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Diagnostic alkali atom (e.g., lithium) beams are routinely used to diagnose magnetically confined plasmas, namely, to measure the plasma electron density profile in the edge and the scrape off layer region. A light splitting optics system was installed into the observation system of the lithium beam emission spectroscopy diagnostic at the Joint European Torus (JET) tokamak, which allows simultaneous measurement of the beam light emission with a spectrometer and a fast avalanche photodiode (APD) camera. The spectrometer measurement allows density profile reconstruction with ∼10 ms time resolution, absolute position calculation from the Doppler shift, spectral background subtraction as well as relative intensity calibration of the channels for each discharge. The APD system is capable of measuring light intensities on the microsecond time scale. However ∼100 μs integration is needed to have an acceptable …
AIP Publishing LLC
Publication date: 
20 Apr 2018

DI Réfy, M Brix, R Gomes, B Tál, S Zoletnik, D Dunai, G Kocsis, S Kálvin, T Szabolics, JET Contributors

Biblio References: 
Volume: 89 Issue: 4 Pages: 043509
Review of Scientific Instruments