A high-power 95 GHz gyro-TWT amplifier
The need for radar systems with greater resolution has led to renewed interest in the development of efficient high-power amplifiers at 95 GHz. The gyro-TWT is capable of producing high power with the added attraction of having lower ohmic loading on the smooth fast-wave interaction circuit than conventional slow-wave sources. We have completed a comprehensive desip of a 95 GHz gyro-TWT amplifier that is capable of producing 120 kill of output power with an efficiency of 30%, a saturated gain of 38 dB and an instantaneous bandwidth of over 5 GHz. Our concept uses an annular beam produced by a MIG electron source and operates in the TE{sub 5,1} cylindrical waveguide mode. Realistic beam parameters from gun simulations were, included in our efficiency calculations. In addition, our design includes the use of a compact superconducting magnet, quasi-optical input and output couplers and a sever to supress oscillations. The overall mechanical design shows that a compact, lightweight amplifier with adequate beam clearance is possible. This report also includes a study of a gyro-TWT using a solid on-axis beam from a Pierce-wiggler electron source coupling with a TE{sub 1,n} waveguide mode. Nonlinear models indicated that an efficient interaction with the waveguide mode was possible, however, beam simulations indicated that the high current density beam had large internal space charge forces that caused a substantial degradation of the beam quality.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge, MA (United States). Plasma Fusion Center
- Sponsoring Organization:
- Department of Defense, Washington, DC (United States)
- DOE Contract Number:
- AC02-78ET51013
- OSTI ID:
- 10191850
- Report Number(s):
- PFC/RR--92-11; ON: DE93002332
- Country of Publication:
- United States
- Language:
- English
Similar Records
Gyro-TWT amplifier development at UCD: (1) 200 kW second-harmonic, (2) wideband and (3) slotted third-harmonic gyro-TWT`s
Stable 1 MW, third-harmonic gyro-TWT amplifier