Two-color spatial and temporal temperature measurements using a streaked soft x-ray imager

Area of Science:

• High energy-density physics
• Plasma diagnostics
• Soft x-ray imaging

Background:

• Accurate temperature measurement is crucial for understanding high energy-density physics experiments.
• Existing soft x-ray imaging techniques face challenges in spectral sensitivity and accuracy.

Purpose of the Study:

• To design and implement a dual-channel streaked soft x-ray imager for precise temperature measurements.
• To reduce uncertainties in x-ray color-temperature diagnostics.

Main Methods:

• Utilized a dual-channel imager with two slit apertures and a nickel mirror for simultaneous imaging.
• Employed thin filters for narrow bandpass imaging at 510 eV and 360 eV.
• Implemented a 100 nm CsI on 50 nm Al photocathode to minimize spectral features.

Main Results:

• The imager successfully created two distinct images of the x-ray source.
• The brightness ratio of the two images allowed for color-temperature determination.
• Achieved an accuracy of approximately 4.5% at 100 eV for temperature measurements, assuming a well-known spectral shape.

Conclusions:

• The developed dual-channel streaked soft x-ray imager is a valuable tool for high energy-density physics.
• The instrument provides accurate x-ray color-temperature measurements with reduced spectral uncertainties.
• Further refinements in spectral sensitivity knowledge can enhance measurement accuracy.