Electromagnetic properties of open and closed overmoded slow-wave resonators for interaction with relativistic electron beams

Main, W.; Carmel, Y.; Ogura, K.; Weaver, James L.; Nusinovich, G. S.; Kobayashi, Satoru; Tate, J.P.; Rodgers, J.; Bromborsky, A.; Watanabe, Shun; Amin, Md. Ruhul; Minami, Kazuo; Destler, W.W.; Granatstein, V.L.

doi:10.1109/27.338269

Cited by 68 publications

(17 citation statements)

References 16 publications

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“…The theory of perfectly periodic RF structures has been extensively developed over many years, motivated largely by the many practical applications of periodic structures such as filters, antennas, and slow wave circuits, [1] and [2]. Of course, the practical realization of a periodic structure is never perfect, due to fabrication tolerances and/or variations in material properties from cell to cell.…”

Section: Introductionmentioning

confidence: 99%

Non-periodic perturbations in periodic RF structures

Jabotinski¹,

Chernin

Antonsen

et al. 2011

2011 IEEE MTT-S International Microwave Symposium

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Fig.1. Schematic, cutaway view of a cavity used in extended interaction klystrons. The 'ladder' consists of periodically placed slots in a metal sheet.Abstract -This paper presents analysis of the effects of nonperiodic perturbations in periodic RF structures with the use of 3D finite element computer simulations. Small departures from periodicity change the phase shift experienced by a wave as it traverses an imperfect cell. Cell imperfections may be introduced intentionally or due to fabrication errors or material properties variations. The accumulated effects produce distortions of the fields. If the errors are large enough the structure modes become localized. We believe that this is the first demonstration of localization in a periodic RF structure in which the transverse and period dimensions are on the order of a wavelength. The phenomenon is similar to Anderson localization but has its own unique mechanisms. These results are demonstrated in a periodic structure being designed for a 670 GHz extended interaction klystron. In an ancillary result we document a limitation of finite element codes when applied to long periodic structures.

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Section: Introductionmentioning

confidence: 99%

Non-periodic perturbations in periodic RF structures

Jabotinski¹,

Chernin

Antonsen

et al. 2011

2011 IEEE MTT-S International Microwave Symposium

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“…Finally, to shorten the interaction region the PASOTRON slow-wave structures are usually characterized by significant end reflections which cause transformation of a continuous ͑within the passband͒ spectrum of a wellmatched periodic slow-wave structure ͑SWS͒ into a discrete spectrum of standing modes with the same transverse structure but different numbers of axial variations. 6,7 The theory of relativistic BWOs with end reflections was developed in Ref. 6.…”

Section: Introductionmentioning

confidence: 99%

Mode interaction in backward-wave oscillators with strong end reflections

Nusinovich

Bliokh

2000

Physics of Plasmas

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“…In the Pasotron, this depends on the amount of plasma generated by the beam that is required for sufficient beam propagation through the SWS with little or no applied magnetic field, 11 in order to support the oscillation. For trace ͑a͒ shown in Fig.…”

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confidence: 99%