Abstract
This paper discusses the effects of realistic antenna geometry on the design and performance of ion cyclotron resonance heating (ICRH) antennas and presents methods to calculate these effects and to modify performance predictions that are based on idealized antenna geometry. It emphasizes the engineering aspects of antenna design, such as the electrical characterization of the antenna for inclusion into the power distribution network, as well as detailed analysis of the Faraday shield structure. The analysis of the Faraday shield includes the calculation of the shield's power transmission and dissipation properties (rf load), its effect on the strap phase velocity and characteristic impedance, and the rf heat distribution for the purpose of thermal analysis. The finite antenna length and its interaction with the recessed cavity and reduced phase velocity are presented in terms of an effective antenna length. Calculation of interstrap coupling with slotted septa separating the straps is presented, including a discussion of the basic trade-offs between directionality, loading, and circuit stability in the case of directional phased arrays for fast wave current drive at ICRH frequencies.
| Original language | English |
|---|---|
| Pages (from-to) | 135-157 |
| Number of pages | 23 |
| Journal | Fusion Engineering and Design |
| Volume | 24 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Feb 1994 |
Funding
The design and analysis of antennas for ion cyclotron resonance heating (ICRH) of plasmas is complicated by the nonideal structure of the antenna geometry, the complexity of the plasma response to antenna excitation, and the close mutual coupling between the two. Numerical * Research managed by the Office of Fusion Energy, U.S. Department of Energy, under contract DE-AC05-84OR21400 with Martin Marietta Energy Systems, Inc.