Folded waveguide traveling-wave tube sources for Terahertz radiation

被引:221
作者
Bhattacharjee, S [1 ]
Booske, JH
Kory, CL
van der Weide, DW
Limbach, S
Gallagher, S
Welter, JD
Lopez, MR
Gilgenbach, RM
Ives, RL
Read, ME
Divan, R
Mancini, DC
机构
[1] Univ Wisconsin, Dept Elect & Comp Engn, Madison, WI 53706 USA
[2] NASA, Glenn Res Ctr, Analex Corp, Cleveland, OH 44135 USA
[3] Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48105 USA
[4] Calabazas Creek Res Inc, Saratoga, CA 95070 USA
[5] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
关键词
delayed feedback oscillator; folded waveguide (FWG) traveling-wave tube (TWT); frequency spectrum; high power; microfabrication; phase; Terahertz radiation; wide-band;
D O I
10.1109/TPS.2004.828886
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Microfabricated folded waveguide traveling-wave tubes (TWTs) are potential compact sources of wide-band, high-power terahertz radiation. We present feasibility studies of an oscillator concept using an amplifier with delayed feedback. Simulations of a 560-GHz oscillator and experimental evaluation of the concept at 50 GHz are presented. Additionally, results from various fabrication methods that are under investigation, such as X-ray lithography, electroforming, and molding (LIGA), UV LIGA, and deep reactive ion etching are presented. Observations and measurements are reported on the generation of stable single-frequency oscillation states. On varying the feedback level the oscillation changes from a stable single-frequency state at the threshold to multifrequency spectra in the overdriven state. Simulation and experimental results on amplifier characterization and dynamics of the regenerative TWT oscillator include spectral evolution and phase stability of the generated frequencies. The results of the experiment are in good agreement with the simulations.
引用
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页码:1002 / 1014
页数:13
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