Design of a 3-MW 140-GHz gyrotron with a coaxial cavity
- Physical Sciences Inc., Alexandria, VA (United States)
- Massachusetts Inst. of Tech., Cambridge, MA (United States)
Gyrotrons have been developed as sources of high-power millimeter wave radiation for electron cyclotron heating for more than two decades, with orders of magnitude increases in power at frequencies to almost 300 GHz having been achieved. The requirement is for at least 1 MW, essentially CW at 110 GHz, for near-term applications such as plasma heating experiments, and greater than 1 MW CW for the next generation magnetic fusion device, the International Thermonuclear Experimental Reactor (ITER). For increased economy, multimegawatt devices are being considered. In this paper, a design for a 3-MW 140 GHz gyrotron based on the use of a coaxial cavity is given. The cavity mode is TE{sub 21,13}, chosen so that the ohmic heating on both the inner and outer conductors would be low enough for CW operation. The mode selection process, nonlinear, multimode and time-dependent modeling of the beam wave interaction, and gun design are discussed in detail. An inverted magnetron injection gun (MIG) is used to accommodate the inner conductor. The radiation is coupled out via a quasi-optical mode converter, consisting of an irregular cylindrical waveguide section followed by a step-cut launching aperture and a single near-parabolic mirror. The design of these components is also described.
- OSTI ID:
- 377816
- Journal Information:
- IEEE Transactions on Plasma Science, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 3 Vol. 24; ISSN ITPSBD; ISSN 0093-3813
- Country of Publication:
- United States
- Language:
- English
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