Design and calibration of hot-electron spectrometer array for angle-resolved measurement

Area of Science:

• Plasma Physics
• Laser-Plasma Interactions
• Spectroscopy

Background:

• High-power laser-plasma interactions generate hot electrons, which are critical for understanding energy transfer and particle acceleration.
• Measuring spatially resolved electron spectra is essential for characterizing these phenomena.
• Existing methods may lack the required angular coverage or energy resolution.

Purpose of the Study:

• To design and implement a novel hot-electron spectrometer array for high-power laser-plasma experiments.
• To achieve wide-angle coverage and high-energy resolution for detailed spectral analysis.
• To measure spatially resolved electron energy spectra in laser-irradiated targets.

Main Methods:

• A spectrometer array comprising 19 identical electron spectrometers was designed.
• Spectrometers utilize a uniform magnetic field for electron detection (20–500 keV).
• The array offers a wide-angle range with spectrometers positioned in three directions at 10° intervals.

Main Results:

• The spectrometer array was successfully calibrated using an electron accelerator.
• Spatially resolved electron energy spectra were obtained from an aluminum foil target.
• The measured spectra approximated a Maxwell distribution, consistent with theoretical models.

Conclusions:

• The developed hot-electron spectrometer array is effective for measuring spatially resolved electron spectra in laser-plasma experiments.
• The system's design provides crucial data for understanding hot-electron generation and transport.
• This technology advances the study of high-energy-density physics driven by lasers.