A novel source for broadband millimeter-wave RF is being designed at Los Alamos National Laboratory utilizing the two-stream instability. This RF source offers the potential for consistent output power over a large bandwidth on a single device. The source is designed to use two co-axial electron beams coupled into solenoidal magnetic fields. This is accomplished using two cathodes independently modulated nested in each other. The electron beam energy from the innermost cathode will fall in the range between 15 and 20 keV with the beam energy from the outer cathode being 75%–95% of the inner beam energy. In order to efficiently match the beam from the outer cathode into the solenoidal magnetic field, shields are used around the cathodes to shape the electric field in the gun region to extend the electrostatic focal length of the beams for better coupling into the magnetic field. We present the design of electron guns and expected performance using Trak simulations.

中文翻译：

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利用两流不稳定性产生毫米波射频的同轴电子枪

洛斯阿拉莫斯国家实验室正在利用两流不稳定性设计宽带毫米波RF的新型信号源。该射频源提供了在单个设备上在大带宽上保持一致输出功率的潜力。该源设计为使用耦合到螺线管磁场中的两个同轴电子束。这是通过使用两个相互独立调制的阴极来实现的。来自最内阴极的电子束能量将落在 15 至 20 keV 的范围内，而来自外阴极的电子束能量为内束能量的 75%–95%。为了有效地将来自外阴极的光束匹配到螺线管磁场中，在阴极周围使用屏蔽来塑造枪区中的电场，以延长电子束的静电焦距，以便更好地耦合到磁场中。我们使用 Trak 模拟展示了电子枪的设计和预期性能。