期刊
NUCLEAR SCIENCE AND TECHNIQUES
卷 34, 期 11, 页码 -出版社
SPRINGER SINGAPORE PTE LTD
DOI: 10.1007/s41365-023-01302-3
关键词
X-ray multilayer mirror; Aperiodic multilayer; Flat response; Sputtering deposition; Synchrotron radiation
In this study, aperiodic Mo/B4C multilayer mirrors were optimized for X-ray plasma diagnostics, achieving a narrow bandwidth and consistent spectral response. The short-term thermal stability of the multilayer was evaluated through temperature-dependent reflectivity measurements.
Multilayer interference mirrors play a pivotal role in spectroscopic diagnostic systems, which probe electron temperature and density during inertial confinement fusion processes. In this study, aperiodic Mo/B4C multilayer mirrors of varied thicknesses were investigated for X-ray plasma diagnostics at the 9.67-keV W-L beta line. The thickness distribution of the aperiodic multilayers was designed using the first Bragg diffraction condition and then optimized through a simplex algorithm to realize a narrow bandwidth and consistent spectral response. To enhance spectral accuracy, further refinements were undertaken by matching the grazing incidence X-ray reflectivity data with actual structural parameters. X-ray reflectivity measurements from the SSRF synchrotron radiation facility on the optimized sample showed a reflectivity of 29.7 +/- 2.6%, flat-band range of 1.3 keV, and bandwidth of 1.7 keV, making it suitable for high-temperature plasma diagnostics. The study explored the potential of predicting the 9.67 keV reflectivity spectrum using the fitting data from the grazing incidence X-ray reflectivity curves at 8.05 keV. Additionally, the short-term thermal stability of an aperiodic multilayer was assessed using temperature-dependent in situ X-ray measurements. Shifts in the reflectivity spectrum during annealing were attributed to interdiffusion and interfacial relaxation. The research team recommends the aperiodic Mo/B4C multilayer mirror for operations below 300 celcius.
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