Beam-Wave Research, Inc.

Bethesda, MD, United States

Beam-Wave Research, Inc.

Bethesda, MD, United States
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Cook A.M.,U.S. Navy | Joye C.D.,U.S. Navy | Kimura T.,Communications and Power Industries Inc | Wright E.L.,Beam-Wave Research, Inc. | Calame J.P.,U.S. Navy
IEEE Transactions on Electron Devices | Year: 2013

We present electromagnetic cold-test measurements of BeO ceramic pillbox vacuum windows for a 220-GHz traveling-wave tube amplifier. Transmission and reflection measurements show better than 20 dB return loss over a 25 GHz bandwidth, with band centers in the range of 212-225 GHz. We observe tuning of the window response as the circular waveguide length is changed. High-power testing is performed at 2.5 W, 100% duty at 218 GHz. © 1963-2012 IEEE.


Larsen P.B.,Research Laboratory | Larsen P.B.,University of Maryland University College | Abe D.K.,U.S. Navy | Cooke S.J.,U.S. Navy | And 3 more authors.
IEEE Transactions on Plasma Science | Year: 2010

This paper investigates the properties of a threeslot doubly periodic staggered-ladder sheet-beam coupled-cavity slow-wave structure (SWS) developed at the U.S. Naval Research Laboratory. The structure is overmoded with complicated mode crossings and field structures. The staggered-ladder structure is compared to round-beam structures via full-wave electromagnetic simulations and experimental measurements. We explore the application of this SWS in a traveling-wave tube amplifier. © 2010 IEEE.


Chernin D.,Leidos Inc. | Antonsen Jr. T.M.,Leidos Inc. | Vlasov A.N.,U.S. Navy | Chernyavskiy I.A.,U.S. Navy | And 2 more authors.
IEEE Transactions on Electron Devices | Year: 2014

A recently published hybrid circuit model for folded-waveguide slow wave structures has been implemented in the 1-D large signal code CHRISTINE. The resulting code is applied to a design for a G-band (220 GHz) folded-waveguide traveling wave tube. Results of small and large signal gain are compared with those from TESLA, a 2-D code using the same circuit model. Conditions for accuracy of the 1-D model are illustrated and explained. The effects of an offset beam tunnel on circuit dispersion and amplifier stability are illustrated using the CHRISTINE code. © 1963-2012 IEEE.


Joye C.D.,U.S. Navy | Cook A.M.,U.S. Navy | Calame J.P.,U.S. Navy | Abe D.K.,U.S. Navy | And 4 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

We present the microfabrication and cold test measurement results of serpentine waveguide amplifier circuits at 220 GHz. The circuits were fabricated using a novel embedded polymer monofilament technique combined with Ultraviolet- LIGA to simultaneously create both the beam tunnel and interaction circuits. We find remarkable characteristic matches between the measurements of the best circuits, illustrating that the process developed is able to create repeatable, highly precise circuits with high yield. It was found that slight beam tunnel misalignment can cause very strong stopbands to appear in the operating band due to bi- or quasi-periodicity. The NRL code TESLA-SW/FW has been used to rapidly simulate the as-built structure under a variety of conditions to accurately predict the performance with an electron beam. The tolerances needed on beam tunnel alignment are studied, with implications extending to the THz range. © 2013 Copyright SPIE.


Gold S.H.,U.S. Navy | Ting A.,U.S. Navy | Jabotinski V.,Beam-Wave Research, Inc. | Zhou B.,Research Support Instruments, Inc. | Sprangle P.,U.S. Navy
Physical Review Special Topics - Accelerators and Beams | Year: 2013

Thermionic electron guns are capable of operating at high average currents in a variety of vacuum electronic applications, including conventional microwave tubes, but have been replaced by laser photocathode injectors for most applications requiring high-brightness electron beams. However, while laser photocathode guns are capable of providing the very high-brightness beams, they provide an increased level of system complexity and do not extrapolate well to injectors for high average current applications requiring high beam quality. We are developing a 714 MHz injector based on a gridded thermionic electron gun for these applications. This paper presents an experimental study, computer simulations, and analysis of the performance of an existing gridded thermionic electron gun as an injector prototype, and a design concept for an improved injector configuration based on these results.


