Commissioning and first results of the 174 GHz collective Thomson scattering diagnostic at Wendelstein 7-X

Collective Thomson Scattering (CTS) diagnostics measure the scattering spectrum of monochromatic incident radiation off collective fluctuations in the plasma. In this contribution, we present the first results from the upgraded CTS diagnostic at Wendelstein 7-X (W7-X) operating in the frequency rang...

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Bibliographic Details
Published in:Journal of instrumentation 2024-03, Vol.19 (3), p.C03056
Main Authors: Moseev, D., Ponomarenko, S., Laqua, H.P., Stange, T., Nielsen, S.K., Braune, H., Gantenbein, G., Illy, S., Jelonnek, J., Kasparek, W., Kuleshov, A., Krier, L., Lechte, C., Marsen, S., Nishiura, M., Plaum, B., Ragona, R., Ruess, T., Salewski, M., Stordiau, P., Thumm, M., Wolf, R.C., Zimmermann, J., W7-X Team, the
Format: Article
Language:English
Subjects:
Cyclotrons
Diagnostic systems
Frequency ranges
Incident radiation
Microwave Antennas
Microwave radiometers
Signal to noise ratio
Temporal resolution
Thomson scattering
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Summary:Collective Thomson Scattering (CTS) diagnostics measure the scattering spectrum of monochromatic incident radiation off collective fluctuations in the plasma. In this contribution, we present the first results from the upgraded CTS diagnostic at Wendelstein 7-X (W7-X) operating in the frequency range between 172 and 176 GHz. This frequency range allows for minimization of noise originating from the electron cyclotron emission in the plasma. Consequently, the good signal-to-noise ratio allows measurements of fast ions or bulk plasma parameters with higher temporal resolution compared with the previously used 140 GHz system.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/19/03/C03056