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Beam Optics in High Performance Vacuum Electronic Devices with High Brightness Electron Beams
Navy SBIR 2009.1 - Topic N091-081 ONR - Mrs. Tracy Frost - [email protected] Opens: December 8, 2008 - Closes: January 14, 2009 N091-081 TITLE: Beam Optics in High Performance Vacuum Electronic Devices with High Brightness Electron Beams TECHNOLOGY AREAS: Sensors, Electronics, Weapons ACQUISITION PROGRAM: NAVSEA - FEL The technology within this topic is restricted under the International Traffic in Arms Regulation (ITAR), which controls the export and import of defense-related material and services. Offerors must disclose any proposed use of foreign nationals, their country of origin, and what tasks each would accomplish in the statement of work in accordance with section 3.5.b.(7) of the solicitation. OBJECTIVE: To identify physical processes and develop algorithms pertaining to the modeling of high brightness electron beam generation and transport in vacuum electronic (VE) devices in the upper mm-wave regime (80-300 GHz), including (but not limited to) the effects of velocity and energy spread in the cathode (thermal and cold) emission process, secondary electron generation, and ion formation. The relevant physics based models and successful algorithms will be subsequently integrated with existing physics-based beam optics simulation codes such as MICHELLE [1], enabling significant cost reduction in the mm-wave VE devices development cycle via "first-pass-design success". DESCRIPTION: Broad classes of vacuum electronic devices require higher brightness electron beams to achieve higher output power with enhanced efficiency and high reliability, while mitigating the impact of electron source lifetime degradation, secondary electron generation and the presence of ions (especially for upper mm-wave regime). There are presently no adequate models in beam optics codes to assess these impacts in a predictive manner. The focus of the development is twofold. First, the R&D will concentrate on adapting existing and creating new mathematical models for thermal beam emission, secondary electron creation in the gun region due to electron impacts with a grid or an anode, and ion creation due to the electron beam ionization of the ambient gas in the gun and RF structure regions. Second, to achieve the level of accuracy necessary to achieve "first-pass design success", new algorithms will be developed and implemented in a beam optics code. PHASE I: Develop or select mathematical models and algorithms that will be suitable to the 3D beam optics design of emittance-dominated beams in the presence of secondary electrons and electron-impact-generated ions. PHASE II: Implement and test the Phase I models and algorithms in a stand alone module. Implement numerical facilities that will enable a computationally efficient use of the module in a 3D electron beam optics code. Demonstrate an optimization methodology to minimize the effects of electron velocity spread, secondary electrons, and ions on the beam compression and transport for VE devices in the upper-mm wave regime. PHASE III: It is expected the product will transition to government sponsored programs and their associated contractors PRIVATE SECTOR COMMERCIAL POTENTIAL/DUAL-USE APPLICATIONS: Transition to commercial markets and non-SBIR funded programs through the sale or licensing of the software to private corporations and/or government entities that are in the business of developing high performance products that meet performance requirements, such as lifetime specifications, while minimizing the sensitivity to parameter variations and uncertainties [2]. This may include TWT�s for electronic warfare and high data rate satellite communication. REFERENCES: 2. Dan M. Gobel "Theory of long Term Gain Growth in Traveling Wave Tubes", IEEE Transaction ED , 47, #6, pp. 1286-1292, 2000 KEYWORDS: Vacuum Electronics, TWT, electron emission, electron beam optics
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