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Transmission Electron Microscopy01:15

Transmission Electron Microscopy

In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400 keV in...

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Automated Delivery of Microfabricated Targets for Intense Laser Irradiation Experiments
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Published on: January 28, 2021

Few-cycle laser-driven electron acceleration.

K Schmid1, L Veisz, F Tavella

  • 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany. karl.schmid@mpq.mpg.de

Physical Review Letters
|April 28, 2009
PubMed
Summary
This summary is machine-generated.

We developed a novel electron accelerator using low-energy, few-cycle laser pulses. This compact system produces high-quality, monoenergetic electron beams for diverse applications.

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Area of Science:

  • * Plasma Physics
  • * Accelerator Physics
  • * Laser-driven particle acceleration

Background:

  • * Laser-driven electron acceleration typically requires high laser pulse energy.
  • * Few-cycle laser pulses offer unique interaction dynamics not fully explored for acceleration.
  • * Existing laser-based accelerators face challenges in size and user-friendliness.

Purpose of the Study:

  • * To investigate electron acceleration using a low-energy, few-cycle laser system.
  • * To characterize the properties of electron beams produced in this unexplored parameter regime.
  • * To assess the potential of this technology for practical applications and future development.

Main Methods:

  • * Employed a few-cycle (8 fs FWHM) laser system with 40 mJ pulse energy.
  • * Utilized laser-driven acceleration principles to generate electron beams.
  • * Characterized electron spectra, energy, and beam divergence using diagnostic tools.
  • * Operated the accelerator at a 10 Hz repetition rate.

Main Results:

  • * Achieved monoenergetic electron spectra in the tens-of-MeV range.
  • * Produced electron beams virtually free of low-energy, thermal electrons.
  • * Demonstrated a low electron beam divergence of 5-10 mrad.
  • * Established routine 10 Hz operation of the accelerator.

Conclusions:

  • * Few-cycle laser pulses at moderate energies can efficiently drive electron acceleration.
  • * The developed accelerator provides high-quality electron beams suitable for various applications.
  • * The system's scalability in repetition rate and energy points towards user-friendly laser-based accelerators.