High power W-band klystrons

Caryotakis, G.; Scheitrum, G.; Jongewaard, E.; Vlieks, A.E.; Fowkes, R.; Song, Limei; Li, Jeff

doi:10.1063/1.59033

Cited by 5 publications

(4 citation statements)

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“…These devices currently deliver peak output powers of over 100 kW and over 200 kW, respectively. Design of a W-band multi-beam klystron that embodies several 100 kW "klystrinos" is also currently underway [4]. Furthermore, a preliminary design has been published for a 7.5 MW, W-band three-cavity second-harmonic gyro-klystron [5].…”

Section: Introductionmentioning

confidence: 99%

10-MW, W-band RF source for advanced accelerator research

Hirshfield¹,

Nezhevenko²,

Wang³

et al. 2001

AIP Conference Proceedings

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A conceptual design is presented for a W-band RF source that should be suitable for testing advanced accelerator structures and related components. The source is an 8 th -gyroharmonic converter, in which 28 MW of Xband power at 11.424 GHz is used to energize and spin up an injected 500 kV, 40 beam in a TE 111 cavity; and in which over 10 MW of W-band power at 91.392 GHz is extracted from the beam in a TE 811 output cavity. A mode converter is employed to provide a Gaussian output beam.

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Section: Introductionmentioning

confidence: 99%

10-MW, W-band RF source for advanced accelerator research

Hirshfield¹,

Nezhevenko²,

Wang³

et al. 2001

AIP Conference Proceedings

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“…The power level of BWOs reviewed in Refs. [4][5][6]. Recent experiments with developed by the Russian corporation "Istok" varies from submillimeter-wave orotrons7 resulted in delivering up to 1-10 mW at frequencies 260-375 GHz down to 0. of presently available codes three-dimensional (3D) simAn alternative version of a compact oscillator, which can ulations also can be performed.…”

Section: (1)mentioning

confidence: 99%

Miniature Electron Sources for Tomorrow's Vacuum THz Devices (MiPRI)

Carmel¹,

Nusinovich²,

Rodgers³

et al. 2006

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to the Department of Defense, Executive Services and Communications Directorate (0704-0188). Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ORGANIZATION. REPORT DATE (DD-MM-YYYY) 12. REPORT TYPEf3. DATES COVERED (From -To) SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)Dr AFRL-SR-AR-TR-06-0330 SUPPLEMENTARY NOTES ABSTRACTThe most significant experimental accomplishment was the demonstration that plasma-assisted miniature cathodes can generate high perveance electron beams at low voltages (>1000A/cm2; 0.5-3kV), and that those beams could propagate without external guiding magnetic fields over distances compatible with the length of the RF structure of THz sources. Out theoretical studies showed that this will enable the design of future THz sources operating with relatively high efficiency at high power levels. SUBJECT MINIATURE ELECTRON SOURCES FOR TOMORROW'S VACUUM THz DEVICES (MiPRI)Final Introduction and identification of the challengesThere has been a recent explosion of interest in using terahertz (THz) radiation to various applications in chemistry, biology, physics (spectroscopy), medicine, material science and imaging. This interest is motivated by the fact that the THz part of the spectrum is energetically equivalent to many physical, chemical and biological processes.Simultaneously there has been a rapid development of a broad array of experimental tools for working with THz radiation. With the advent of modem micro-fabrication and MEMS technologies, the operating frequencies of vacuum electron microwave devices are being extended into the THz regions. One example, a 1 THz Backward WaveOscillator (BWO) is commercially available'. However, state-of-the-art THz BWOs are inefficient (<0.001%) and very heavy (>350kg, including required magnets and power supplies), making them impractical for widespread applications.Extending microwave sources into the sub-mm wave region, combined with the need for miniaturization, poses a variety of very serious challenges for electron cathode performance, as well as for electron beam transport, quality and focusing. Extending the frequency to the THz range requires confining the electron beam to an increasingly small cross section. In fact, since the required beam current density is proportional to the operating frequency squared 2 , the challenge is to generate and rea...

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“…Most of the experimental and theoretical efforts in the last decade were directed toward X-band operation [1]- [3], [5], [24], [25], [30]- [35]; however, the demand for high gradients at higher and higher frequencies for the next linear collider (NLC) pushes the operating frequency toward the Ka-band (e.g., 35 GHz), and as a result, this study focuses on this frequency regime [36]- [38]. The same trend is also motivated by a military need to deposit a large amount of energy in a relatively small area far away from the source-obviously, this ability is improved at higher frequencies.…”

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confidence: 99%

“…Even if this was possible, the problem of the magnetic field's necessity to guide the beam and the latter's expansion in the interaction process still remains [38]. In order to have some feeling regarding the implications of these constraints, consider an X-band structure (say, 35/ 3 11.66 GHz) that may have a typical internal radius of 7 mm when driven by a beam of 3-mm radius. Requiring equal power levels carried by the beam for a system operating at Ka-band (35 GHz) and adopting the frequency scaling, which entails a beam of 1-mm radius, the necessary compression ratio should be increased by nine.…”

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confidence: 99%

The interaction of symmetric and asymmetric modes in a high-power traveling-wave amplifier

Banna

Nation

Schächter

et al. 2000

IEEE Trans. Plasma Sci.

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A three-dimensional (3-D) model has been developed for the investigation of the coupling of the lowest symmetric and asymmetric modes in a high-power, high-efficiency traveling-wave amplifier. We show that in a uniform structure and for an initially nonbunched beam, the interaction efficiency of the asymmetric mode may be much higher than that of the symmetric mode. It is also shown that the coupling between these two modes is determined by a single parameter that depends on the beam characteristics; its value varies between zero when no coupling exists and unity in case of maximum coupling. For a beam that is uniform at the input end, this parameter varies linearly with the guiding magnetic field. In case of a bunched beam, it decreases linearly with the increasing phase-spread of the bunch. Because of the interaction, the radius of the beam increases linearly with the power associated with the asymmetric mode at the input end; it increases rapidly in the case of an initially uniform beam relative to the case of a prebunched beam. Selective damping to suppress the asymmetric mode is described and analyzed.

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High power W-band klystrons

Cited by 5 publications

References 0 publications

10-MW, W-band RF source for advanced accelerator research

10-MW, W-band RF source for advanced accelerator research

Miniature Electron Sources for Tomorrow's Vacuum THz Devices (MiPRI)

The interaction of symmetric and asymmetric modes in a high-power traveling-wave amplifier

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