Commissioning activities and first results from the collective Thomson scattering diagnostic on ASDEX Upgrade (invited)

Journal Article · Wed Oct 15 04:00:00 EDT 2008 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2989140· OSTI ID:21266490

Meo, F; Bindslev, H; Korsholm, S B; Furtula, V; Leipold, F; Michelsen, P K; Nielsen, S K; Salewski, M ^[1]; Leuterer, F; Woskov, P ^[2]; Stober, J; Wagner, D ^[3]

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1. Association EURATOM, Risoe National Laboratory for Sustainable Energy, Technical University of Denmark, DK-4000 Roskilde (Denmark)
2. MIT PSFC, Cambridge, Massachusetts 02139 (United States)
3. Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, D-85748 Garching (Germany)

The collective Thomson scattering (CTS) diagnostic installed on ASDEX Upgrade uses millimeter waves generated by the newly installed 1 MW dual frequency gyrotron as probing radiation at 105 GHz. It measures backscattered radiation with a heterodyne receiver having 50 channels (between 100 and 110 GHz) to resolve the one-dimensional velocity distribution of the confined fast ions. The steerable antennas will allow different scattering geometries to fully explore the anisotropic fast ion distributions at different spatial locations. This paper covers the capabilities and operational limits of the diagnostic. It then describes the commissioning activities carried out to date. These activities include gyrotron studies, transmission line alignment, and beam pattern measurements in the vacuum vessel. Overlap experiments in near perpendicular and near parallel have confirmed the successful alignment of the system. First results in near perpendicular of scattered spectra in a neutral beam injection (NBI) and ion cyclotron resonance heating (ICRH) plasma (minority hydrogen) on ASDEX Upgrade have shown evidence of ICRH heating phase of hydrogen.

• OSTI ID: 21266490
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 79; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANTENNAS
ASDEX TOKAMAK
GHZ RANGE
HETERODYNE RECEIVERS
HYDROGEN
ICR HEATING
IONS
MICROWAVE AMPLIFIERS
THOMSON SCATTERING