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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
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Related Experiment Video

Updated: Jun 14, 2025

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Optically multiplexed neutron time-of-flight technique for inertial confinement fusion.

L Tafoya1,2, C Wilde2, B Cata2

  • 1University of Michigan, Ann Arbor, Michigan 48109, USA.

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|September 6, 2024
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Summary

Neutron time-of-flight (nTOF) detectors for fusion energy research were modified using optical fibers and photomultiplier tubes. This technique time-multiplexed signals, enabling validation of 2D spatially resolved instruments for improved diagnostics.

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Area of Science:

  • Nuclear Fusion Diagnostics
  • Plasma Physics
  • Instrumentation Engineering

Background:

  • Neutron time-of-flight (nTOF) detectors are vital for diagnosing inertial confinement fusion (ICF) experiments.
  • Current nTOF detectors provide essential data on hotspot ion temperature and fuel areal density.
  • Previous research introduced 1D spatial resolution to nTOF detectors.

Purpose of the Study:

  • To validate a 2D spatially resolved instrument design by modifying a 1D nTOF detector.
  • To explore the use of a fast photomultiplier tube (PMT) and time-multiplexing via optical fibers.
  • To assess the feasibility of reconstructing 2D profiles from 1D measurements.

Main Methods:

  • Modification of a 1D nTOF detector using a fast photomultiplier tube (PMT).
  • Employing optical fibers of varying lengths to time-multiplex signals from an imaging array of scintillators.
  • Conducting ride-along experiments on the OMEGA laser facility with 20 fiber-coupled scintillator channels.

Main Results:

  • Demonstrated time-multiplexing of nTOF signals using fiber optics.
  • Provided constraints on fiber lengths and PMT gating for optimal pulse fidelity.
  • Preliminary estimation of the instrument response function (IRF) through calibration.

Conclusions:

  • nTOF signals can be effectively time-multiplexed using optical fibers.
  • Strategic design is crucial to mitigate signal-to-noise reduction and other signal degradation issues.
  • This technique has significant implications for advanced ICF diagnostics, including 2D ion temperature imaging.