Conveners
2.2 Fast-Wave Devices and 2.4 Vacuum Microelectronics and THz Devices
- Edl Schamiloglu (University of New Mexico)
We are developing high gradient linear accelerator technologies that operate at 100s of GHz and THz frequencies. Vacuum RF breakdown is one of the fundamental factors limiting high gradient performance of these linacs. Accordingly, a comprehensive study of RF breakdown physics in mm-wave accelerating structures is needed, which includes understanding of dependencies of the breakdown rate on...
Recently, sheet electron beam traveling-wave tubes are actively researched in the terahertz regime (0.3 - 3 THz). Sheet electron beams have several advantages over conventional pencil beams such as higher beam current and more interaction space.
There are several challenges in using sheet electron beams. One of the difficulties of sheet electron beams is generation of low-emittance beam with...
Experimental results are presented for the design, development, and test of a 94 GHz, extended interaction klystron (EIK) amplifier, utilizing a photonic slow-wave circuit. The EIK features uncharacteristically large physical dimensions, such as an oversized electron beam tunnel, directly contrasting conventional frequency scaling laws of vacuum electron devices. The circuit was fabricated...
We present recent experimental results of a 272 GHz energy-recirculating folded waveguide traveling-wave tube oscillator (FWTWTO), developed in Ulsan National Institute of Science and Technology (UNIST) in South Korea.
The developed device is driven by a backward wave oscillator with an initial electron beam and the generated radio frequency (RF) signal is amplified in the traveling-wave tube...
When designing relativistic high power microwave sources operating at high frequency one must combine high power handling with small structures in order to prevent from mode competition. This consequently leads to high power density levels with the risk of power breakdown inside of the microwave source. The triaxial configuration offers a solution to this tradeoff where the electronic beam is...