本文選題：強激光脈沖 + 離子體通道　； 參考：《南昌大學》2015年碩士論文

【摘要】：近幾十年,激光技術不斷完善,特別是超強超短激光脈沖的出現(xiàn),促進了激光等離子體相互作用的快速發(fā)展。首先,激光在等離子體中的穩(wěn)定傳播在實際應用中有重要意義,如激光等離子體加速器,激光核聚變以及高次諧波的產生等,因此激光在等離子體中傳播的研究一直是熱點。另外,因為高能電子束在慣性約束核聚變中的快點火、高能粒子加速器、X射線的產生等方面有著重要的應用,因此高品質電子束的獲取也是激光等離子體研究的熱點之一。本學位論文主要探究了激光與等離子體相互作用中兩個方面的內容。1、考慮在等離子體尾波場及高階相對論非線性效應作用下,強激光脈沖在拋物型預等離子體通道中的傳播特性。用變分法獲得激光的演化方程,數(shù)值分析高階相對論非線性、橫向尾波場和縱向尾波場效應對激光脈沖傳播的影響規(guī)律。2、采用粒子模擬方法,探究在高密度等離子體通道壁中強激光脈沖驅動空泡尾場演化及其電子加速。研究了激光尾波場加速機制轉變?yōu)榈入x子體尾波場加速機制的物理過程。研究表明:由于尾波場縱向收縮,激光尾波場加速階段自注入電子束在尾波場中實現(xiàn)穩(wěn)相加速;隨著激光脈沖的耗散,自注入電子束驅動等離子體尾場進一步捕獲并加速通道中的電子,最終獲得兩群高品質電子束。
[Abstract]:In recent decades, laser technology has been continuously improved, especially the appearance of ultrashort laser pulses, which promotes the rapid development of laser plasma interaction. First of all, the steady propagation of laser in plasma has important significance in practical applications, such as laser plasma accelerator, laser fusion and high harmonic generation, so the research of laser propagation in plasma has been a hot topic. In addition, high energy electron beam has important applications in inertial confinement fusion and X-ray generation of high energy particle accelerator, so the acquisition of high quality electron beam is also one of the hot spots in laser plasma research. In this dissertation, the contents of two aspects of laser plasma interaction are discussed. 1. Under the influence of plasma coda field and high order relativistic nonlinear effect, Propagation characteristics of intense laser pulses in parabolic preplasma channels. The evolution equation of laser is obtained by variational method. The effects of high order relativistic nonlinearity, transverse coda field and longitudinal coda field effect on laser pulse propagation are numerically analyzed. The evolution and electron acceleration of cavitation tail field driven by intense laser pulses in the wall of high density plasma channel are investigated. The physical process of laser coda field acceleration mechanism is studied. The results show that the self-injected electron beam accelerates in the wake field at the acceleration stage due to the longitudinal contraction of the wake field, and with the dissipation of the laser pulse, The self-injected electron beam drives the plasma tail field to further capture and accelerate the electrons in the channel, and finally two groups of high quality electron beams are obtained.
【學位授予單位】：南昌大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：O53;TN249

【參考文獻】

相關期刊論文 前1條

1 徐涵,常文蔚,卓紅斌,曹莉華,岳宗五;2(1/2)維等離子體粒子模擬分布式并行程序設計[J];計算物理;2002年04期

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本文編號：2057514