Demonstration of a 100-kW Solenoidally Focused Sheet Electron Beam for Millimeter-Wave Amplifiers

Pasour, John; Nguyen, Khanh; Wright, E. L.; Balkcum, Adam; Atkinson, John; Cusick, Michael; Levush, B.

doi:10.1109/ted.2011.2126577

Cited by 57 publications

(17 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For stable sheet beam transport in a PM field, the focusing field must balance the natural expansion of the beam due to space charge and emittance (temperature). These conditions are expressed by the envelope equation, which can be written as [6] (3)…”

Section: Sheet Beam Amplifiersmentioning

confidence: 99%

See 1 more Smart Citation

Sheet electron beam millimeter-wave amplifiers at the Naval Research Laboratory

Levush

Abe

Pasour

et al. 2013

2013 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS 2013)

View full text Add to dashboard Cite

To meet the need to transmit increasingly massive volumes of data, both the defense and commercial sectors are turning to higher operational frequencies to take advantage of larger signal bandwidths while concurrently requiring increased amplifier power to achieve the necessary signal-to-noise ratios over large transmission distances. In response to these needs, the last decade has seen a leap in performance of a variety of millimeter-wave devices. The Naval Research Laboratory (NRL) is the principal U.S. Department of Defense R&D center focused on the development of the science and technology behind new millimeterwave high power solid-state and vacuum electronic devices. Selected examples of NRLs research projects are described with an emphasis on high power millimeter-wave vacuum electronic devices.

show abstract

Section: Sheet Beam Amplifiersmentioning

confidence: 99%

“…The EIK employs a Nd-Fe-B permanent magnet that produces a solenoidal field of 8.5 kG, allowing operation at a relatively low voltage of 19-21 kV. This magnet transports the 4 mm × 0.32 mm, 3.5 -4-A beam from the cathode to a depressed collector with >99% efficiency [6].…”

Section: W-band Sheet Beam Eikmentioning

confidence: 99%

Sheet electron beam millimeter-wave amplifiers at the Naval Research Laboratory

Levush

Abe

Pasour

et al. 2013

2013 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS 2013)

View full text Add to dashboard Cite

show abstract

“…The sheet-beam technology [1]- [4] and the multiple-beam technology [5]- [7] provide solutions to this problem. Both of them are capable of increasing the output power of a device by increasing the beam current significantly while keeping the current density and operating voltage at a moderate level.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of a Planar Multiple-Beam Circuit for <inline-formula> <tex-math notation="LaTeX">$W$ </tex-math></inline-formula>-Band High-Power Extended-Interaction Klystron

Lü

Zhang

Wang

et al. 2015

IEEE Trans. Electron Devices

View full text Add to dashboard Cite

Circuit analysis of a multiple-beam version of a high-power extended-interaction klystron is performed. The circuit is based on the barbell cavity with five coplanar electron beams across the transverse section of the cavity. Although the basic circuit design is straightforward, stable operation is challenging due to the mode competition and the self-oscillation in an oversized multiple-gap cavity driven by multiple beam sources. The 3-D particle-in-cell (PIC) simulation technology and the space-charge wave theory were exploited to analyze the stability. The physical design of the interaction system was accomplished with the beam parameters of voltage 19 kV and of overall current 4 A (0.8 A × 5). PIC results show that a power of 11.28 kW can be achieved at a frequency of 94.48 GHz with an instantaneous 3-dB bandwidth of 160 MHz. The corresponding gain and electric efficiency are 55.75 dB and 14.84%, respectively. IndexTerms-Barbell cavity, extended-interaction klystron (EIK), mode competition, particle-in-cell (PIC) simulation, planar multiple beams.

show abstract

“…Various magnetic structures (e.g., closed periodic cusped magnet [9]- [11], wiggler magnets [12], periodic quadruples [13], and staggered closed periodic cusped magnet [14]) have been investigated to provide stable 2-D focusing. Stable transport of sheet beam via high height fill factor and high magnetic field is an alternate focusing technique and edge field error will not an issue in this case [8], [15]- [17]. However, for the SBTWT, the actual cavity height of the vane loaded periodic slow wave structure is the effective tunnel height approximately and high effective height fill factor of the beam is not possible and high magnetic field is the only option.…”

Section: Introductionmentioning

confidence: 99%

Pole-Piece With Stepped Hole for Stable Sheet Electron Beam Transport Under Uniform Magnetic Field

Panda

Srivastava

Vohra

2015

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

An electron gun is designed for a W-band sheet beam TWT using a planar rectangular cathode working in the space charge limited region. A permanent magnet solenoid focusing system is designed to focus the beam. A pole-piece with a novel multisized (stepped) hole is investigated for stable transport of the beam. The size of the hole in the pole-piece is larger near to the magnets and it is gradually decreased stepwise toward the cathode. The pole-piece with the multisized hole reduces both the transverse magnetic field and magnitude of flux leakage toward the cathode. Simulation results show that the sheet beam transports without significant beam ripple and edge curling under the magnetic field of the designed focusing structure with the pole-piece of multisized hole. The thermal velocity of the electrons is also considered in the simulation. The beam transmission up to 70-mm distance is 98.8% and 97.3%, respectively, for nonthermal and thermal beam under the magnetic field of the designed focusing system.Index Terms-Beam transport, brillouin focusing, permanent magnet solenoid, pole-piece, sheet beam traveling-wave tube (SBTWT), sheet-beam electron gun.

show abstract

Demonstration of a 100-kW Solenoidally Focused Sheet Electron Beam for Millimeter-Wave Amplifiers

Cited by 57 publications

References 25 publications

Sheet electron beam millimeter-wave amplifiers at the Naval Research Laboratory

Sheet electron beam millimeter-wave amplifiers at the Naval Research Laboratory

Stability Analysis of a Planar Multiple-Beam Circuit for <inline-formula> <tex-math notation="LaTeX">$W$ </tex-math></inline-formula>-Band High-Power Extended-Interaction Klystron

Pole-Piece With Stepped Hole for Stable Sheet Electron Beam Transport Under Uniform Magnetic Field

Contact Info

Product

Resources

About