http://www.cnr.it/ontology/cnr/individuo/prodotto/ID272542
Te from SXR in Reversed Field Pinches: 2D imaging of 3D structures (Abstract/Poster in atti di convegno)
- Type
- Label
- Te from SXR in Reversed Field Pinches: 2D imaging of 3D structures (Abstract/Poster in atti di convegno) (literal)
- Anno
- 2013-01-01T00:00:00+01:00 (literal)
- Alternative label
P. Franz; M. Gobbin; L. Marrelli; A. Ruzzon; F. Bonomo; A. Fassina; E. Martines; M.B. McGarry; D.J. Den Hartog; J.A. Goetz; J. Johnson; M. Reyfman; M.A. Thomas (2013)
Te from SXR in Reversed Field Pinches: 2D imaging of 3D structures
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
- P. Franz; M. Gobbin; L. Marrelli; A. Ruzzon; F. Bonomo; A. Fassina; E. Martines; M.B. McGarry; D.J. Den Hartog; J.A. Goetz; J. Johnson; M. Reyfman; M.A. Thomas (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 B2 (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
- 1-7 : Consorzio RFX, Associazione Euratom-ENEA, Padova Italy /
8-13 : University of Wisconsin-Madison and CMSO. (literal)
- Titolo
- Te from SXR in Reversed Field Pinches: 2D imaging of 3D structures (literal)
- Abstract
- Reconstruction of the soft x
-
ray (SXR) emissivity map is an important tool in fusion devices due to the
tight link with transport and Magnetohydrodynamic (MHD) equilibrium.
A notable example is the
occurrence of helical magnetic self
-
organized structures in the core of the reversed field pinch during
Quasi Single Helicity (QSH) plasmas, when a single
m=1
tearing mode dominates the MHD magnetic
spectrum and all remaining modes
have reduced amplitudes. More valuable information can be
obtained taking into account the strong dependence of the continuum SXR radiation on electron
temperature
T
e
: the direct
-
brightness two
-
color technique can be applied to line integrated
measurement
s to obtain the
T
e
along the designed lines of sight.
A sophisticated multi
-
chord diagnostic has been developed on RFX
-
Mod for SXR emissivity and
electron temperature profiles measurements, with good spatial and temporal resolution to identify
helical stru
ctures and track fast events
[1]
. An advanced instrument, similar to that of RFX
-
Mod, has
been designed and installed also on MST
[2]
.
This allows the study of QSH plasmas in both RFPs.
To improve the SXR and
T
e
data reconstruction in the presence of helical magne
tic equilibria, mapping
algorithms that reproduce the magnetic topology during the QSH regimes have been
developed to map
the measurements on flux surfaces.
The analysis shows, in RFX
-
Mod, a clear difference in
the
temperature gradient (related to the pres
ence
of transport barriers) between the rising phase of QSH and the saturated (or flattop) phase. In the rising
phase
a
correlation of temperature gradient with magnetic spectrum is
found
, showing a positive trend
between dominant mode amplitude and therma
l structure dimension, as well as a negative correlation
of secondary modes amplitudes and temperature gradient. On the other hand, in the flattop phase the
presence of a thermal structure is intermittent, with several crashes and flattening of the profile
, and
much
less influenced by the magnetic dynamics.
On the other hand, measurements at MST confirm the correlation between magnetic QSH and the
appearance of a SXR structure in the emissivity distribution, but no clear indication of a thermal
structure in
the Te profile has been found, indicating a different origin of the SXR island.
References
[1]
P. Franz,
et al.
,
Nucl. Fusion,
53
053011 (2013)
[2]
M. B. McGarry,
et al.
,
Rev. Sci. Instrum.
83
, 10E129 (2012) (literal)
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