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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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Neutron source reconstruction using a generalized expectation-maximization algorithm on one-dimensional neutron

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Magnetized Liner Inertial Fusion experiments successfully reconstructed neutron emission profiles. This advancement aids in understanding fusion plasma dynamics and improving magnetic fusion energy research.

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Area of Science:

  • Nuclear Fusion Science
  • Plasma Physics
  • Particle Diagnostics

Background:

  • Magnetized Liner Inertial Fusion (MLI) experiments at the Z facility utilize deuterium fuel.
  • Thermonuclear conditions in these experiments generate 2.45 MeV neutrons.
  • Understanding the spatial distribution of neutron production is crucial for fusion research.

Purpose of the Study:

  • To develop and validate a method for reconstructing the axial neutron emission profile of fusion plasmas.
  • To analyze the spatial structure of neutron production during MLI experiments.

Main Methods:

  • Fielding a one-dimensional imager of neutrons (1D-ION) diagnostic.
  • Utilizing a CR-39 solid-state nuclear track detector to record neutron images.
  • Applying a modified generalized expectation-maximization algorithm for profile reconstruction.

Main Results:

  • Successfully reconstructed an axial neutron emission profile of the stagnated fusion plasma.
  • Validated the reconstruction algorithm by comparing neutron emission profiles with x-ray emission profiles.
  • Demonstrated the capability of the 1D-ION diagnostic and reconstruction algorithm.

Conclusions:

  • The modified expectation-maximization algorithm provides a viable method for reconstructing axial neutron emission profiles.
  • This technique enhances the study of spatial neutron production in fusion plasmas.
  • The results contribute to the advancement of diagnostics for fusion energy research.