Elevation angle alignment of quasi optical receiver mirrors of collective Thomson scattering diagnostic by sawtooth measurements
Journal article, 2012
Localized measurements of the fast ion velocity distribution function and the plasma composition measurements are of significant interest for the fusion community. Collective Thomson scattering (CTS) diagnostics allow such measurements with spatial and temporal resolution. Localized measurements require a good alignment of the optical path in the transmission line. Monitoring the alignment during the experiment greatly benefits the confidence in the CTS measurements. An in situ technique for the assessment of the elevation angle alignment of the receiver is developed. Using the CTS diagnostic on TEXTOR without a source of probing radiation in discharges with sawtooth oscillations, an elevation angle misalignment of 0.9 degrees was found with an accuracy of 0.25 degrees.
radiation
ion temperature
Author
D. Moseev
Foundation for Fundamental Research on Matter
Max Planck Society
F. Meo
Technical University of Denmark (DTU)
S. B. Korsholm
Technical University of Denmark (DTU)
H. Bindslev
Aarhus University
Vedran Furtula
Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics
M. Kantor
Forschungszentrum Jülich
Russian Academy of Sciences
Foundation for Fundamental Research on Matter
F. Leipold
Technical University of Denmark (DTU)
P. K. Michelsen
Technical University of Denmark (DTU)
S. K. Nielsen
Technical University of Denmark (DTU)
M. Salewski
Technical University of Denmark (DTU)
M. Stejner
Technical University of Denmark (DTU)
Review of Scientific Instruments
0034-6748 (ISSN) 1089-7623 (eISSN)
Vol. 83 10 10E337Subject Categories
Physical Sciences
DOI
10.1063/1.4737387