Operation of the gas-puff imaging diagnostic in the RFX-mod device
- Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione, Corso Stati Uniti 4, I-35127 Padova, Italy and Dipartimento di Fisica G. Galilei, Universita degli Studi di Padova, via Marzolo 8, I-35100 Padova (Italy)
The reversed field pinch device RFX-mod (R=2 m, a=0.5 m) has started plasma experiments late in 2004. During the first year of operation a gas-puff imaging diagnostic has been used consisting of 32 optical lines of sight measuring radiation emitted from puffed gas on a plane normal to the local magnetic field. Such diagnostic system allows the investigation of the edge plasma properties with high time resolution even at high plasma currents (greater than 1 MA). In the present article a characterization of the equipment is presented. In particular, the dependence of the quality of the signal on the amount of puffed gas as well as the influence of the puffed gas on the plasma discharge are assessed. A comparison has been performed between the use of hydrogen (which is the main discharge gas) and helium as the puffed gas showing that signals are much clearer when helium is used. Spectral and statistical properties of the signals are compared and the results are discussed.
- OSTI ID:
- 20861220
- Journal Information:
- Review of Scientific Instruments, Vol. 77, Issue 10; Other Information: DOI: 10.1063/1.2229272; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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