Chinese Optics Letters, 2020, 18 (11): 113401, Published Online: Sep. 29, 2020
High efficiency X-ray diffraction diagnostic spectrometer with multi-curvature bent crystal Download: 646次
inertial confinement fusion X-ray crystal spectrometer multi-curvature bent crystal X-ray diffraction
Abstract
In spectral diagnostic physics experiments of inertial confinement fusion, the spectral signal is weak due to the low diffraction efficiency when using bent crystals. A spectral diagnostic instrument with high efficiency and wide spectral range is urgently needed. A multi-curvature bent crystal with multi-energy focusing ability is proposed based on the traditional conical crystal geometry. It has advantages of wide spectral range, strong focusing ability, and high spectral resolution. It also can eliminate the imaging aberration in principle due to rotational symmetry for the incoming X rays. A spectral diagnostic experiment based on a fabricated multi-curvature α-quartz crystal was accomplished using a titanium X-ray tube of the bent crystal, and the corresponding experimental data using a plane α-quartz crystal was also acquired to demonstrate the strong focusing ability. The result shows that the Kα intensity of the multi-curvature α-quartz crystal is 157 times greater than that of the plane crystal, and the corresponding energy range is about 4.51–5.14 keV. This diagnostic instrument could be combined with a streak camera at a vertical direction so as to intensify the diffracted X-ray signal with a wide spectral range.
Jun Shi, Tong Yao, Miao Li, Guohong Yang, Minxi Wei, Wanli Shang, Feng Wang. High efficiency X-ray diffraction diagnostic spectrometer with multi-curvature bent crystal[J]. Chinese Optics Letters, 2020, 18(11): 113401.