Central mass feedback control using discrete Alfvèn wave spectrum
Frequency backing of a single discrete Alfvèn wave (DAW) during a current flat-top is used to obtain a real-time estimate of the central effective mass. The experimental set up consists of a small double-bar antenna situated on the outer equatorial midplane mounted on a rotating flange, which allows it to be tilted with respect to the magnetic field. This antenna is fed by a 100W amplifier which provides an oscillatory current up to 15Å via a wide band matching circuit, 1-6 MHz range. The plasma response to excitation is detected by an RF pickup coil. The mass control system works well with several target values, providing that the target density can be reached smoothly. Since deuterium and tritium have different effective masses, the diagnostic also offers a way to measure D-T mixtures..
Bibliographic Reference: Paper presented: 16th European Conference on Controlled Fusion and Plasma Physics, Venezia (IT), March 13-17, 1989
Availability: Available from (1) as Paper EN 34438 ORA
Record Number: 198910613 / Last updated on: 1994-12-01
Original language: en
Available languages: en