原子与分子物理学报
原子與分子物理學報
원자여분자물이학보
CHINESE JOURNAL OF ATOMIC AND MOLECULAR PHYSICS
2014年
5期
759-763
,共5页
三维时变等离子体%耦合%电流密度%拉普拉斯变换%时域有限差分法%Compton散射
三維時變等離子體%耦閤%電流密度%拉普拉斯變換%時域有限差分法%Compton散射
삼유시변등리자체%우합%전류밀도%랍보랍사변환%시역유한차분법%Compton산사
3D time-varying plasma%Coupling%Electric current density%Laplace transform%FDTD%Com-pton scattering
应用多光子非线性Compton散射模型和电流密度拉普拉斯变换改进的时域有限差分法，研究了超强激光照射三维时变等离子体的散射特性，提出了Compton散射光是影响等离子体散射的新机制，给出了该等离子体散射截面和频率随时间变化的修正方程，并进行了数值仿真。结果表明：与Compton散射前相比，Compton散射使等离子体散射截面增大，且随频率增大迅速衰减。这是因散射使等离子体中电子从耦合激光场中获得更多能量，从而导致电子被耦合场俘获的缘故；使瞬变等离子体最大频率随时间呈准直线缓慢下降趋势。这是因散射使等离子体中电子辐射阻尼效应增强，从而导致电子能量衰减、频率下降的缘故；使缓变等离子体频率随时间缓慢增大。这是因散射使等离子体中电子辐射阻尼增大效应减弱了频率增大的缘故。
應用多光子非線性Compton散射模型和電流密度拉普拉斯變換改進的時域有限差分法，研究瞭超彊激光照射三維時變等離子體的散射特性，提齣瞭Compton散射光是影響等離子體散射的新機製，給齣瞭該等離子體散射截麵和頻率隨時間變化的脩正方程，併進行瞭數值倣真。結果錶明：與Compton散射前相比，Compton散射使等離子體散射截麵增大，且隨頻率增大迅速衰減。這是因散射使等離子體中電子從耦閤激光場中穫得更多能量，從而導緻電子被耦閤場俘穫的緣故；使瞬變等離子體最大頻率隨時間呈準直線緩慢下降趨勢。這是因散射使等離子體中電子輻射阻尼效應增彊，從而導緻電子能量衰減、頻率下降的緣故；使緩變等離子體頻率隨時間緩慢增大。這是因散射使等離子體中電子輻射阻尼增大效應減弱瞭頻率增大的緣故。
응용다광자비선성Compton산사모형화전류밀도랍보랍사변환개진적시역유한차분법，연구료초강격광조사삼유시변등리자체적산사특성，제출료Compton산사광시영향등리자체산사적신궤제，급출료해등리자체산사절면화빈솔수시간변화적수정방정，병진행료수치방진。결과표명：여Compton산사전상비，Compton산사사등리자체산사절면증대，차수빈솔증대신속쇠감。저시인산사사등리자체중전자종우합격광장중획득경다능량，종이도치전자피우합장부획적연고；사순변등리자체최대빈솔수시간정준직선완만하강추세。저시인산사사등리자체중전자복사조니효응증강，종이도치전자능량쇠감、빈솔하강적연고；사완변등리자체빈솔수시간완만증대。저시인산사사등리자체중전자복사조니증대효응감약료빈솔증대적연고。
By using the model of the multi -photon nonlinear Compton scattering and a modified means of Laplace transform finite-difference time-domain(LTJEC-FDTD) ,the influences of the characteristics of electromagnetic scattering on the 3D time-varying plasma under the extra-intensity laser illuminating are studied ,a new mechanism on plasma scattering of the influence produced by Compton scattering is given ,the amending equations on the scattering section of the plasma and frequency change with time have been given out ,and the equations are simulated with numbers .The results show that the scattering section of the plasma is increased by Compton scattering than that before Compton scattering ,and the increasing of the plasma frequency is quickly decreased .The cause is that the big energy from the cou-pling laser field is get by electron in the plasma under Compton scattering ,therefore the electron is cap-tured by the coupling laser field ;The maximum frequency of the instantaneous change plasma is slowly decreased with quasi -rectilinear form by Compton scattering ,and the cause is that the radiation damp-ing effects of the electron in the plasma are increased by Compton scattering ,therefore the energy and frequency of the electron are decreased ;The frequency of the slow changing plasma is slowly increased with time change by Compton scattering ,and the cause is that the frequency increasing effect is de-creased by the increasing effect of the radiation damping of the electron in the plasma .
