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Femtosecond Compression Dynamics and Timing Jitter Suppression in a THz-driven Electron Bunch Compressor.

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This study demonstrates THz-driven electron beam compression and timing stabilization. The technique significantly shortens bunch length and reduces timing jitter for ultrafast science applications.

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Area of Science:

  • Accelerator Physics
  • Ultrafast Science
  • Terahertz Science

Background:

  • Relativistic electron beams are crucial for advanced scientific applications.
  • Achieving precise control over electron beam properties, such as bunch length and timing jitter, is essential for high-resolution measurements.
  • Existing methods for electron beam manipulation face limitations in achieving femtosecond-level precision.

Purpose of the Study:

  • To demonstrate the first Terahertz (THz) driven bunch compression of a relativistic electron beam.
  • To achieve timing stabilization of the electron beam using THz radiation.
  • To assess the performance improvement for applications requiring femtosecond electron beams.

Main Methods:

  • Utilizing quasi-single-cycle strong field THz radiation.
  • Employing a shorted parallel-plate structure for beam manipulation.
  • Compressing a few-fC electron beam with 2.5 MeV kinetic energy.

Main Results:

  • Achieved a factor of 2.7 bunch compression.
  • Produced a 39 fs root-mean-square (rms) bunch length.
  • Reduced timing jitter by more than a factor of 2, achieving 31 fs rms.

Conclusions:

  • The THz-driven technique offers a significant advancement in electron beam performance.
  • This method provides a critical step towards unprecedented timing resolution in ultrafast sciences.
  • The technique is applicable to ultrafast electron diffraction and other applications utilizing femtosecond electron beams.