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Bethesda, MD, United States

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. Source

Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase I | Award Amount: 99.96K | Year: 2008

The multiple beam inductive output tube (MB IOT) will play a vital role as a high-power microwave source to drive the accelerator cavities used in future free electron lasers for military systems. There is a great deal that is still unknown about the complex beam wave interaction inherent in conventional IOTs; their development has largely been a cut-and-try endeavor due to a lack of available modeling and simulation tools capable of handling the complexities of this class of vacuum electron device. Issues persist today that limit their performance and reduce manufacturing yield. We propose the development of a suite of self-consistent, physics-based finite element particle in cell codes specifically tailored to address the unique modeling and simulation needs of IOTs and ultimately MB IOTs, in an effort to shed light on the complex nature of their beam-wave interaction, which is the first step on a path to improving performance and yield.

Agency: Department of Defense | Branch: Missile Defense Agency | Program: SBIR | Phase: Phase II | Award Amount: 749.79K | Year: 2006

The proposed program is for the development of a fundamental-mode S-band multiple-beam klystron (MBK) circuit and collector compatible with an eighteen-beam electron gun presently under development. The feasibility of the circuit to operate as a broadband high-power amplifying component when used in conjunction with the eighteen-beam gun (41.6 A at 42 kV) has been conclusively establish under the Phase-I program. Under the Phase-II program, the major objectives are to fabricate and integrate, in collaboration with our industrial partner, the circuit with the gun and collector into a high-average-power compatible MBK and to characterize and demonstrate the full capability and functionality of the MBK as a potential RF sources for advanced radar applications. The program structure and approach to be undertaken in this proposed effort are designed to parallel the same development path for the successful eight-beam MBK, which is the first fundamental-mode MBK developed in the United States and is presently under operation at the Naval Research Laboratory. In addition, we propose to perform a study to investigate the feasibility of utilizing multi-stage depressed collectors in future broadband high-power MBKs. If feasible, such a collector can greatly improve the overall amplifier efficiency and substantial reduce cooling requirement of future multiple-beam amplifiers.

Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase I | Award Amount: 99.88K | Year: 2007

The proposed program is to develop two sheet-beam circuit topologies, one for narrowband and one for broadband, for used in future amplifiers. Several potential micro-fabrication approaches have been identified. Major objectives of the proposed program are to complete detailed circuit designs, to work with identified micro-fabricators to develop a fabrication plan, and to formulate a test plan for evaluating microfabricated circuits in the Phase-II program. Key emphasis is high yield fabrication with affordable unit-cost. Beam transport approaches and thermal analyses will also be performed. The program is designed to establish the fastest possible route to a functional, well characterized circuit ready for integration with the electron gun and collector into a functional amplifier.

Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase II | Award Amount: 745.31K | Year: 2007

The proposed program is to develop a detailed sheet-beam amplifier prototype design, generate all engineering blue prints, fabricate and cold test cavity components to demonstrate circuit design methodology and fabrication concept, develop the electron gun, magnet, and beam transport diagnostics, integrate beam generation and transport components into a functional beam-stick, and perform tests on the fully integrated beam-stick to demonstrate beam generation and stable transport. The overall goal is to resolve all critical circuit manufacturability and beam generation and transport issues and to demonstrate key enabling technologies. The successful demonstration of the work proposed herein will establish the technical foundation for future development of high-power THz sources in a compact, lightweight, and affordable package.

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