Fast Thermal Helium Beam diagnostic for measurements of edge electron profiles and fluctuations

M. Agostini, P. Scarin, R. Cavazzana, L. Carraro, L. Grando, C. Taliercio, L. Franchin, A. Tiso

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Abstract

The edge of fusion experiments is a region where strong gradients develop, together with the presence of strong fluctuations due to turbulence. The thermal helium beam diagnostic developed for the RFX-mod experiment allows the measurements with a single diagnostic of both low frequency time evolution of the edge radial profiles of electron density and temperature (tens of hertz), and the high frequency fluctuations (hundreds of kHz). To maximize the collected light, the three HeI lines necessary to be measured for the evaluation of neand Teare separated with a spectrograph, and multianode photomultipliers are used as light detectors. The paper describes the diagnostic setup, with the interface hardware with the machine and the optical layout, and the characterization of its performances.
Original languageEnglish
Article number123513
Pages (from-to)-
JournalReview of Scientific Instruments
Volume86
Issue number12
DOIs
Publication statusPublished - 1 Dec 2015
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Agostini, M., Scarin, P., Cavazzana, R., Carraro, L., Grando, L., Taliercio, C., Franchin, L., & Tiso, A. (2015). Fast Thermal Helium Beam diagnostic for measurements of edge electron profiles and fluctuations. Review of Scientific Instruments, 86(12), -. [123513]. https://doi.org/10.1063/1.4939003