Abstract
A CW capable inline electron cyclotron emission (ECE) separation system for feedback control, featuring oversized corrugated waveguides, is commissioned on ASDEX upgrade (AUG). The system is based on a combination of a polarization independent, non-resonant, Mach-Zehnder diplexer equipped with dielectric plate beam splitters [2, 3] employed as corrugated oversized waveguide filter, and a resonant Fast Directional Switch, FADIS [4, 5, 6, 7] as ECE/ECCD separation system. This paper presents an overview of the system, the low power characterisation tests and first high power commissioning on AUG. © Owned by the authors, published by EDP Sciences, 2012.
Highlights
For high performance tokamak plasmas, neoclassical tearing modes (NTMs) and sawteeth instabilities need to be controlled by locally applied Electron Cyclotron Current Drive (ECCD)
The system is based on a combination of a polarization independent, non-resonant, Mach-Zehnder diplexer equipped with dielectric plate beam splitters [2, 3] employed as corrugated oversized waveguide filter, and a resonant Fast Directional Switch, fast directional switch (FADIS) [4, 5, 6, 7] as electron cyclotron emission (ECE)/ECCD separation system
This paper presents an overview of the system, the low power characterisation tests and first high power commissioning on ASDEX upgrade (AUG)
Summary
For high performance tokamak plasmas, neoclassical tearing modes (NTMs) and sawteeth instabilities need to be controlled by locally applied Electron Cyclotron Current Drive (ECCD). Measuring electron temperature using Electron Cyclotron Emission (ECE) along the line of sight of ECCD offers the advantage that temperature fluctuations, resulting from NTMs and sawteeth, are measured relative to the deposition position. Such a system, in which ECE is measured in the EC transmission line, provides signals for feedback control without making any assumptions on the plasma equilibrium. An inline ECE system was demonstrated to be effective on TEXTOR in a quasi-optical configuration [1]
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