Variable-sagittal-radii elliptical x-ray crystal spectrometers for high-neutron-yield plasma diagnostics

Area of Science:

• Plasma Physics
• X-ray Spectroscopy
• Nuclear Fusion Diagnostics

Background:

• Experiments with high neutron yields require robust plasma diagnostic tools.
• Traditional x-ray crystal spectrometers face challenges with background noise and spectral resolution in such environments.

Purpose of the Study:

• To propose novel sagittally focusing x-ray crystal spectrometers with elliptical profiles for plasma diagnostics.
• To optimize spectrometer geometry for enhanced spectral resolution and reduced neutron-induced background.
• To present two distinct designs tailored for different spectroscopic applications.

Main Methods:

• Development of spectrometers with variable sagittal radius of curvature for precise focusing.
• Strategic placement of detectors to maximize source-to-detector distance and minimize background.
• Ray tracing simulations to verify spectrometer performance characteristics.

Main Results:

• Two spectrometer designs were proposed: one for x-ray continuum spectroscopy (high magnification) and another for time-resolved spectroscopy of characteristic lines (high demagnification).
• Elliptical geometry necessitates demagnifying designs to avoid source size impact on spectral resolution.
• Ray tracing confirmed the key performance characteristics of both proposed designs.

Conclusions:

• Sagittally focusing elliptical spectrometers offer a viable solution for plasma diagnostics in high neutron yield environments.
• The proposed designs provide flexibility for different spectroscopic needs, from continuum to time-resolved line spectroscopy.
• These advancements enhance the capability to analyze plasma behavior in extreme experimental conditions.