Computer Simulations of Radiation Generation From Relativis-tic Electron Beams

PI建议使用改进的相对论电磁粒子 代码以及根据其先前的NSF开发的现有代码 赠款（ECS-8219105），以解决有关发电的关键问题 相对论性电子束的相干辐射。 仿真 研究将在微波范围内进行，并将包括 自由电子激光器、电子回旋脉塞和切伦科夫脉塞。 本研究将探讨：交流和直流空间电荷的影响 场的增益，谐振条件和非线性效率 各种大电流自由电子器件;横模 各种自由电子器件的竞争; 使用背景等离子体用于束DC空间电荷和电流 中和和使用之间的相互作用的可行性 相对论性电子束和等离子体填充波导， 相干辐射源;和切伦科夫微波激射器的效率， 平面介质波导和高次谐波回旋管 环绕着轴的大电子轨道。

The PI's propose to use improved relativistic electromagnetic particle codes as well as existing codes developed under their previous NSF grant (ECS-8219105) to address crucial issues concerning the generation of coherent radiation from relativistic electron beams. The simulation studies will be carried out in the microwave range and will include the free-electron laser, electron cyclotron maser, and Cherenkov maser. The research will investigate: the effects of ac and dc space charge fields on the gain, resonant condition and nonlinear efficiency of various high current free electron devices; the transverse mode competition in various free electron devices; the effectiveness of using a background plasma for beam dc space charge and current neutralization and the feasibility of using the interaction between relativistic electron beams and plasma filled waveguides to build coherent radiation sources; and the efficiency of a Cherenkov maser in a planar dielectric waveguide and a high-harmonic gyrotron using axis-encircling large electron orbits.