Magnetron simulations using a moving wavelength computer code

McDowell, H.L.

doi:10.1109/27.700819

Cited by 20 publications

(10 citation statements)

References 18 publications

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“…A-I for the case where the side resonators are filled with a medium with the following anisotropic permittivity and permeability is obtained from (8).…”

Section: (6)mentioning

confidence: 99%

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Application of metamaterials in spatial harmonic magnetrons

Esfahani

Schünemann

2015

2015 IEEE MTT-S International Microwave Symposium

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In this paper, it is shown that employing epsilon near zero meta materials (ENZ) in the slow wave structure of a spatial harmonic magnetron can increase the efficiency and average output power of this type of magnetron. An approximate beam-wave interaction analysis which paves the way for introducing the ENZ loaded SWS is presented.Numerical simulations of the beam-wave interaction confirm the superiority of the ENZ loaded SWS to its conventional counterpart.Index Terms -Anisotropic, electron beam, magnetron, meta materials, millimeter wave devices.978-1-4799-8275-2/15/$31.00 ©2015 IEEE

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“…A-I for the case where the side resonators are filled with a medium with the following anisotropic permittivity and permeability is obtained from (8).…”

Section: (6)mentioning

confidence: 99%

“…In a conventional SWS with c l(! =,uz=l, A_I is restricted to values smaller than 0.42 (see (8)). Considering Fig.…”

Section: (6)mentioning

confidence: 99%

Application of metamaterials in spatial harmonic magnetrons

Esfahani

Schünemann

2015

2015 IEEE MTT-S International Microwave Symposium

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“…CFA designs are often made by scaling from existing designs using the characteristic scaling variables in Collins [14]. (An alternate form of these variables is to be found in the Appendix of the author's previous magnetron paper [2]. A correction to the formulas is found in the Appendix to this paper.)…”

Section: Description Of the Codementioning

confidence: 99%

“…Results of Manuscript the computer simulations correlate reasonably well with experimental observations and yield useful insight into the internal space-charge states in these devices. The author has previously published the results of the application of a similar code to magnetrons [2] in this TRANSACTIONS. The magnetron results showed a highly chaotic space-charge state when emission was dependent on secondary emission (secondary emission dominated state) as is the case in most magnetrons and CFAs.…”

Section: Introductionmentioning

confidence: 98%

Crossed-field amplifier simulations using a moving wavelength computer code

McDowell

2002

IEEE Trans. Plasma Sci.

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A moving wavelength particle in cell computer code has been used to study the interaction in emitting sole crossed-field amplifiers (CFAs). Results of the study of magnetrons using a related code have been published previously. The CFA results echo many of the features of the magnetron results. Application of the code to a cold cathode, pulsed CFA showed the existence of chaotic fluctuations in the space charge which we believe are related to noise in experimental CFAs. A major feature of these fluctuations is voids in the charge above the cathode which propagate slower than the RF wave (and, hence, travel backward in the moving reference frame). As the voids pass beneath the base of the spokes they modulate the amount of charge entering the spokes and enhance the chaotic behavior. The spokes recirculate from output to input becoming partially debunched in the process. Differing amounts and distributions of the space charge recirculated result in the computed power and phase pushing varying from pass-to-pass of the moving wavelength around the CFA anode. The fluctuations in field at the cathode and the pass-to-pass fluctuations are used as a measure of the fluctuation of the simulation. Two alternative designs have been investigated in an attempt to reduce CFA noise. A nonreentrant design eliminates the pass-to-pass fluctuations. However, the simulations show internal fluctuations commencing shortly after the space charge has built up. Experimentally, noise of this CFA was improved over the baseline design by from 4 to 8 dB depending on the operating frequency. Simulation of an alternate reentrant design with a thermionic cathode capable of a current density which will support a "Slater" solution of the sheath trajectories, showed elimination of the internal space-charge fluctuations. Experimentally, noise of this CFA was improved by 10-30 dB over that of the baseline CFA. Fluctuations observed in the simulations are believed to be a qualitative model of noise generation phenomenon and may help point the way to future reduction of such noise.

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“…The rf power generation capability of the TM011 locked circuit shown in Figure 4 has been predicted using a computer program called DEMAG [2]. This program is proprietary to CPI and is maintained and improved by Hunter L. McDowell.…”

Section: Predicted Performancementioning

confidence: 99%

Design of an Inverted TM011 Cavity Locked HPM Magnetron

Tracy

2006 IEEE International Vacuum Electronics Conference Held Jointly With 2006 IEEE International Vacuum Electron Sources

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Magnetron simulations using a moving wavelength computer code

Cited by 20 publications

References 18 publications

Application of metamaterials in spatial harmonic magnetrons

Application of metamaterials in spatial harmonic magnetrons

Crossed-field amplifier simulations using a moving wavelength computer code

Design of an Inverted TM011 Cavity Locked HPM Magnetron

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