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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Charged-particle spectroscopy for diagnosing shock ρR and strength in NIF implosions.

A B Zylstra1, J A Frenje, F H Séguin

  • 1Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, 02139, USA. zylstra@mit.edu

The Review of Scientific Instruments
|November 7, 2012
PubMed
Summary

The Wedge Range Filter (WRF) proton spectrometer successfully measured proton spectra from D-(3)He reactions at the National Ignition Facility (NIF). This diagnostic provides crucial data on plasma density-radius (ρR) and shock strength in fusion experiments.

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Area of Science:

  • Nuclear Fusion Science
  • Plasma Physics
  • High-Energy-Density Physics

Background:

  • The Wedge Range Filter (WRF) proton spectrometer, initially developed for OMEGA, was adapted for the National Ignition Facility (NIF).
  • Accurate measurement of proton spectra is essential for understanding fusion yields and plasma conditions.

Purpose of the Study:

  • To report the first proton spectroscopy measurement at NIF using WRFs.
  • To demonstrate the WRF's capability in characterizing D-(3)He implosions.
  • To correlate proton energy downshift with plasma properties and shock strength.

Main Methods:

  • Utilized the compact Wedge Range Filter (WRF) proton spectrometer.
  • Performed measurements on D-(3)He gas-containing tuning-campaign implosions at NIF.
  • Analyzed the energy spectrum of protons from D-(3)He reactions.

Main Results:

  • Successfully conducted the first proton spectroscopy measurement at NIF using WRFs.
  • Observed the energy downshift of 14.7-MeV protons, directly relating to total areal density (ρR) via plasma stopping power.
  • Measured the shock proton yield as an indicator of final merged shock strength.

Conclusions:

  • The WRF is a validated diagnostic for NIF, capable of providing critical data on fusion implosions.
  • Proton spectroscopy offers a direct method to infer plasma density-radius and shock dynamics.
  • This work establishes a foundation for advanced fusion diagnostics at NIF.