Fast wave at 433 MHz on FTU by a folded waveguide launcher
The use of fast wave (FW) power to interact directly with electrons is a useful tool for central heating of high density, high temperature plasmas and for electron current drive (CD). Direct electron heating by FW has been observed on JET and TFTR and, although FW absorption is weak at low beta, successful electron heating and CD have been achieved on DIII-D at T(e) = 2.3 keV. The folded waveguide (FWG) is a promising new concept for ICRF launchers having the advantage of compact, rigid structure and very low impedence at the plasma edge. It is particularly attractive for FTU since loop antennae suffer efficiency degradation at high frequency due to poloidal current decrease, whereas the RF flux coupled by a FWG is more poloidally uniform. This paper considers the possibility of injecting around 1 MW of FW at 433 MHz into the FTU-tokamak, using the FWG as a launcher.
Bibliographic Reference: Paper presented: 20th EPS Conference on Controlled Fusion and Plasma Physics, Lisboa (PT), July 26-30, 1993
Availability: Available from (1) as Paper EN 37547 ORA
Record Number: 199310875 / Last updated on: 1994-11-29
Original language: en
Available languages: en