NDLI: RF Sources for the ITER Ion Cyclotron Heating and Current Drive System

Content Provider	IEEE Xplore Digital Library
Author	Hosea, J. Brunkhorst, C. Fredd, E. Goulding, R.H. Greenough, N. Kung, C. Rasmussen, D.A. Swain, D.W. Wilson, J.R.
Copyright Year	2005
Description	Author affiliation: Princeton Plasma Phys. Lab., NJ (Hosea, J.; Brunkhorst, C.; Fredd, E.)
Abstract	The RF source requirements for the ITER ion cyclotron (IC) heating and current drive system are very challenging- 20 MW CW power into an antenna load with a VSWR of up to 2 over the frequency range of 35-65 MHz. For the two present antenna designs under consideration, 8 sources providing 2.5 MW each are to be employed. For these sources, the outputs of two final power amplifiers (FPAs), using the high power CPI 4CM2500KG tube, are combined with a 180deg hybrid combiner to easily meet the ITER IC source requirements-2.5 MW is supplied at a VSWR of 2 at ~70% of the maximum tube power available in class B operation. The cylindrical cavity configuration for the FPAs is quite compact so that the 8 combined sources fit into the space allocated at the ITER site with room to spare. The source configuration is described in detail and its projected operating power curves are presented. Although the CPI tube has been shown to be stable under high power operating conditions on many facilities, a test of the combined FPA source arrangement is in preparation using existing high power 30 MHz amplifiers to assure that this configuration can be made robustly stable for all phases at a VSWR up to 2. The possibility of using 12 sources to feed a suitably modified antenna design is also discussed in the context of providing flexibility for specifying the final IC antenna design
Starting Page	1
Ending Page	4
File Size	4187088
Page Count	4
File Format	PDF
ISBN	0424401596
DOI	10.1109/FUSION.2005.252942
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-09-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Cyclotrons Heating High power amplifiers Antenna feeds Radiofrequency integrated circuits Loaded antennas Operational amplifiers Hybrid integrated circuits Testing source ITER ion cyclotron
Content Type	Text
Resource Type	Article

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