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Updated: Jul 4, 2026

Tree Core Analysis with X-ray Computed Tomography
Published on: September 22, 2023
Unfolding core asymmetries with x-ray emission images in symmetry diagnostic experiments
T X Huang1, Y K Ding, Z J Zheng
1National Key Laboratory of Laser Fusion, Research Center of Laser Fusion, CAEP, PO Box 919-986, Mianyang 621900, People's Republic of China.
Abstract:
A novel inversion technique is proposed to unfold core asymmetries at the source with x-ray emission images, which were obtained from imploded surrogate capsules in symmetry diagnostic experiments. The axisymmetrical core emission can be expanded as a Fourier series, with Legendre polynomials and spherical Bessel functions as bases concerned with polar angle and radius, respectively. A least-squares estimator is employed to obtain the unknown coefficients from its two-dimensional image data. The unfolded Legendre coefficients can be further used to test modeling of drive asymmetries in hohlraums. This technique is also demonstrated with a proof-of-principle experiment performed on the Shenguang II laser facility [L. Zunqi et al., Chin. J. Lasers B10, 6 (2001)].
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