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Compact high energy x-ray spectrometer based on forward Compton scattering for high intensity laser plasma
S Singh1, R Versaci1, A Laso Garcia2
1ELI Beamlines, Institute of Physics of the ASCR, Dolni Brezany, Czech Republic.
The Review of Scientific Instruments
|September 7, 2018
Summary
This study details a new high-energy X-ray spectrometer. Calibration confirms its effectiveness for photon energies up to 18 MeV, showing increased flux and temperature with higher energies.
Area of Science:
- Nuclear Physics and Instrumentation
- High-Energy Photon Spectrometry
- Compton Scattering Applications
Background:
- Accurate measurement of high-energy X-ray photons is crucial for various scientific applications.
- Forward Compton scattering offers a promising method for developing such spectrometers.
- Previous spectrometers faced limitations in energy range, resolution, or dynamic range.
Purpose of the Study:
- To describe the design of a novel forward Compton scattering high-energy X-ray spectrometer.
- To present calibration results and performance evaluation of the spectrometer.
- To investigate the impact of operating environment (vacuum vs. air) on spectral measurements.
Main Methods:
- Calibration using a bremsstrahlung source at the Helmholtz-Zentrum Dresden-Rossendorf Electron linac.
- Testing at various bremsstrahlung end-point energies (10.5, 13, 15, 18 MeV).
- Comparison of experimental data with Monte Carlo simulations.
Main Results:
- The spectrometer demonstrated effectiveness for photon energies from 4-20 MeV with energy resolution.
- Systematic increases in maximum energy, photon temperature, and flux were observed with higher calibration energies.
- Operation in low vacuum (< 0.1 mbar) is essential to avoid spurious signals from Compton scattering in air.
- A dynamic range greater than 30 was achieved through careful design and shielding.
Conclusions:
- The developed forward Compton scattering spectrometer is a reliable tool for high-energy X-ray measurements.
- Understanding and mitigating environmental effects like air scattering is critical for accurate spectral analysis.
- The spectrometer's performance, validated by Monte Carlo simulations, meets demanding experimental requirements.
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