In a tokamak, magnetic islands need to be suppressed. Suppression is possible with electron cyclotron heating (ECH), which can be positioned using electron cyclotron emission (ECE) temperature measurements. A set-up to detect ECE in the line of sight of ECH has been built for the TEXTOR tokamak and the ASDEX Upgrade tokamak. In TEXTOR, a dielectric filter was used to separate low power ECE from high power ECH and successful aiming of ECH and suppression of a magnetic island could be demonstrated. At ASDEX Upgrade, a fast directional switch (FADIS) was used to separate ECE from ECH. Measurements of magnetic islands at ASDEX Upgrade are presented. The applicability of these measurements for magnetic island detection is discussed.
|Number of pages||10|
|Journal||Proceedings of Science|
|Publication status||Published - 1 Jan 2015|
|Event||1st EPS Conference on Plasma Diagnostics, ECPD 2015 - Frascati, Italy|
Duration: 14 Apr 2015 → 17 Apr 2015