Compact in-vacuum gamma-ray spectrometer for high-repetition rate PW-class laser-matter interaction

Area of Science:

• Nuclear Instrumentation
• Plasma Physics Diagnostics
• High-Energy Laser Systems

Background:

• High repetition rate laser facilities necessitate advanced diagnostic tools.
• Existing spectrometers face challenges in extreme conditions of PW-class laser-plasma interactions.
• Need for compact, robust, and sensitive gamma-ray detection.

Purpose of the Study:

• To design and present an active gamma-ray spectrometer for high repetition rate laser experiments.
• To ensure functionality within the extreme environment of a PW-class laser-plasma interaction chamber.
• To meet requirements for compactness, electromagnetic pulse resistance, and ISO-5 cleanliness.

Main Methods:

• Utilized stacked scintillators for broad gamma-ray energy range detection.
• Engineered for electromagnetic pulse (EMP) resistance and ISO-5 cleanroom compatibility.
• Calibrated using a 60Co radioactive source and employed stochastic minimization for unfolding.

Main Results:

• Demonstrated adaptability for various experimental setups through stacked scintillator design.
• Achieved high sensitivity and maintained compactness.
• Successfully tested the spectrometer in real conditions within the BELLA center's PW-class interaction chamber.

Conclusions:

• The designed active gamma-ray spectrometer is suitable for high repetition rate laser experiments.
• The device performs effectively under the extreme conditions of PW-class laser-plasma interactions.
• The spectrometer meets critical engineering and operational requirements for advanced laser facilities.