Technology development for a mm-wave sheet-beam traveling-wave tube

Carlsten, Bruce E.; Russell, Steven; Earley, L.M.; Krawczyk, Frank L.; Potter, J. M.; Ferguson, P.; Humphries, S.

doi:10.1109/tps.2004.841172

Cited by 88 publications

(36 citation statements)

References 9 publications

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“…The fact that emittance determines the focusing requirements for THz regime VEDs instead of space charge has been observed elsewhere, including Ref. 127. It is common to describe the nonlaminarity of conventional microwave tube electron beams using emittance.…”

Section: Another Look At Magnetic Focusing: Emittancementioning

confidence: 84%

Plasma physics and related challenges of millimeter-wave-to-terahertz and high power microwave generation

2008

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Homeland security and military defense technology considerations have stimulated intense interest in mobile, high power sources of millimeter-wave (mmw) to terahertz (THz) regime electromagnetic radiation, from 0.1 to 10THz. While vacuum electronic sources are a natural choice for high power, the challenges have yet to be completely met for applications including noninvasive sensing of concealed weapons and dangerous agents, high-data-rate communications, high resolution radar, next generation acceleration drivers, and analysis of fluids and condensed matter. The compact size requirements for many of these high frequency sources require miniscule, microfabricated slow wave circuits. This necessitates electron beams with tiny transverse dimensions and potentially very high current densities for adequate gain. Thus, an emerging family of microfabricated, vacuum electronic devices share many of the same plasma physics challenges that are currently confronting “classic” high power microwave (HPM) generators including long-life bright electron beam sources, intense beam transport, parasitic mode excitation, energetic electron interaction with surfaces, and rf air breakdown at output windows. The contemporary plasma physics and other related issues of compact, high power mmw-to-THz sources are compared and contrasted to those of HPM generation, and future research challenges and opportunities are discussed.

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Section: Another Look At Magnetic Focusing: Emittancementioning

confidence: 84%

Plasma physics and related challenges of millimeter-wave-to-terahertz and high power microwave generation

2008

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“…Important planar RF SWS that are recently being reported for a 0.22-THz TWT are: (i) staggered double-vane loaded rectangular waveguide SWS [6][7][8][9][10], (ii) meander line loaded rectangular waveguide SWS [11], (iii) Sine waveguide SWS [12], (iv) corrugated waveguide SWS [13], (v) H-plane and E-plane loaded rectangular waveguide SWS [14], (vi) single and double grating type SWS [15][16]. The staggered double-vane (on E-plane) loaded rectangular waveguide SWS, as shown in Fig.1 for a unit cell, is selected for the present design of a wideband 0.22 THz 100W TWT because it has wide bandwidth and high interaction impedance.…”

Section: Analytical Design Of Planar Rf Swsmentioning

confidence: 99%

Design of a Broadband Planar RF Structure for a 0.22 THz Travelling Wave Tube

Srivastava¹,

Sharma²

2017

ujeee

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Planar broadband THz travelling wave tube is being designed for ultra broadband high speed data rate communication and imaging. A simplified analytical approach is developed for designing of a planar staggered double vane rectangular waveguide slow-wave structure (SDVSWS) for a broadband 0.22 THz 100W TWT. The structure is inherently compatible for sheet beam operation, and it is designed for an electron beam of voltage 20 kV and current 50 mA. 3D e.m. field simulator code CST-MWS was used for simulating the SDVSWS using the analytical design parameters. It is found that the dispersion characteristic by the analytical method matches well within 5% with the simulated dispersion characteristic of the structure. Effects of various parameters of a double-vane SWS on dispersion and impedance characteristics are evaluated for achieving a planar TWT of bandwidth more than 40 GHz with high gain. It is shown that pitch and vane height are most significant parameters and half-period staggering of double vanes in the structure provides wider bandwidth, high impedance and high symmetric RF electric field for efficient beam-wave interaction.

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“…The triangle is enclosed by: 0 q 0:91; 0 a 1; a À1:1q þ 1. Combining Eqs.16, 17, the conditions are written: For illustration purposes, the beam considered in this paper is a sheet beam with the major axis r x =2.5 mm, the minor axis r y =0.5 mm, the beam current I=20A and the beam voltage U 0 =120KV [6,[13][14][15]18]. So: v b ¼ 1:76 Â 10 8 m=s ð21Þ…”

Section: Theoretical Analysismentioning

confidence: 99%

“…The clear conditions for stable sheet beam transport in PPM fields is very urgent and has been investigated for a long time [7][8][9][10][11][12][13][14][15][16][17]. By neglecting the influence of space-charge field and cyclotron motion, the previous works got vague conditions for stable sheet beam transport.…”

mentioning

confidence: 99%

The Conditions for Stable Sheet Electron Beams Transport in Periodic Permanent Magnet Fields

Wang

Gong

Wei

et al. 2010

J Infrared Milli Terahz Waves

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The stable focusing or transport of sheet electron beams is an essential technology for an emerging class of high-power high-frequency planar-structure microwave devices. This paper, in consideration of space-charge field and cyclotron motion, describes theoretical study and simulation on sheet beams transport in periodic permanent magnetic (PPM) fields. Based on the theoretical study, we obtain the clear conditions for the stable sheet beams transport in PPM field. And the three-dimensional simulations of the sheet beam transport are in good agreement with our theoretical study. Our research will be useful in further study and experimental.

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Technology development for a mm-wave sheet-beam traveling-wave tube

Cited by 88 publications

References 9 publications

Plasma physics and related challenges of millimeter-wave-to-terahertz and high power microwave generation

Plasma physics and related challenges of millimeter-wave-to-terahertz and high power microwave generation

Design of a Broadband Planar RF Structure for a 0.22 THz Travelling Wave Tube

The Conditions for Stable Sheet Electron Beams Transport in Periodic Permanent Magnet Fields

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