高温、高密度等离子体中的极化轫致辐射

The find of the Polarization Bremsstrahlung Radiations greatly changed the understanding of the Ordinary Bremsstrahlung Radiations that is also known as the Static Bremsstrahlung. The fact of the Polarization Bremsstrahlung Radiations exceeding the Static Bremsstrahlung Radiations in a broad frequence range shows that the Polarization Bremsstrahlung is a very important Bremsstrahlung channel comparing with the Static Bremsstrahlung channel. However, in most of important reseach field that is interesting in the plasma Bremsstrahlung Radiations, the Polarization channel hasn't been included in the calculation of the total Bremsstrahlung so that it lead to the wrong results in estimating the total Bremssrtrahlung radiations. Based on the ion-sphere model, the relativistic quantum theory and the Brandt -Lundquist method will be adpoted in this project to calculate the total Bremsstrahlung radiations after including the two Bremsstrahlung channels in the hot and dense plasma enviroument. The foundations of the hot and dense plasma Bremsstrahlung will be studied with the polarization channel, and also the Bremsstrahlung radiation cross section will be given under different dense plasma conditions. The giant resonance structure of the Polarization Brenmsstrahlung will be studied as a tool in dense plasma diagnostics. The calculation method for the total Bremsstrahlung under the two channel Bremsstrahlung mechanics will be given to support the research of some important fields including ICF.

极化轫致辐射通道的发现改变了对传统轫致辐射（静力学轫致辐射）的认识。高温、高密度等离子体中极化轫致辐射在一定频率范围内将远超过静力学轫致辐射揭示出极化轫致辐射通道对等离子体轫致辐射的重要贡献。然而大多涉及高温、高密等离子体轫致辐射及逆过程的研究都只包含静力学轫致辐射通道，造成在很宽频谱范围内对轫致辐射分布的计算结果是不正确的。 本项目基于全相对论自洽场离子球方法和Brandt-Lundquist局域等离子体频率近似探讨包含极化通道的高温、高密度等离子体轫致辐射，包含：静力学轫致辐射、极化轫致辐及其干涉效应射在高温、高密度等离子体中的基础物理规律；给出极化轫致辐射的巨共振结构和等离子体参数的关系，同时探索利用连续辐射进行等离子体诊断的新方法；给出双通道轫致辐射原理下总轫致辐的计算方法,为ICF等重要领域提供双通道原理下对高温、高密等离子体轫致辐射规律及现象的新认识。

极化轫致辐射通道的发现丰富了对传统轫致辐射（正常轫致辐射）的认识，揭示了等离子体产生连续辐射的新机制。关于极化轫致辐射对高温、高密等离子体轫致辐射及其逆过程的影响一直是个并不清楚的问题，研究和认识极化轫致辐射的特征、物理机理以及其对等离子体轫致辐射影响是本课题的主要研究内容。 本项目基于全相对论自洽场离子球方法和Brandt-Lundquist局域等离子体频率近似探讨包含极化轫致辐射通道的高温、高密度等离子体轫致辐射，建立了等离子体双通道轫致辐射计算模型、计算方法和计算程序。结果表明极化轫致辐射和正常轫致辐射具有完全不同的谱特征，揭示了极化轫致辐射谱的双峰结构及形成双峰结构的内在物理机制，并详细研究了极化轫致辐射与相关等离子体参数及相关物理参数的关联，定性、定量地揭示了等离子体极化轫致辐射的规律。同时，对等离子体总轫致辐射的计算表明，温密等离子体中极化轫致辐射并非等离子体连续辐射的主要通道，正常轫致辐射在等离子体连续辐射中依然起主导作用。虽然如此，由于极化轫致辐射的具有明显的辐射特征，利用其本身的特征进行进行等离子体诊断的是值得探索的新方法。