Journal ArticleDOI
Modeling Vacuum Electronic Devices Using Generalized Impedance Matrices
Igor A. Chernyavskiy,Thomas M. Antonsen,John C. Rodgers,Alexander N. Vlasov,David Chernin,Baruch Levush +5 more
TLDR
A general approach to modeling a large class of vacuum electronic devices (VEDs) by using impedance matrices to characterize the circuit structure, which can treat VEDs that have an arbitrary number of interaction gaps, severs, and input and/or output ports that may incorporate arbitrarily complex matching and/ or tuning elements and windows.Abstract:
We have developed a general approach to modeling a large class of vacuum electronic devices (VEDs) by using impedance matrices to characterize the circuit structure. Our approach can treat VEDs that have an arbitrary number of interaction gaps, severs, and input and/or output ports that may incorporate arbitrarily complex matching and/or tuning elements and windows. To find the impedance matrix for a given structure, we use the computational electromagnetics 3-D finite-element code HFSS to compute the response of the entire structure to an excitation of each individual port and gap. We define voltages and currents as certain integrals over the electric and magnetic fields, respectively, the ratios of which are elements of the generalized impedance matrix. This matrix is then imported into a beam-wave interaction code, which is used to compute VED performance (gain, output power, bandwidth, and so on). We have implemented this capability in a new 2-D code TESLA-Z, which has been verified by comparison with the large-signal code TESLA-FW and then validated by comparison with measured data from a Ka-band folded-waveguide power-booster TWT. Similar capability was also implemented in the 1-D interaction code CHRISTINE-CC.read more
Citations
More filters
Journal ArticleDOI
Performance of a Nano-CNC Machined 220-GHz Traveling Wave Tube Amplifier
Anisullah Baig,Diana Gamzina,Takuji Kimura,John Atkinson,Calvin Domier,Branko Popovic,Logan Himes,Robert Barchfeld,Mark Field,Neville C. Luhmann +9 more
TL;DR: In this article, the authors report on hot test measurements of a wide-bandwidth, 220-GHz sheet beam traveling wave tube amplifier developed under the Defense advanced research projects agency (DARPA) HiFIVE program.
Journal ArticleDOI
Demonstration of a W -Band Traveling-Wave Tube Power Amplifier With 10-GHz Bandwidth
Alan M. Cook,Edward L. Wright,Khanh T. Nguyen,Colin D. Joye,John C. Rodgers,Reginald L. Jaynes,Igor A. Chernyavskiy,Frank Wood,Benjamin S. Albright,David K. Abe,Jeffrey P. Calame,Baruch Levush,Dean E. Pershing,John Atkinson,Takuji Kimura +14 more
TL;DR: In this paper, a traveling-wave tube (TWT) power amplifier operating in the ${W}$ -band (75-110 GHz) frequency range is presented, which is based on a serpentine waveguide (SWG) amplification circuit, a slow wave circuit type capable of high power and broad instantaneous bandwidth.
Journal ArticleDOI
A Novel Scheme for Gain and Power Enhancement of THz TWTs by Extended Interaction Cavities
Shi Ningjie,Huarong Gong,Sheel Aditya,Yubin Gong,Changqing Zhang,Shaomeng Wang,Hanwen Tian,Wei Shao,Zhanliang Wang,Tao Tang,Zhaoyun Duan,Zhigang Lu +11 more
TL;DR: In this article, a novel scheme is proposed for the enhancement of the gain and output power of terahertz (THz) traveling-wave tube (TWT) amplifiers, which combines a slow-wave structure (SWS) and multigap resonant cavities, resulting in a complementary hybrid of traveling wave and standing wave elements, thus offering a compact circuit length.
Journal ArticleDOI
Numerical Determination of Vacuum Electronic Device Stability
TL;DR: A new approach to the study of the stability of vacuum electronic devices (VEDs) using the Naval Research Laboratory (NRL) large-signal code TESLA-Z is presented and its application to an experimental G-band serpentine TWT is illustrated.
Proceedings ArticleDOI
Advanced large-signal modeling of Multiple-beam Klystrons using generalized impedance matrix approach
Igor A. Chernyavskiy,John C. Rodgers,Alexander N. Vlasov,David K. Abe,Baruch Levush,Thomas M. Antonsen,Khanh T. Nguyen,Dean E. Pershing +7 more
TL;DR: An overview of the latest advances in the code development and modeling using parallel version of the large-signal code TESLA-Z, based on impedance matrix approach, is presented.
References
More filters
Journal ArticleDOI
MAGY: a time-dependent code for simulation of slow and fast microwave sources
TL;DR: The Maryland gyroklystron (MAGY) as mentioned in this paper was developed for modeling of slow and fast microwave sources, which includes a time-dependent description of the electromagnetic fields and a self-consistent analysis of the electrons.
Journal ArticleDOI
Conversion of Maxwell's equations into generalized Telegraphist's equations
TL;DR: In this paper, the Generalized Telegraphist's Equations (GTE) were derived from the classical Telegraphist Equations and applied to the problem of wave propagation on wires.
Journal ArticleDOI
Recent developments to the MICHELLE 2-D/3-D electron gun and collector modeling code
TL;DR: The MICHELLE electron gun and collector tool as mentioned in this paper is a finite element (FE) two-dimensional and three-dimensional electrostatic particle-in-cell code that has been designed to address the recent beam optics modeling and simulation requirements for vacuum electron devices, ion sources, and charged particle transport.
Journal ArticleDOI
Advances in modeling and simulation of vacuum electronic devices
TL;DR: The state of the art in device simulation is evolving to the point such that devices can be designed on the computer, thereby eliminating many trial and error fabrication and test steps.
Journal ArticleDOI
A General Equivalent Circuit for Coupled-Cavity Slow-Wave Structures
TL;DR: In this article, a number of structures of the slot-coupled cavity chain type are used in high-power traveling-wave tubes and different relationships between the structure pass bands and the cavity and slot resonances are found to exist.