| Autor: |
C. Stoeckl, D. Cao, L. Ceurvorst, A. Kalb, J. Kwiatkowski, A. Shvydky, W. Theobald |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
The Review of scientific instruments. 93(10) |
| ISSN: |
1089-7623 |
| Popis: |
On the OMEGA laser system, the beam-pointing accuracy is verified by irradiating a 4 mm diameter Au-coated spherical target with ∼23 kJ of laser energy. Up to ten x-ray pinhole cameras record the x-ray emission from all 60-beam spots. A new set of algorithms has been developed to improve the accuracy of the pointing evaluation. An updated edge-finding procedure allows one to infer the center of the sphere with subpixel accuracy. A new approach was introduced to back-propagate the pixel locations on the 2D image to the 3D surface of the sphere. A fast Fourier transform-based de-noising method significantly improves the signal-to-noise of the data. Based on the beam-pointing analysis, hard-sphere calculations of the laser-drive illumination uniformity on the target surface and the decomposition of the illumination distribution into lower order modes (1–10) are evaluated. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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