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Relativistic Laser Self-Channeling in Underdense Plasmas: A Simulation of Key Experimental Parameters.

機(jī)譯：相對論激光在弱密度等離子體中的自溝道效應(yīng)：關(guān)鍵實(shí)驗(yàn)參數(shù)的模擬。

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摘要

Relativistic and ponderomotive self-channeling of intense ultrashort laser pulses in underdense plasmas has been studied under more realistic experimental conditions in this thesis in order to optimize the controlled power compression and stability of the channel -- elements that are critical to the applications associated with these channels, including the generation of coherent x-rays. In experiments for coherent x-ray generation, the electron plasma column is created by the front temporal region of the laser pulse through ionization. A number of inter-connected experimental parameters will determine the quality of the transition from the incident laser spatial profile to that of a channel eigenmode. Proper control of these parameters enables the incident transverse laser radiation profile be matched adiabatically with minimal coupling losses to the spatial character of the desired fundamental channel eigenmode which provides a stable and robust zone for power compression. In order to study the effect of these experimental parameters on the formation and stability of laser self-channeling in underdense plasmas, the relativistic model under simplified conditions is modified with the inclusion of gas jet density and ionization conditions, laser mode structure and focusing conditions, and laser wavelength. The model results are in good general agreement with the experimental observations for the self-channeling of TW-level 248 nm laser pulses in Xenon and Krypton gas jets employed for the generation of coherent amplified keV x-ray pulses and capture the salient features of the relativistic self-channeling dynamics. The results outline the laser-target conditions that must be met to initiate the efficient self-channeling of laser. As the generation of a straight channel is required for x-ray amplification, the results in this thesis underline the importance of a high laser beam quality. The simulations also show that the combination of laser wavelength and target gas species is important, and the combination of 248nm laser radiation and a Xe gas target is one of the best choices for relativistic self-channeling. The relativistic laser self-channeling simulations presented in this thesis have examined the root causes of experimental observations more accurately than before and have computed results over a wider range of conditions than have been performed in experiments.
機(jī)譯：為了優(yōu)化通道的受控功率壓縮和穩(wěn)定性，本論文在更現(xiàn)實(shí)的實(shí)驗(yàn)條件下研究了低密度等離子體中強(qiáng)超短激光脈沖的相對論和質(zhì)動力自通道，以優(yōu)化通道的受控功率壓縮和穩(wěn)定性，這是與這些應(yīng)用相關(guān)的關(guān)鍵因素通道，包括相干X射線的產(chǎn)生。在產(chǎn)生相干X射線的實(shí)驗(yàn)中，電子等離子體柱是由激光脈沖通過電離的前臨時區(qū)域產(chǎn)生的。許多相互關(guān)聯(lián)的實(shí)驗(yàn)參數(shù)將確定從入射激光空間輪廓到通道本征模的過渡質(zhì)量。對這些參數(shù)的適當(dāng)控制使得能夠以最小的耦合損耗絕熱地匹配入射的橫向激光輻射輪廓，從而與所需的基本通道本征模的空間特征相匹配，從而為功率壓縮提供了一個穩(wěn)定而堅固的區(qū)域。為了研究這些實(shí)驗(yàn)參數(shù)對低密度等離子體中激光自溝道形成和穩(wěn)定性的影響，對簡化條件下的相對論模型進(jìn)行了修改，包括氣體噴射密度和電離條件，激光模式結(jié)構(gòu)和聚焦條件，和激光波長。模型結(jié)果與氙氣和K氣噴嘴中TW級248 nm激光脈沖的自通道化（用于產(chǎn)生相干的keV x射線脈沖并捕獲其顯著特征的實(shí)驗(yàn)觀察）基本吻合。相對論的自我引導(dǎo)動力學(xué)。結(jié)果概述了啟動有效的激光自通道化必須滿足的激光目標(biāo)條件。由于X射線放大需要產(chǎn)生直通道，因此本論文的結(jié)果強(qiáng)調(diào)了高激光束質(zhì)量的重要性。仿真還表明，激光波長和目標(biāo)氣體種類的組合很重要，而248nm激光輻射和Xe氣體目標(biāo)的組合是相對論自溝道的最佳選擇之一。本文提出的相對論激光自竄動仿真比以前更準(zhǔn)確地檢查了實(shí)驗(yàn)觀察的根本原因，并在比實(shí)驗(yàn)更廣泛的條件下計算了結(jié)果。

著錄項

  • 作者

    Zhao, Ji.;

  • 作者單位

    University of Illinois at Chicago.;

  • 授予單位 University of Illinois at Chicago.;
  • 學(xué)科 Physics.
  • 學(xué)位 Ph.D.
  • 年度 2015
  • 頁碼 260 p.
  • 總頁數(shù) 260
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 遙感技術(shù);
  • 關(guān)鍵詞

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