimental results align with theoretical predictions and simulations.
This technique is a promising solution for future high-energy physics facilities and plasma wakefield-based free-electron lasers.