本文選題：激光 + 近臨界��； 參考：《強(qiáng)激光與粒子束》2017年08期

【摘要】：基于激光驅(qū)動(dòng)超熱電子產(chǎn)生的高品質(zhì)X射線源是高能量密度實(shí)驗(yàn)中有效的診斷技術(shù)手段,對(duì)輻射源亮度、穿透性和時(shí)空分辨率等特性具有極高的要求。結(jié)合粒子模擬和蒙特卡羅模擬研究,首先利用近臨界密度等離子體實(shí)現(xiàn)了激光自聚焦通道中的大電量高能電子加速,通過(guò)直接加速機(jī)制產(chǎn)生了電量超過(guò)600nC、有效溫度可達(dá)15 MeV的高能電子;以此為基礎(chǔ)提高電子-光子能量轉(zhuǎn)換率,有效優(yōu)化了光子能量和產(chǎn)額,并通過(guò)一定的轉(zhuǎn)換靶參數(shù)優(yōu)化方案產(chǎn)生了微焦點(diǎn)(FWHM小于200μm)、高能、高亮度X射線,為高空間分辨(小于200μm)成像診斷提供了很好的途徑,有望早日實(shí)現(xiàn)激光等離子體軔致輻射單脈沖瞬態(tài)照相的實(shí)際應(yīng)用。
[Abstract]:The high quality X-ray source based on laser driven super hot electron is an effective diagnostic technique in high energy density experiment. It has very high requirements for the luminance, penetration and space-time resolution of the radiation source. In combination with particle simulation and Monte Carlo simulation, the high energy electron acceleration in the laser autofocus channel is first achieved by using a near critical density plasma. Through the direct acceleration mechanism, high energy electrons with electric quantity exceeding 600nC and effective temperature up to 15 MeV are produced, which can be used as a basis to improve the electron-photon energy conversion rate and effectively optimize the photon energy and yield. The FWHM of FWHM is less than 200 渭 m, and the high energy and brightness X-ray is produced by a certain conversion target parameter optimization scheme, which provides a good way for the imaging diagnosis of high spatial resolution (less than 200 渭 m). It is expected that the practical application of Bremsstrahlung monopulse transient photography of laser plasma will be realized at an early date.
【作者單位】： 中國(guó)工程物理研究院激光聚變研究中心等離子體物理重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(11375161,11505166) 等離子體物理重點(diǎn)實(shí)驗(yàn)室基金項(xiàng)目(9140C680301150C68297)
【分類號(hào)】：O434.1;O53
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本文編號(hào)：2036815