Two frequency ICRF heating of D-T plasmas on TFTR

Author

Rogers, J.H. ; Majeski, R. ; Wilson, J.R. ; Hosea, J.C. ; Schilling, G. ; Stevens, J. ; Ho, Y.L. ; Raman, S. ; Rasmussen, D.A.

Author_Institution

Plasma Phys. Lab., Princeton Univ., NJ, USA

Volume

2

fYear

1993

fDate

11-15 Oct 1993

Firstpage

621

Abstract

Modifications have been made to allow two of the ICRF antennas (bays L and M) on TFTR to operate at either of two frequencies, 43 MHz or 64 MHz. This was accomplished by lengthening the resonant loops feeding the antennas (2λ at 43 MHz, 3λ at 64 MHz) and replacing the conventional quarter wave impedance transformers with a tapered impedance design. The other two antennas (bays K and N) will operate at a fixed frequency, 43 MHz. The two frequency operation allows a combination of ³He-minority (or T second harmonic) and H-minority heating at full toroidal field on TFTR. Multiple frequency operation may also be useful in direct electron heating and current drive experiments. Other modifications have been made which are expected to permit arbitrary phasing between the current straps on bays M and L. The system design of the antenna, resonant loops and impedance matching system as well as preliminary TFTR results are discussed

Keywords

Tokamak devices; antennas; fusion reactor design; fusion reactors; impedance convertors; impedance matching; plasma radiofrequency heating; 43 MHz; 64 MHz; ³He-minority heating; D-T plasmas; H-minority heating; ICRF antennas; T second harmonic heating; TFTR; arbitrary phasing; current drive experiments; current straps; direct electron heating; full toroidal field; impedance matching system; multiple frequency operation; quarter wave impedance transformers; resonant loops; tapered impedance design; two frequency ICRF heating; Electrons; Frequency; Heating; Impedance; Laboratories; Magnetic confinement; Plasma applications; Power system harmonics; Power transmission lines; Resonance;

fLanguage

English

Publisher

ieee

Conference_Titel

Fusion Engineering, 1993., 15th IEEE/NPSS Symposium on

Conference_Location

Hyannis, MA

Print_ISBN

0-7803-1412-3

Type

conf

DOI

10.1109/FUSION.1993.518407

Filename

518407