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Area of Science:

  • Accelerator Physics
  • Particle Beam Dynamics

Background:

  • Longitudinal electron beam properties are critical for advanced accelerators like storage rings, free electron lasers, and energy recovery linacs.
  • Nondestructive, shot-by-shot bunch length measurements are vital for online machine control and stable operation.
  • Current methods using coherent radiation power offer simple, robust control but typically provide only relative bunch length estimations.

Purpose of the Study:

  • To present a novel experimental methodology for self-calibrating equipment used in measuring electron beam bunch length.
  • To enable absolute, rather than relative, bunch length measurements for improved accelerator control.

Main Methods:

  • Development of a self-calibrating technique using diffraction radiation from a gap.
  • Measurement of the second-order moment of the longitudinal electron beam distribution.
  • Validation of the theoretical approach through a comprehensive measurement campaign.

Main Results:

  • Demonstration of a novel method for self-calibration of bunch length measurement equipment.
  • Successful measurement of the second-order moment of the longitudinal distribution, enabling absolute bunch length determination.
  • Experimental validation of the proposed theoretical framework.

Conclusions:

  • The presented methodology offers a robust and simple solution for absolute bunch length measurements in accelerators.
  • This self-calibration technique enhances the operational control and stability of various frontier accelerator facilities.
  • The findings contribute to the advancement of nondestructive diagnostic tools for particle beams.