http://www.cnr.it/ontology/cnr/individuo/prodotto/ID272792
Ion temperature measurements in RFX-mod (Abstract/Poster in atti di convegno)
- Type
- Label
- Ion temperature measurements in RFX-mod (Abstract/Poster in atti di convegno) (literal)
- Anno
- 2013-01-01T00:00:00+01:00 (literal)
- Alternative label
R. Lorenzini; F. Auriemma; L. Carraro; R. Cavazzana; P. Franz; E. Martines; M.E. Puiatti; P. Scarin; W. Schneider; B. Zaniol; M. Zuin (2013)
Ion temperature measurements in RFX-mod
in Joint 19th ISHW and 16th IEA-RFP workshop, Padova, Italy, September 16-20, 2013
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- R. Lorenzini; F. Auriemma; L. Carraro; R. Cavazzana; P. Franz; E. Martines; M.E. Puiatti; P. Scarin; W. Schneider; B. Zaniol; M. Zuin (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
- http://www.igi.cnr.it/ish_rfp_ws2013/sites/default/files/attachments/poster%20list-webLinks.pdf; Poster number I21. (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
- http://www.igi.cnr.it/ish_rfp_ws2013/sites/default/files/attachments/12_BookOfAbstracts.pdf (literal)
- Note
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- 1-8, 10-11 : Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione 35127 Padova, Italy /
9 : Max-Planck -Institut für Plasmaphysik, EURATOM Association, Teilinstitut Greifswald,
Wendelsteinstra?e 1, D-17491 Greifswald, Germany. (literal)
- Titolo
- Ion temperature measurements in RFX-mod (literal)
- Abstract
- A Neutral Particle Analyzer (NPA) of the ACORD series, developed by theIOFFE Institute of the
Russian Academy of Sciences has been put in operation in the RFX-mod device. It resolves the
energy distribution of the neutral hydrogen particles produced by charge exchange (CX) processes
and leaving the plasma.
A first estimate of the ion temperature Ti is deduced from the logarithmic slope of collected spectra.
A more detailed calculation of Ti is performed according to the method suggested in Schlatter,
PPCF 2006.. The method gives information on the ion temperature profile matching the
experimental and the calculated spectrum of particle flux, taking also into accountthe effect on the
neutral spectrum of the attenuation processes. The density and the energy of both first generation
and energetic neutrals are calculated with the MonteCarlo code Nenè
The analyses show a dependence of the ion temperature on the plasma density. At low density (ne<=
3e-19m-3) the calculated Ti values are lower than the electron temperatureTe, as expected in the
framework of a collisional transfer of energy from electrons to ions.
When the density increases Ti becomes equal to Te (ne=4-5e-19m-3), and then it raises up to three
times higher than Te (ne>1e-20m-3) reaching 600-700eV, suggesting the presence of an anomalous
ion heating mechanism. It is worth noting that in this density regime the measurements of NPA
refer to the external region (r/a ~0.8).
The temperature of impurities is estimated from Doppler broadening spectroscopic measurements.
A good agreement is found between the hydrogen and the CV and BV (associated radial positions
averaged on the emissivity profile r/a~0.8-0.9 and r/a~0.6-0.7) ion temperatures at low density,
while at higher density the impurity temperature is weakly decreasing with the density and never
exceeds 300 eV.
Further insight is expected from the measurements of neutron flux that will be performed during
discharges in deuterium which are planned in the next experimental campaign in RFX-mod. (literal)
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