Installation and Initial Testing of the Electric Tokamak Folded Waveguide
Abstract
A 57MHz folded waveguide (FWG) has been installed on the UCLA Electric Tokamak (ET). The FWG has a 28.9cm square cross section and can be rotated for operation as either a fast wave or Ion Bernstein wave launcher. Two sets of planar faceplates allow for either a monopole launch spectrum or dipole (0-pi) phasing. The FWG can provide high power density with low electric fields at the launch end as compared to conventional loop antennas. The FWG has the potential to become an important part of RF heating experiments on ET intended to investigate current profile control for high beta applications. Initial low-field-side coupling tests were performed with the FWG mounted above the horizontal midplane outside a polypropylene vacuum window with a 4.6cm gap between the monopole faceplate and the inside of the window. Network analyzer measurements during plasma operations indicated sufficient loading in this configuration to justify proceeding with flange modifications to allow vacuum operations with the FWG mounted on the horizontal midplane. Installation of the antenna directly on the tokamak is underway. A 30-60 MHz, 20kW transmitter will be utilized for modest power operations.
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- October 2001
- Bibcode:
- 2001APS..DPPCP1013B