Abstract
An in-situ alignment system for beam waveguides based on an interferometric direction-finding antenna was investigated numerically and experimentally. The system consists of a reflector with four off-central positioned waveguide couplers in two directions. By nulling the difference of the power signals as well as the mixing signal from each coupler pair, spatial and angular alignments of a beam impinging on the mirror can be performed. In this paper, the characteristics of such a mirror are presented, and the design of a prototype intended for use in an ECH transmission line at LHD is described. Low-power as well as high-power tests at a frequency of 82.7 GHz were carried out, and the results are discussed. The device shows a high performance in agreement with theory.
| Original language | English |
|---|---|
| Pages (from-to) | 451-472 |
| Number of pages | 22 |
| Journal | International Journal of Infrared and Millimeter Waves |
| Volume | 24 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Apr 2003 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Radiation
- Atomic and Molecular Physics, and Optics
- Instrumentation
- Condensed Matter Physics
- Physics and Astronomy (miscellaneous)
- Electrical and Electronic Engineering