Chinese Optics Letters, Vol. 18, Issue 11, 113401 (2020)
High efficiency X-ray diffraction diagnostic spectrometer with multi-curvature bent crystal
Jun Shi1, Tong Yao2, Miao Li2,*, Guohong Yang3, Minxi Wei3, Wanli Shang3, and Feng Wang3
- 1Key Laboratory of Optoelectronic Technology and Systems of the Ministry of Education, Chongqing University, Chongqing 400044, China
- 2College of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
- 3Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
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.
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