Feedback controlled hybrid fast ferrite tuners
- General Atomics, San Diego, CA (United States)
- ANT-Bosch, Backnang (Germany)
A low power ANT-Bosch fast ferrite tuner (FFT) was successfully tested into (1) the lumped circuit equivalent of an antenna strap with dynamic plasma loading, and (2) a plasma loaded antenna strap in DIII-D. When the FFT accessible mismatch range was phase-shifted to encompass the plasma-induced variation in reflection coefficient, the 50 {Omega} source was matched (to within the desired 1.4 : 1 voltage standing wave ratio). The time required to achieve this match (i.e., the response time) was typically a few hundred milliseconds, mostly due to a relatively slow network analyzer-computer system. The response time for the active components of the FFT was 10 to 20 msec, or much faster than the present state-of-the-art for dynamic stub tuners. Future FFT tests are planned, that will utilize the DIII-D computer (capable of submillisecond feedback control), as well as several upgrades to the active control circuit, to produce a FFT feedback control system with a response time approaching 1 msec.
- Research Organization:
- General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-89ER52153
- OSTI ID:
- 10186312
- Report Number(s):
- GA-A-21381; CONF-931018-13; ON: DE94001110; BR: AT101014Z/AT1501024; TRN: 93:024048
- Resource Relation:
- Conference: Symposium on fusion engineering,Hyannis, MA (United States),11-15 Oct 1993; Other Information: PBD: Sep 1993
- Country of Publication:
- United States
- Language:
- English
Similar Records
ICRF antenna matching systems with ferrite tuners for the Alcator C-Mod tokamak
Circuit model of the ITER-like antenna for JET and simulation of its control algorithms