Polarization Issues with High Power Injection and Low Power Emission in Fusion Experiments

Journal Article · Thu Nov 26 04:00:00 EST 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3273811· OSTI ID:21335787

Goodman, T P; Felici, F; Udintsev, V S ^[1]

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1. Ecole Polytechnique Federate de Lausanne (EPFL), Centre de Recherches en Physique des plasmas, Association EURATOM-Confederation Suisse, CH-1015 Lausanne (Switzerland)

All tokamak experiments using ECCD require setting of the beam elliptical polarization for proper coupling to the plasma. This is done either in the matching optics unit (MOU) at the output of the gyrotron, or in a couple of miter bends of the transmission line. Similarly, oblique ECE receivers require selection of the correct elliptical polarization to provide localized measurements. For the TCV tokamak at the CRPP, gyrotron and oblique-ECE polarizers are characterized during either high- or low- power testing of equipment: for the gyrotrons the behaviour is determined at a single frequency, but for the oblique-ECE the broadband response is needed. These characteristics are included in the calibration database and used during subsequent analysis of the power coupling to, or from, the sources (gyrotron, plasma, or low power transmitting antenna). A more detailed characterization has been carried out (at low power) with the MOU for the EU, 170 GHz, 2 MW, gyrotron prototype for ITER. This paper discusses the methodology and results of these measurements, as well as a review of nearly a decade's worth of experimental data from the 6 gyrotron, 3 MW, 82.6 GHz TCV system. In particular, the consistency between the calibrations and the subsequent data from tokamak experiments is analysed.

• OSTI ID: 21335787
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1187; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANTENNAS
CALIBRATION
COUPLING
ECR CURRENT DRIVE
ECR HEATING
GHZ RANGE
ITER TOKAMAK
MICROWAVE AMPLIFIERS
OPTICS
PLASMA
PLASMA HEATING
PLASMA WAVES
POLARIZATION
POWER TRANSMISSION
TCV TOKAMAK