Computational Tools for Optimized Design of Advanced Traveling Wave Tubes
Final rept. 1 Sep 2000-1 Mar 2003, Phase 2
ANALEX CORP BROOK PARK OH
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Research and development of optimized vacuum electronic sources utilizing advanced computational codes and state-of-the-art micro- fabrication techniques were performed focusing on using micromachining to develop THz regime folded-waveguide traveling-wave tubes TWTs. Successful development of THz TWTs has enormous potential for low-cost, extremely-high-data-rate 10 GBs advanced digital communications capabilities, as well as lower cost, higher yield production of millimeter-wave slow-wave amplifiers for air-borne radar and missile seeker technologies. To address the need for compact THz radiation sources amplifiers and oscillators, micro-fabricated TWTs were invented under this program and feasibility analyses were completed resulting in representative designs for a 56 mW, 560 GHz recirculated feedback oscillator and a 174 mW, 400 GHz amplifier. The recirculated feedback oscillator concept was successfully demonstrated experimentally at a scaled frequency, and in depth studies have been completed to investigate several parameters including return path attenuation, spectral evolution, small-signal gain, drive characteristics, and phase sensitivity. The first accurate, physics based, particle-in-cell model has been established to represent the recirculated feedback oscillator, and shows good agreement with experimental results. Three complementary microfabrication methods have been explored and compared for eventual commercial feasibility. The methods include x ray LIGA, UV LIGA, and DRIE. A fourth method, polymer micromolding, has been identified that shows promise as well, possibly best suited for lower frequencies.
- Electrical and Electronic Equipment