Multiphysics modeling based design of a key-holes magnetron

Leggieri, Alberto; Passi, Davide; Paolo, Franco Di

doi:10.1109/nemo.2014.6995658

Cited by 9 publications

(20 citation statements)

References 1 publication

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“…MM computation moved the mesh in function of the displacement computed by the TM analysis. Subsequently, ES and CPT L computations have been executed on the new meshes and by receiving the temperatures evaluated by the TM study [7]. A schematization of the computational strategy is represented in Fig.…”

Section: Electron Gun Design and Multiphysics Modelmentioning

confidence: 99%

“…The TM analysis is performed by coupling a thermodynamic computation with a structural mechanics simulation, in order to solve the system of steady state stress and heat equations shown in Fig.2 [7]. The value is the stress and V F is the force per unit volume; is the density, C p the heat capacity at constant pressure, and k the thermal conductivity of the material.…”

Section: A Thermo-mechanical Analysismentioning

confidence: 99%

“…2 [7], where V is the volumetric charge density, D the dielectric displacement vector and V the voltage. Since the anode is grounded, its electric potential is set to zero and the cathode electric potential is set to V k = -10 KV.…”

Section: B Beam Dynamicsmentioning

confidence: 99%

“…The CPT analysis is employed to calculate the particle trajectories considering the ES computation, by solving the CPT equations shown in Fig.2 [7]. The values m p and v are respectively the particle mass and velocity, t F the total force experienced by the particle.…”

Section: B Beam Dynamicsmentioning

confidence: 99%

“…On the deformed geometry the particle trajectory has been computed. Since the Electrostatic (ES) fields are altered by the particles presence, the problem has been solved for the particles and fields simultaneously by coupling a Charge Particle Tracing (CPT) and an ES analysis [7].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Advanced design of a low energy electron source

Leggieri

Passi

Paolo

et al. 2015

2015 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)

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Abstract-A multiphysics-based modeling design of a low energy electron source using a thermionic cathode is described in this paper. The proposed device produces a narrow beam employable in delicate applications where dimensions are critical. The effects of multiple physics influencing factors due to the cathode heating over the beam dynamics have been predicted through a multiphysics design approach. This paper would provide the needed knowledge for virtual prototyping of such devices. For this aim, several strategies have been adopted to obtain a simple model, which shows clearly the investigated mechanisms. According to this study, the appropriate materials and shapes can be chosen.

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Section: Electron Gun Design and Multiphysics Modelmentioning

confidence: 99%

Section: A Thermo-mechanical Analysismentioning

confidence: 99%

Section: B Beam Dynamicsmentioning

confidence: 99%

Section: B Beam Dynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Advanced design of a low energy electron source

Leggieri

Passi

Paolo

et al. 2015

2015 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)

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An Innovative Lens Type FinLine to Microstrip Transition

Valletti

Fantauzzi

Paolo

2022

J Infrared Milli Terahz Waves

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Due to the disadvantages of vacuum tubes in terms of warm-up time, size, and high-voltage needs, solid-state power amplifiers (SSPAs) with gallium nitride (GaN) monolithic microwave integrated circuits (MMICs) are the key solution for power levels up to some kilowatts in continuous wave. An SSPA is the most convenient solution for these RF power levels due to its low weight, small size, negligible warm-up time, low-voltage operation, and high reliability. Spatial power amplifiers (SPAs) combining techniques are the best candidates for SSPAs due to the intrinsic low attenuation in dividing and combining functions. SPAs mainly use two types of probes: transverse and longitudinal, such as FinLines. This paper describes a broadband FinLine to microstrip (FLuS) transition based on dielectric lens theory. Comparative simulations with traditional FinLine transitions show a significant improvement in matching performances and a very significant increase in mechanical resistance of the transition. The proposed innovative FLuS uses a substrate shaping designed according to dielectric lens theory. Frequency simulations of a FLuS inside the WR22 waveguide are shown. These evidence the better performances of this transition than the classic FLuS transition using quarter-wave transformer (QWT) matching. A Q band spatial power combiner with dielectric lens FLuS was made and measured, showing the excellent performances of this innovative FLuS transition.

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Multiphysics Design of a Magnetron High Power Transfer System

Leggieri

Passi

Felici

et al. 2014

2014 European Modelling Symposium

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This paper proposes a particular design technique of an X-Band Magnetron to Linear Accelerator (LINAC) High Power Transfer System consisting in an 8 resonant cavities Magnetron connected to a dedicated vacuum Dielectric Window (DW). Such study is based on a Multiphysics modeling and considers thermal-structural effects due to the cathode heating for the Magnetron and the Joule effect for the DW. In this paper, is shown how to compensate the thermal\ud induced degradation of the device performances, by exploiting the consequent Thermo - mechanical deformation of the\ud opportunely designed device shape, which modifies constructively the electromagnetic (EM) fields to re-increase\ud performances. The proposed study provided the evaluation of the Magnetron Working Points and DW Scattering parameters in Thermo - mechanical operative conditions

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Multiphysics modeling based design of a key-holes magnetron

Cited by 9 publications

References 1 publication

Advanced design of a low energy electron source

Advanced design of a low energy electron source

An Innovative Lens Type FinLine to Microstrip Transition

Multiphysics Design of a Magnetron High Power Transfer System

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