Superresolution of a compact neutron spectrometer at energies relevant for fusion diagnostics

The ability to achieve resolution that is better than the instrument resolution (i.e., superresolution) is well known in optics, where it has been extensively studied. Unfortunately, there are only a handful of theoretical studies concerning superresolution of particle spectrometers, even though exp...

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Bibliographic Details
Main Authors: Reginatto, M., Zimbal, A.
Format: Conference Proceeding
Language:English
Subjects:
BARYONS
COMPUTERIZED SIMULATION
DATA ANALYSIS
ELEMENTARY PARTICLES
ENERGY SPECTRA
ENTROPY
FERMIONS
FLUIDS
FUNCTIONS
HADRONS
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
LIQUIDS
MEASURING INSTRUMENTS
NEUTRON SPECTROMETERS
NEUTRON SPECTROSCOPY
NEUTRONS
NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEONS
PEAKS
PHOSPHORS
PHYSICAL PROPERTIES
PLASMA
RESOLUTION
RESPONSE FUNCTIONS
SIMULATION
SPECTRA
SPECTROMETERS
SPECTROSCOPY
THERMODYNAMIC PROPERTIES
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Summary:The ability to achieve resolution that is better than the instrument resolution (i.e., superresolution) is well known in optics, where it has been extensively studied. Unfortunately, there are only a handful of theoretical studies concerning superresolution of particle spectrometers, even though experimentalists are familiar with the enhancement of resolution that is achievable when appropriate methods of data analysis are used, such as maximum entropy and Bayesian methods. Knowledge of the superresolution factor is in many cases important. For example, in applications of neutron spectrometry to fusion diagnostics, the temperature of a burning plasma is an important physical parameter which may be inferred from the width of the peak of the neutron energy spectrum, and the ability to determine this width depends on the superresolution factor. Kosarev has derived an absolute limit for resolution enhancement using arguments based on a well known theorem of Shannon. Most calculations of superresolution factors in the literature, however, are based on the assumption of Gaussian, translationally invariant response functions and therefore not directly applicable to neutron spectrometers which typically have response functions not satisfying these requirements. In this work, we develop a procedure that allows us to overcome these difficulties and we derive estimates of superresolution for liquid scintillator spectrometers of a type commonly used for neutron measurements. Theoretical superresolution factors are compared to experimental results.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.3573621