Joye C.D.,U.S. Navy | Calame J.P.,U.S. Navy | Nguyen K.T.,Beam-Wave Research, Inc. | Garven M.,SAIC
Journal of Micromechanics and Microengineering | Year: 2012

Vacuum electron devices require electron beams to be transported through hollow channels that pass through an electromagnetic slow-wave circuit. These electron 'beam tunnels' are shrinking toward sizes smaller than traditional techniques can manage as the operating frequencies push toward the THz. A novel technique is described and experimentally demonstrated that uses polymer monofilaments of arbitrary cross-sectional shape combined with ultraviolet photolithography (UV-LIGA) of SU-8 photoresists. This combination of monofilaments and SU-8 structures comprises a 3D mold around which copper is electroformed to produce high-quality beam tunnels of arbitrary length and size along with the electromagnetic circuits. True round beam tunnels needed for upper-millimeter wave and THz vacuum electron devices can now be fabricated in a single UV-LIGA step. These techniques are also relevant to microfluidic devices and other applications requiring very small, straight channels with aspect ratios of several hundred or more. © 2012 IOP Publishing Ltd.


Yater J.E.,SAIC | Shaw J.L.,SAIC | Jensen K.L.,SAIC | Feygelson T.,SAIC | And 3 more authors.
Diamond and Related Materials | Year: 2011

The current amplification characteristics of an unbiased 8.3-μm-thick single-crystal CVD diamond film are examined using secondary-electron-emission measurements. In particular, the intensity and energy distribution of transmitted and reflected secondary electrons are measured and used to examine the transport and emission properties that govern the current amplification process. Overall, the measurements confirm the excellent transport and emission properties of single-crystal CVD diamond, as compared to polycrystalline CVD diamond films studied previously. Specifically, the transmitted and reflected energy distributions measured from the single-crystal diamond are nearly identical, with a sharp, narrow (FWHM = 0.35 eV) emission peak dominating the spectra. However, the transmitted distributions are more fully thermalized as a result of the longer transport distances. In fact, transmitted electrons are detected even after traveling more than 8 μm through the film, which demonstrates the potential for excellent transport efficiency. Maximum transmission gains of 3-4 are obtained, which is encouraging under such field-free conditions. However, the results of the study indicate that the transmission process is being limited by diffusive transport in the unbiased diamond film.


Grant
Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase I | Award Amount: 79.98K | Year: 2015

The technical objectives of the proposed Phase I program are: to evaluate and design a multiple-beam electron gun capable of generating approximately 1 A of beam current at a low voltage of 5-7 kV suitable for use in a broadband Ka-band amplifier, to perform beam-wave interaction studies to ensure the resulting beam-forming/circuit design will generate RF output powers in excess of 500 W over a minimum of 5-GHz bandwidth, to optimize the beam transport system to minimize size and weight with the goal toward 0.5 kW/kg, and to develop a preliminary mechanical layout from which an engineering plan can be generated and implemented in Phase II.


Grant
Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase II | Award Amount: 730.41K | Year: 2014

BWRI proposes the full scale development (fabricate, assemble, and test) of a three-beam electron gun for used in future advanced millimeter-wave amplifiers in the proposed Phase-II program. Under the Phase-I base program, a baseline design study establishing the gun feasibility was completed. Results indicate the proposed gun can generate 3 x 0.55 A electron beams at 20 kV for a total of 33 kW of beam power. Beam transport was also studied as an integral part of the Phase-I program to ensure that the individual beamlets can be transported through the small beam tunnels required for efficient beam-wave interactions in Ka-band for a variety of magnetic field configurations. In addition, the beam optics from the electron gun and transport system were used to investigate beam-wave interactions with our novel three-beam cascaded serpentine traveling-wave tube. Simulations results indicated that this electron gun will enable a new generation of amplifiers capable of 4.2 kW of peak power over a 3-dB bandwidth of 9.5 GHz, spanning the important 32.5 42 GHz frequency range


Grant
Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase I | Award Amount: 149.55K | Year: 2012

The proposed program is for the design of a multiple-beam electron gun and beam transport system suitable for integration with a novel amplifier capable of generating more than 2 kW of output power over a very broad bandwidth. As part of the proposed effort, beam phasespace from gun design will be imported into large signal codes and/or PIC codes to optimize beam-wave interaction. Amplifier size and weight will also be optimized as an integral part of the proposed work. Based on the design study, a mechanical layout of the beamstick will be prepared for evaluation for evaluation by Government personnelat the end of the program .

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