Methods of calculating selected geometrical effects in the design of ICRH antennas
| Autor: | J.H. Whealton, K.E. Rothe, P.M. Ryan, D.J. Hoffman, F.W. Baity, Richard Goulding, G. R. Haste |
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| Rok vydání: | 1994 |
| Předmět: |
Physics
Directional antenna Coaxial antenna Loop antenna Mechanical Engineering Acoustics Antenna measurement Antenna factor Antenna efficiency law.invention Nuclear magnetic resonance Nuclear Energy and Engineering law General Materials Science Dipole antenna Antenna (radio) Civil and Structural Engineering |
| Zdroj: | Fusion Engineering and Design. 24:135-157 |
| ISSN: | 0920-3796 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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