Development of multichannel low-energy neutron spectrometer

Area of Science:

• Nuclear Physics
• Plasma Physics
• Fusion Energy

Background:

• Inertial confinement fusion (ICF) experiments require precise diagnostics for neutron emissions.
• Down-scattered neutrons (DSN) provide crucial data on plasma conditions and reaction pathways.
• Existing DSN measurement techniques may lack the necessary resolution or compactness.

Purpose of the Study:

• To develop and validate a compact, multichannel low-energy neutron spectrometer for DSN measurements in ICF.
• To assess the performance of a lithium-glass-scintillator-based detector in a real ICF environment.
• To establish reliable time calibration and characterize the detector's response.

Main Methods:

• Development of a 256-channel lithium-glass-scintillator-based neutron spectrometer.
• Implementation and testing of the spectrometer in ICF experiments using the GEKKO XII laser.
• Time calibration of the analog-to-digital converter system using X-ray pulse signals.
• Analysis of the detector's impulse response and observation of fusion neutron signals.

Main Results:

• Successful implementation and testing of the compact 256-channel spectrometer in GEKKO XII ICF experiments.
• Accurate time calibration of the data acquisition system achieved using X-ray pulses.
• Clear observation of the DD-primary fusion neutron signal.
• Successful characterization of the detector's impulse response.

Conclusions:

• The developed multichannel neutron spectrometer is effective for DSN measurements in ICF.
• The compact design and validated performance make it suitable for current and future ICF research.
• This instrument will enhance the diagnostic capabilities for studying fusion reactions.