Fast ion measurements by collective Thomson scattering in TEXTOR and
ASDEX Upgrade and proposal for the ITER CTS system
S.B. Korsholm, H. Bindslev, V. Furtula, F. Leipold, F. Meo, P. K. Michelsen, D. Moseev, S.K.
Nielsen, M. Salewski, and M. Stejner
Association EURATOM-Risø National Laboratory for Sustainable Energy, Technical
University of Denmark, DK-4000 Roskilde, Denmark
Moving towards the era of burning fusion plasmas, a better knowledge of the physics of
highly energetic particles, such as fusion born alpha particles, becomes essential. Diagnosing
the fast ions in a fusion plasma is a challenging task, but the technique of collective Thomson
scattering (CTS) provides the possibility of revealing the velocity distribution of the confined
fast ions along a given direction – resolved both in time and space. Recently, the ITER
baseline design has been expanded to include the enabling of the front end of a fast ion CTS
diagnostic system resolving dynamics perpendicular to the magnetic field. The feasibility
study and conceptual design of this diagnostic was provided by the CTS group at Risø DTU.
The development of the ITER CTS diagnostic builds on the experiences and expertise gained
from the construction and current operation of the CTS diagnostic systems on TEXTOR and
ASDEX Upgrade.
The talk will briefly introduce the technique of CTS, give an overview of the results of the
current diagnostic systems at TEXTOR and ASDEX Upgrade, and present the chosen
solution and the status of the design of the ITER CTS diagnostic system.