Development of the hot spot diagnostics through the high spatial-temporal resolved and the energy resolved X-ray microscopy
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更新:2024-04-23 01:05:47 浏览:100次
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摘要
A high-quality hot spot is crucial in the laser driven inertial confinement fusion (ICF). The implosion asymmetry and the hot-spot mix are still the two challenges to the ignition and high gain fusion energy releasing. To the implosions driven by 100kJ laser energy, the X-ray microscopy is one of the optimal diagnostics. Considering the diameter of the hot spot is about 50μm, the Kirkpatrick-Baez (KB) microscope is utilized as a routine diagnostic instrument on the laser facilities. It has a higher spatial resolution and a higher light collection efficiency than that in the pinhole imaging. However, the KB microscope has the instinctive uniformities on the reflectivity and the spatial resolution. A spatial flat response KB microscope was developed for the low modes asymmetry diagnostics, like P2 and P4. And the intensity in the KB imaging map was corrected by location measurement of the hot spot. To the high-modes asymmetries diagnostics, the spatial resolution is required to be less than 3μm and the temporal resolution less than 10ps. It is out of the capability of the KB microscope with an X-ray framing camera (XFC). A pulse dilated Wolter-like X-ray microscope was proposed and developed. It consisted of a Wolter-like microscope and a pulse dilated XFC. The microscope has the Wolter-I type mirror configurations in the sagittal and meridian directions, respectively. The spatial resolution was about 3μm in a field-of-view of 400μm, and the temporal resolution was about 10ps. To the electron temperature profile diagnostics, which is related with the mix, an energy resolved KB microscope was developed. It consisted of four imaging channels, response to the 4.5keV, 6.4keV, 8.2keV and 9.6keV, respectively. With the measured hot spot emission profiles in 4 energies, the electron temperature was extracted. It is used to analyze the width of the mix zone, the chunk mix size and the amount of the mix elements.
关键词
hot spot diagnostics,implosion asymmetry,hot-spot mix,KB microscope
稿件作者
Xing Zhang
Laser Fusion Research Center; China Academy of Engineering Physics
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