Gyrotron and ubitron amplifier research at the Naval Research Laboratory

Freund, H. P.; Ganguly, A. K.; Parker, Robert K.; Vanderplaats, N.R.; Ahn, Sang Chul; Park, S. Y.; Arfin, B.; Bollen, W.M.; Jackson, R.H.

doi:10.1080/00207218408938990

Cited by 3 publications

(1 citation statement)

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“…A 28 GHz gyro-klystron employing three cavities and operating in the TE o2 mode has produced 50 kW with 8% efficiency (lory et al 1977). Very recently, a group at the Naval Research Laboratory (Freund et al 1984, Bollen et al 1984 has put into operation a 5 GHz three-cavity gyro-klystron operating in the fundamental mode of rectangular waveguide; initial results include output power of 45 kW with 28% efficiency (orbital efficiency~50%); large-signal gain was 24 dB. Efficiency was optimized in this 5 G Hz experiment by careful shaping of the strength of the external magnetic field along the tube axis.…”

Section: Prospects For Developing High Pulsed Power Gyro-klystron Ampmentioning

confidence: 98%

High average power and high peak power gyrotrons: present capabilities and future prospects†

Granatstein

1984

International Journal of Electronics

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We survey work in the U.S.A. High average power gyrotrons (1 MW at 100-150GHz) are required for ECRH of magnetic fusion plasmas. Even though gyrotrons have superior mode stability compared with other tubes, they must be so grossly overmoded to handle 1 MW CW that mode control does become an issue. Studies of gyrotron-oscillator cavity designs with enhanced mode stability properties are described, including complex and Fabry-Perot cavities. In the complex cavity concept, two cavities each operating in a different mode are strongly coupled. Exploitation of this concept in a 60 G Hz TED I/TE 0 1 gyrotron has already resulted in power greater than 200kW CWo Designs of TE 0 3jTE 0 4 and TE 0 3/TE 0 6 gyrotrons which promise to extend performance are discussed. A 115GHz gyrotron using a Fabry-Perot cavity has been successfully demonstrated at power levels above 50 kW and prospects of extending performance are considered. Study of high peak power gyrotrons is stimulated by the perceived requirement for 300 MW RF sources at i. -3 cm to drive very high energy (I TeV) linear electron accelerators. For this application, the phase of the microwave signal must be precisely controllable. These demanding requirements have led to renewed interest in gyro-klystron amplifiers, and studies of relatively low power gyro-klystrons will be reviewed. Finally, a design of a 300 MW gyro-klystron is presented.

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Section: Prospects For Developing High Pulsed Power Gyro-klystron Ampmentioning

confidence: 98%