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Enhanced NIF neutron activation diagnostics.

C B Yeamans1, D L Bleuel, L A Bernstein

  • 1Lawrence Livermore National Laboratory, Livermore, California 94550, USA. yeamans1@llnl.gov

The Review of Scientific Instruments
|November 7, 2012
PubMed
Summary
This summary is machine-generated.

This study proposes new neutron diagnostics using permanently installed samples to overcome limitations of current removable samples. These systems enhance neutron diagnostic capabilities, improving signal-to-noise ratio and enabling fusion core velocity measurements.

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Area of Science:

  • Nuclear Fusion Diagnostics
  • Plasma Physics
  • Neutron Activation Analysis

Background:

  • Current NIF neutron activation diagnostics use removable samples, causing inefficiencies.
  • A lower limit on observable product half-life exists with current methods.

Purpose of the Study:

  • To propose and analyze novel neutron diagnostic systems with permanently installed samples.
  • To overcome operational inefficiencies and expand diagnostic capabilities.

Main Methods:

  • Investigated two systems: one using the (89)Zr/(89 m)Zr isomer ratio in Zr, and another using potassium zirconate.
  • Evaluated physics and engineering aspects of proposed systems.

Main Results:

  • Both proposed systems can improve signal-to-noise ratio by at least a factor of 5.
  • Systems allow independent measurement of fusion core velocity and fuel areal density.

Conclusions:

  • Permanently installed neutron activation samples offer significant advantages over removable ones.
  • Proposed systems enhance diagnostic precision and expand measurement possibilities for fusion research.