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A novel nondestructive diagnostic method for mega-electron-volt ultrafast electron diffraction.

Xi Yang1, Junjie Li2, Mikhail Fedurin2

  • 1Brookhaven National Laboratory, Upton, NY, 11973, USA. xiyang@bnl.gov.

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|November 22, 2019
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Summary
This summary is machine-generated.

This study introduces a real-time monitor for ultrafast electron beams, measuring energy and pointing jitter using Bragg diffraction patterns. This technique enhances ultrafast electron diffraction (UED) and microscopy (UEM) experiments by enabling online optimization and data filtering.

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Area of Science:

  • Physics
  • Materials Science
  • Electron Microscopy

Background:

  • Ultrafast electron diffraction (UED) and ultrafast electron microscopy (UEM) are powerful techniques for studying material dynamics.
  • Accurate monitoring of electron beam properties, such as energy and spatial pointing, is crucial for high-resolution UED/UEM experiments.
  • Current diagnostics often lack real-time capabilities or are limited in scope.

Purpose of the Study:

  • To experimentally verify a real-time, nondestructive monitor for electron beam energy, energy spread, and spatial-pointing jitter.
  • To enable online optimization of electron beams for advanced UED and UEM applications.
  • To improve the resolution of time-resolved UED experiments through real-time data filtering.

Main Methods:

  • Encoding electron beam energy and spatial-pointing jitter information into Bragg-diffracted mega-electron-volt ultrafast electron diffraction patterns.
  • Decomposing shot-to-shot diffraction pattern fluctuations into radial (energy/energy spread) and drift (spatial-pointing jitter) modes.
  • Utilizing the decoupled nature of these modes for simultaneous and precise measurement.

Main Results:

  • Simultaneous measurement of shot-to-shot energy fluctuation with 2·10-4 precision via the radial mode.
  • Measurement of spatial-pointing jitter with a wide span (10-4 to 10-1) via the drift mode.
  • Demonstration of real-time energy spread extraction and online beam optimization capabilities.

Conclusions:

  • The developed Bragg-diffraction method provides a real-time, nondestructive, and highly precise diagnostic for electron beams.
  • This technique is broadly applicable to the UED user community, enhancing experimental resolution and enabling advanced applications.
  • It offers significant advantages over traditional accelerator-based electron beam diagnostics for UED and UEM.