本文選題：阻止本領(lǐng)　切入點(diǎn)：能量損失　出處：《大連海事大學(xué)》2017年碩士論文

【摘要】：帶電粒子與等離子體相互作用過程中的能量損失與不同科學(xué)領(lǐng)域的許多應(yīng)用有關(guān),例如重離子慣性約束聚變,磁約束聚變,重離子電子冷卻等。20世紀(jì)80年代,啁啾脈沖放大技術(shù)為激光技術(shù)的發(fā)展創(chuàng)造了良好的條件,引發(fā)了人們研究在激光場(chǎng)影響下帶電粒子與等離子體相互作用的能量損失問題。特別是,隨著加速器技術(shù)的發(fā)展,產(chǎn)生高速重離子已經(jīng)成為可能,同時(shí)受重離子慣性約束聚變技術(shù)的發(fā)展需要,促進(jìn)了人們開展激光場(chǎng)影響下離子能量損失問題的研究。本文在伏拉索夫-泊松方程理論模型的基礎(chǔ)上,采用分子動(dòng)力學(xué)模擬方法,利用線性介電響應(yīng)理論和Brandt-Kitagawa有效電荷理論,推導(dǎo)了原子離子在等離子體中的相互作用勢(shì)和阻止本領(lǐng)表達(dá)式,進(jìn)一步討論了激光參數(shù)對(duì)原子離子與等離子體相互作用過程中能量損失的影響。首先我們?cè)诮o定激光角度α= π/3、等離子體密度n_0=10~(16)cm~(-3)、電子溫度T_e=3eV的情況下,研究了硼原子離子在激光場(chǎng)影響下的能量損失情況。在研究過程中我們發(fā)現(xiàn)激光場(chǎng)強(qiáng)對(duì)硼原子離子的能量損失具有一定的影響,發(fā)現(xiàn)其阻止本領(lǐng)隨著速度的增加呈現(xiàn)先增加后減小的趨勢(shì),且隨著激光場(chǎng)強(qiáng)的增加硼原子離子的阻止本領(lǐng)不斷減小。另外,研究發(fā)現(xiàn)硼原子離子的阻止本領(lǐng)還受到激光頻率和激光角度的影響。氮原子離子模擬結(jié)果隨激光參數(shù)的變化規(guī)律方面與硼原子離子的模擬結(jié)果具有類似的結(jié)論,但由于它們核電荷數(shù)的不同,導(dǎo)致同一激光場(chǎng)強(qiáng)度下它們的阻止本領(lǐng)不同。為此又對(duì)氧原子離子進(jìn)行了模擬探究,結(jié)果發(fā)現(xiàn):在同一激光場(chǎng)強(qiáng)度(a_E=3λ_D)下,氧原子離子的阻止本領(lǐng)大于氮原子離子的阻止本領(lǐng),氮原子離子的阻止本領(lǐng)又大于硼原子離子的阻止本領(lǐng),即對(duì)于不同的原子類型,阻止本領(lǐng)隨核電荷數(shù)的增加而增大。通過以上對(duì)硼原子離子、氮原子離子、氧原子離子的模擬,結(jié)果表明:激光場(chǎng)強(qiáng)度是影響原子離子與等離子體之間相互作用的一個(gè)重要參數(shù)。隨著激光強(qiáng)度的增加,阻止本領(lǐng)不斷減小;原子離子的阻止本領(lǐng)隨著速度的增加呈現(xiàn)了先增大而后減小的趨勢(shì);另外,激光頻率、激光角度也能夠?qū)ψ柚贡绢I(lǐng)起到調(diào)制作用;隨著原子離子核電荷數(shù)的增加,原子離子的阻止本領(lǐng)會(huì)不斷增大。
[Abstract]:The energy loss in the interaction between charged particles and plasma is related to many applications in different scientific fields, such as heavy ion inertial confinement fusion, magnetic confinement fusion, heavy ion electron cooling and so on. Chirped pulse amplification has created favorable conditions for the development of laser technology, which has triggered the study of the energy loss of the interaction between charged particles and plasma under the influence of laser field, especially with the development of accelerator technology. It has become possible to produce high speed heavy ions, and the development of heavy ion inertial confinement fusion technology is needed. In this paper, based on the theoretical model of Volasov Poisson equation, molecular dynamics simulation method, linear dielectric response theory and Brandt-Kitagawa effective charge theory are used. The expressions of the interaction potential and stopping power of atomic ions in plasma are derived. The effect of laser parameters on the energy loss during the interaction of atomic ions with plasma is further discussed. Firstly, under the given laser angle 偽 = 蟺 / 3, plasma density n010 / 10 and electron temperature T_e=3eV, The energy loss of boron ion under the influence of laser field is studied. In the course of the study, we find that the laser field intensity has a certain effect on the energy loss of boron ion. It is found that the blocking power increases first and then decreases with the increase of the velocity, and decreases with the increase of the laser field strength. It is found that the blocking power of boron ion is also affected by laser frequency and laser angle. However, because of the difference of their nuclear charge number, they have different blocking power under the same laser field intensity. Therefore, the oxygen atom ion is simulated and studied. The results show that under the same laser field intensity, The blocking power of oxygen atom ion is greater than that of nitrogen atom ion, and that of nitrogen atom ion is greater than that of boron atom ion, that is, for different atomic types, The blocking power increases with the increase of the number of nuclear charges. The results show that the laser field intensity is an important parameter affecting the interaction between atomic ions and plasma, and the stopping power decreases with the increase of laser intensity. The blocking power of atomic ions increases first and then decreases with the increase of the velocity; in addition, the laser frequency and laser angle can also modulate the blocking power; as the number of atomic ion nuclear charges increases, The blocking power of atomic ions increases.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN249;O53

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