The ratio frequency characteristics of the combline antenna
Creators
- 1. Nagoya Univ., Nagoya, Aichi (Japan)
- 2. National Inst. for Fusion Science, Toki, Gifu (Japan)
- 3. Tokyo Univ., Tokyo (Japan)
Description
A combline antenna was designed and fabricated to improve the plasma performance of the LHD. It has a capability to drive plasma current and to heat the plasma by ICRF heating. The LHD combline antenna consists of ten antenna elements. The two elements of those are an input and an output antenna element. Equations were derived to examine the RF characteristics. The currents at the Nth antenna element and 1st antenna element were formulated in a 4x4 matrix using the RF current at the RF power supply. A traveling wave was found to be excited at the frequency range as referred to a pass-band. The phase velocity of the traveling wave can be controlled by changing an applied frequency as one of several features of the combline antenna. The width of the pass-band is a function of the value of the plasma loading resistance, the distance between antenna elements, how to feed the RF power and a configuration of the Faraday shields, etc. A T-shaped antenna strap was employed at the present design of the combline antenna, which results in a mixture of the even mode and the odd mode. However the undesirable odd mode can be eliminated by selecting the frequency. (author)
Additional details
Publishing Information
- Publisher
- Japan Society of Plasma Science and Nuclear Fusion Research
- Imprint Place
- Nagoya, Aichi (Japan)
- ISBN
- 4-9900586-7-4
- Imprint Title
- Proceedings of joint conference of ITC-12 and APFA'01: Frontiers in plasma confinement and related engineering/plasma science
- Imprint Pagination
- 650 p.
- Journal Page Range
- p. 314-317
Conference
- Title
- 12. international Toki conference on plasma physics and controlled nuclear fusion; APFA'01: 3. general scientific assembly of Asia plasma and fusion association
- Acronym
- ITC-12
- Dates
- 11-14 Dec 2001
- Place
- Toki, Gifu (Japan)
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 34068669
- Subject category
- S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- ANTENNAS; COMPUTER-AIDED DESIGN; EQUIVALENT CIRCUITS; HELICAL CONFIGURATION; ICR HEATING; LHD DEVICE; RADIO EQUIPMENT; RF SYSTEMS
- Descriptors DEC
- CLOSED PLASMA DEVICES; CONFIGURATION; DESIGN; ELECTRICAL EQUIPMENT; ELECTRONIC CIRCUITS; ELECTRONIC EQUIPMENT; EQUIPMENT; HEATING; HIGH-FREQUENCY HEATING; PLASMA HEATING; THERMONUCLEAR DEVICES
Optional Information
- Notes
- 3 refs., 5 figs. Imprint:Published in Journal of Plasma and Fusion Research SERIES, Volume 5