Tunable Plasma-Based Energy Dechirper

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.