http://www.cnr.it/ontology/cnr/individuo/prodotto/ID272714
Spectral properties of helical RFP equilibria (Abstract/Poster in atti di convegno)
- Type
- Label
- Spectral properties of helical RFP equilibria (Abstract/Poster in atti di convegno) (literal)
- Anno
- 2013-01-01T00:00:00+01:00 (literal)
- Alternative label
I. Predebon; B. Momo; D. Terranova (2013)
Spectral properties of helical RFP equilibria
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
- I. Predebon; B. Momo; D. Terranova (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 D2. (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
- Consorzio RFX, Associazione Euratom-ENEAsulla Fusione, Padova, Italy (literal)
- Titolo
- Spectral properties of helical RFP equilibria (literal)
- Abstract
- The helical states commonly occurring in high current RFX-mod plasmas are now routinely
reconstructed by means of the equilibrium code VMEC[1], modified to suit the RFP configuration
[2]. The existence of such equilibria is the basis on which several stability and transport studies can
be established. In this context, one of the important questions to be addressed is the occurrence of
resonant tearing instabilities in helical plasmas, which tend to braid the magnetic field and to
provide, consequently, one of the most dangerous sources of particle and energy transport. In order
to quench them, we have first to understand what they look like when seen by the (inherently
toroidal) set of edge magnetic probes.
The aim of this work is indeed to clarify some aspects related to the mutual spectral properties of
axisymmetric and helical MHD equilibria. In particular we will deal with i) the toroidal/cylindrical
mode spectrum produced by helical equilbria; ii) related to this, the problem of the magnetic mode
spectrum to be set by the mode-control system to get helical states with zero-amplitude secondary
modes; iii) the richness of the (tearing) helical spectrum related to a single Fourier harmonic
imposed by the mode-control system; iv) the shape of the related eigenfunctions in helical
geometry.
A comparison with the perturbative Newcomb's approach in toroidal geometries will be also carried
out, so as to understand if the present method can be a valid alternative to the solution of the
Newcomb's equation in helical geometry. Furthermore, since the method can be applied to any
VMEC equilibrium, similar considerations will be made for the tokamak and stellarator
configuration.
References
[1] S.P. Hirshman and J.C. Whitson, Phys. Fluids 26(1983) 3554
[2] D. Terranova et al., Plasma Phys. Control. Fusion 52, 124023 (2010) (literal)
- Prodotto di
- Autore CNR
Incoming links:
- Autore CNR di
- Prodotto