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The development's results of the 7-beam Ka-band TWT with high electronic efficiency (∼20%), the gain coefficient (∼50dB) and a broad band operating frequency (∼2.5%) are presented.
Beam Optics Analyzer (BOA) provides a new capability to model the RF modulated electron beam entering and exiting the output cavity of an Inductive Power Tube (IOT). For a given Q factor, we will present numerical results of a simple cylindrical cavity resonated by a RF modulated electron beam. The spent beam will be verified by a 2D Tesla simulation.
L-3 EDD has developed a pulsed mode W-Band microwave power module (MPM) providing 100W RF power over 92 to 96 GHz. The MPM includes a serpentine waveguide PPM-focused TWT and a modular electronic power conditioner (EPC). A breadboard power supply was previously built and successfully tested with a W-Band TWT. The final power conditioner design is completing development for packaging with a TWT as...
In this paper, the design of a magnetron injection gun (MIG) with a single-anode built for W-band gyrotron oscillator is presented. The simulation of the MIG is finished with the help of a trajectory program EGUN. The simulation results indicate that the velocity ratio with velocity spread of less than 4% is 1.41.
The new concept of symmetric (double-folded) and asymmetric (single-folded) folded meander-line slow-wave structures is proposed for broader bandwidth and higher interaction impedance characteristics, respectively. The structures are analyzed using 3D numerical simulation in CST-Microwave Studio for the dispersion and interaction impedance characteristics at Ka- and W-bands. The results are compared...
During last years several new gyrotrons were developed at IAP/GYCOM. Main efforts were spent for development 170GHz/1MW/50%/CW gyrotron for ITER and multi-frequency gyrotrons. The main ITER requirements to a gyrotron have been demonstrated: 1MW power, 1000 seconds pulse duration, 53% efficiency. The gyrotron operation regime of 1.2 MW was found for 100 second pulses. For a multi-frequency gyrotron...
L-3 Communications Electron Technologies (L-3 ETI) has recently tested a unit from the production family of Ku-band TWTs, the 88151HXR S/N 110, up to 200-W RF output power in thermal vacuum. Performance data and thermal analysis from the testing will be presented.
Design improvements and fabrication of a 10 MW, 1.3 GHz Annular Beam Klystron are described. The principal improvement is the electron gun. Utilization of a Controlled Porosity Reservoir (CPR) cathode allows the use of a zero-compression gun, resulting in improved beam quality and reductions in the gun and solenoid diameters.
Simulations of modern, high current electron beam lithography devices may require modeling of optical components and multiple electron sources that are positioned in an oblique fashion with respect to the main device axis and include counter streaming regions, where two beams are co-located in space while propagating in opposite directions. Modeling such complex multi-beam systems presents different...
Calabazas Creek Research, Inc. is developing a system for coupling radiation out of gyrotrons that eliminates the external matching optical unit and is broadband. A critical component is a Brewster window in HE11 waveguide. This paper describes the design and thermal-mechanical modeling of the window.
L-3 Communications Electron Technologies Inc., (L-3 ETI), continues to push the envelope for spacedownlink qualified mm-wave helix TWTs. We report results of high-power, wide bandwidth, and extreme environmental margin testing on the mm-wave family of helix TWTs from 22 GHz to 75 GHz.
The design work for 95 GHz, 100 kW gyrotron for Active Denial System (ADS) application is presented. The mode selection is performed considering the various technical constraints. Particle-in-Cell code is used for the beam-wave interaction computation and cavity design. In addition, the designs of electron beam source, collector and RF window are also discussed. The design results confirm the RF power...
A gyrotron operating at the second cyclotron harmonic in a magnetic field of 9.7 T has produced a CW output power of 25 W at 527 GHz. The gyrotron is now being employed in Dynamic Nuclear Polarization (DNP) Applications. The gyrotron design and results of the tests are presented.
The multiple beam klystrons (MBK) offer some distinct advantages over their single beam versions including higher average power, relatively lower operating voltages, higher bandwidth and low individual beam current. In this paper the design of the radio frequency (RF) section of a multiple beam klystron working in the J band frequency range is presented. The RF design and simulation has been carried...
This paper presents the preliminary results of using silicon nanowires for the fabrication of electron detectors suitable for scanning electron microscopy. The rather small size of the device allows its location just close to the specimen, hence increasing the detected current with no need to a complex optical device. The results of material variation as well as preliminary results of morphology changes...
We present two algorithmic improvements to enhance accuracy for large-signal simulations of vacuum electronic amplifiers using the GPU-accelerated, 3D time-domain particle-in-cell code “Neptune”. A new conformal (cut-cell) geometry model with a new algorithm for Ohmic surface loss accurately predicts the dispersive and dissipative electromagnetic properties of complex metal device structures.
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