Radially scanned probe measurements in front of the CASTOR lower hybrid antenna
✍ Scribed by F. Žáček; V. Petržílka; M. Goniche; P. Devynck; S. Nanobashvili
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 632 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0005-8025
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✦ Synopsis
Abstract
Lower hybrid waves (LHW) are used for non‐inductive generation of the electrical current in many tokamaks. However, in addition to the current drive, a parasitic acceleration of particles in front of the antennas takes place if the power is high enough. The small tokamak CASTOR allows to carry out measurements directly in the waves‐plasma interaction region, using movable Langmuir probes. This paper investigates fluctuations of the plasma parameters and electrical fields in the radially narrow layer in front of the CASTOR antenna, where a significant drop of floating potential has been observed recently [1]. Significant changes in these quantities have been found during LHW discharge phase. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)