Rosario Martorana

Terra

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Co-Authors

G. Pollicino

University of Catania

Roberto Dionisio

European Space Research and Technology Centre

Antonino Laudani

University of Catania

S. Coco

Polytechnic University of Turin

Antonino Mistretta

Space (Italy)

Antonino Muratore

University of Palermo

David Bisconti

Leonardo (United Kingdom)

Agostino Nicosia

SELEX Sistemi Integrati

J. Feinstein

Stanford University

Patrizia Livreri

University of Palermo

Cooperative Institutions

Istituto Nazionale di Geofisica e Vulcanologia

Varian Medical Systems (United States)

University of Palermo

University of Catania

Space (Italy)

Stanford University

Calabazas Creek Research (United States)

Leonardo (Italy)

Stanford Synchrotron Radiation Lightsource

SLAC National Accelerator Laboratory

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Electromagnetic analysis by finite elements of electron guns for traveling wave tubes

S. Coco Stefania Corsaro Roberto Dionisio Antonino Laudani Rosario Martorana

Electron guns are used as electron beam source in a wide variety of devices including traveling wave tubes (TWT), klystrons and particle accelerators. Usage of more complex geometries and insertion of control grid allow the designer to obtain a better performance but it requires specialized 3D numerical simulators to carry out the design process. In this paper we present the COLLGUN simulator, a 3D tool for the design of TWT's electron gun. The complete simulator consists of three main modules: a dedicated fully 3D Finite Element mesh generator, a 3D FE Vlasov solver, including space-charge effects, with an integrated electron trajectory tracer and a graphic post-processing module for result restitution. Several examples of 3D simulation of electron guns have been analyzed to test the simulator.

Klystron

Traveling-wave tube

Electron gun

Solver

10.1109/ivelec.2004.1316340

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Citations (0)

3-D Finite-Element Analysis of TWT Grid Electron Guns

IEEE Transactions on Magnetics (2007)

S. Coco Antonino Laudani G. Pollicino Roberto Dionisio Rosario Martorana

A novel three-dimensional FE procedure for the analysis of electron guns inside traveling wave tubes (TWTs) is presented, illustrating its main features. In this procedure, electron trajectories modeling cathode emission are obtained by solving a Vlasov-Poisson system of equations together with the relativistic dynamical equations of motion, under consistent particle injection conditions. This coupled electromechanical problem is solved iteratively by assuming stationary conditions. Simulation results concerning a gridded electron gun are presented, showing good agreement with available experimental data

Electron gun

Poisson's equation

10.1109/tmag.2006.890966

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Citations (11)

“Semi-metallic rods” structure for controlling the phase velocity dispersion in helix TWT

Rosario Martorana Agostino Nicosia Galileo Avionica

Telecommunication transmissions require high power linear amplifiers operating in C, X and Ku bands due to the necessity to manage a large amount of information.

Helix (gastropod)

Rod

10.1109/ivelec.2008.4556450

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Citations (1)

Design and test of an 8 GHz, 500 kW, side-coupled gyrotron

L. Ives K. Felch Carl Hess H. Jory R. Pendleton

An 8-GHz, 500-kW gyrotron oscillator is being developed for lower hybrid heating of the FTU tokamak in Italy. The final system will be required to deliver 8 MW of RF power, to operate for one second very 10 minutes, and to continue RF operation into a 4:1 voltage standing wave ratio. A tube is being developed that couples the power from the interaction circuit directly into the fundamental, rectangular waveguide. This represents a major departure from previous designs where the power is extracted axially in an overmoded, circular guide. The gyrotron operates at 95 kV and 12 A with the RF output in two waveguides carrying 250 kW each. A standard magnetron injection gun is used with a loading of 3.2 A/cm/sup 2/. Considerable design effort has been required to develop a circuit that will operate at high efficiency without severe mode competition. Techniques were developed to reduce mode conversion and azimuthal distortion of the cavity fields and ensure operation in the desired axial mode. The mechanical characteristics, gun design, circuit, collector, and window design are described.< >

Gyrotron

Waveguide

10.1109/iedm.1988.32776

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Citations (2)

Development of 150 W, Ka Band TWT for Payload Data Transmitter

Rosario Martorana Antonio Mendolia Calella Giovanni Li Calsi

Ka band

Payload (computing)

10.1109/ivecivesc60838.2024.10694944

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Pre-development of a C-band klystron intended for synthetic aperture radar in space application

Rosario Martorana David Bisconti Antonino Mistretta Antonino Muratore

A C-band klystron has been developed at Leonardo company, based on an European Space Agency (ESA) contract, targeting a Synthetic Aperture Radar (SAR) instruments that are essential for Earth Observation application. The paper presents the design features of the klystron, with particular emphasis on the main critical parameters (RF performances and potential multipaction issues). The development has been concluded with an elegant breadboard (EBB) fully representative of the klystron design. The test results on these models are presented; they demonstrate the capability of the design to meet the target requirements. The view expressed herein can in no way be taken to reflect the official opinion of the European Space Agency.

Klystron

Breadboard

Aperture (computer memory)

10.1109/ivec.2017.8289555

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Study of a 1.5 KW average output power CC-TWT with a 10% banwidth operating in X-band

Antonino Mistretta David Bisconti Rosario Martorana Antonino Muratore Antonino Muratore

A three-section coupled cavity TWT is under development for avionic application. The design parameters point out for a TWT in X-band with an high average power, high power, high efficiency, high duty, wide band, low weight and rugged structure. Data are presented which show as preliminary results of simulations are in agreement with the tests on each RF section. The simulations have been done with a software developed in house for the evaluation of the impedance interaction and use of CST suite has been done for the prediction of the dispersion diagram.

Operating point

10.1109/ivec.2017.8289556

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Citations (1)

Development of tri-band helix TWT for telecommunications using “Semi-metallic Rods” structure

Rosario Martorana Agostino Nicosia

Telecommunication transmission systems require high power linear amplifiers operating in C, X and Ku bands due to the necessity to manage a large amount of information. The helix TWT amplifier is the device adequate for this application since it can provide wide bandwidth and high power level at high frequencies. Selex Galileo is developing a high power helix TWT operating from C to Ku band using the novel RF interaction structure "Semi-metallic Rods ". The test results of the first electrical model are presented in this paper.

Helix (gastropod)

Rod

10.1109/ivelec.2009.5193369

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Citations (1)

A FE tool for the electromagnetic analysis of slow-wave helicoidal structures in Traveling Wave Tubes

S. Coco Antonino Laudani G. Pollicino Roberto Dionisio Rosario Martorana

In this paper, the authors present a finite element tool expressly conceived for the analysis of TWT helicoidal SWSs. The tool includes a dedicated mesh generator, an eigenmode and a driven mode solver, and a post-processing module. Examples of typical SWS analysis performed by using the tool are also given

Solver

Mode (computer interface)

Traveling-wave tube

Electromagnetic simulation

10.1109/cefc-06.2006.1633285

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COLLGUN: a 3D FE Simulator for the Design of TWTs Electron Guns and Multistage Collectors

Mathematics in industry (2006)

S. Coco Stefania Corsaro Antonino Laudani G. Pollicino Roberto Dionisio

10.1007/978-3-540-32862-9_25

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Citations (6)