RESEARCH INITIATION: Spectroscopy and Kinetics of Long Pulse Electron Beams

长脉冲相对论电子束（LPREB）已被研究用于自由电子激光、加速器技术和高功率微波系统。然而，在检查LPREB在可见光和紫外气体激光系统中的应用方面，几乎没有做过什么工作。本研究的目的是使用两个电子束加速器研究LPREB产生的等离子体的可见光和近紫外发射，并使用基于速率方程的化学动力学计算机模型来解释这些结果。惰性气体等离子体（He， Ar和Ne）的时间分辨可见和紫外发射光谱将在两台加速器上进行。一种加速器是电压为500kv，电流为1.4 kA，脉冲长度为250ns的Febetron。第二个加速器是密歇根电子长束加速器（MELBA），电压为1mv，电流为10ka，脉冲长度为1us。实验改变压力、电流和电压值、脉冲长度和气体成分。利用计算机模型规划了有前途的参数体系的理论研究，以优化特定的结果，并表明LPREB用于气体激光系统的潜力。

Long pulse relativistic electron beams (LPREB) have been studied for use in free electron lasers, accelerator technology, and high power microwave systems. Little work has been done, however, in examining LPREB for applications to visible and ultraviolet (uv) gas laser systems. The purpose of the research is to study the visible and near uv emission of LPREB produced plasmas using two electron beam accelerators and to interpret these results using a rate equation based computer model of the chemical kinetics. Time resolved visible and uv emission spectroscopy of inert gas plasmas (He, Ar and Ne) will be performed on two accelerators. One accelerator is the Febetron with voltage equalling 500 kV, current equalling 1.4 kA, and pulse length 250 ns. The second accelerator is the Michigan Electron Long Beam Accelerator (MELBA) with voltage of 1 MV, current of 10 kA, and pulse length of 1 us. The experiments vary pressure, current, and voltage values, pulse length, and gas composition. Theoretical studies of promising parametric regimes are planned with the computer model to optimize particular results and to indicate the potential of LPREB for gas laser systems.