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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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Proof-of-principle experiment for laser-driven cold neutron source.

S R Mirfayzi1,2, A Yogo3, Z Lan3

  • 1Institute of Laser Engineering, Osaka University, Suita, Osaka, 565-0871, Japan. s.mirfayzi20@imperial.ac.uk.

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|November 20, 2020
PubMed
Summary
This summary is machine-generated.

Scientists developed a compact, table-top laser-driven neutron source. This innovative tool provides high-brightness cold neutrons for advanced materials research, enabling new scientific insights.

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Area of Science:

  • Nuclear physics
  • Materials science
  • Laser technology

Background:

  • Neutrons are crucial for probing matter's structure and properties.
  • Traditional neutron sources are large and complex.
  • Advancements in lasers enable novel, compact sources.

Purpose of the Study:

  • To develop a compact, table-top laser-driven neutron source.
  • To achieve high brightness and temporal resolution in neutron production.
  • To explore the potential of laser-driven neutrons for scientific discovery.

Main Methods:

  • Utilizing a pure hydrogen moderator at cryogenic temperatures.
  • Employing Monte Carlo techniques to evaluate neutron energies and beam duration.
  • Leveraging high repetition rate laser technology.

Main Results:

  • Measured a cold neutron flux of [Formula: see text]/pulse near the moderator.
  • Evaluated beam durations from hundreds of ns to tens of [Formula: see text].
  • Projected cold neutron flux of [Formula: see text] with the J-EPoCH laser.

Conclusions:

  • The developed table-top laser-driven neutron source shows significant promise.
  • This compact source offers a new capability for materials research.
  • Future upgrades will enhance cold neutron flux for broader applications.