Linearized spectrum correlation analysis for thermal helium beam diagnostics

T. Nishizawa, M. Griener, R. Dux, G. Grenfell, D. Wendler, S. Kado, P. Manz, M. Cavedon

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We introduce a new correlation analysis technique for thermal helium beam (THB) diagnostics. Instead of directly evaluating line ratios from fluctuating time series, we apply arithmetic operations to all available He I lines and construct time series with desired dependencies on the plasma parameters. By cross-correlating those quantities and by evaluating ensemble averages, uncorrelated noise contributions can be removed. Through the synthetic data analysis, we demonstrate that the proposed analysis technique is capable of providing the power spectral densities of meaningful plasma parameters, such as the electron density and the electron temperature, even under low-photon-count conditions. In addition, we have applied this analysis technique to the experimental THB data obtained at the ASDEX Upgrade tokamak and successfully resolved the electron density and temperature fluctuations up to 90 kHz in a reactor relevant high power scenario.

Original languageEnglish
Article number103501
JournalReview of Scientific Instruments
Issue number10
Publication statusPublished - Oct 1 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Instrumentation


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