http://www.cnr.it/ontology/cnr/individuo/prodotto/ID272537
Tearing mode control in the RFX-mod device (Abstract/Comunicazione in atti di convegno)
- Type
- Label
- Tearing mode control in the RFX-mod device (Abstract/Comunicazione in atti di convegno) (literal)
- Anno
- 2013-01-01T00:00:00+01:00 (literal)
- Alternative label
Lidia Piron; Paolo Zanca; Lionello Marrelli; Paolo Piovesan (2013)
Tearing mode control in the RFX-mod device
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
- Lidia Piron; Paolo Zanca; Lionello Marrelli; Paolo Piovesan (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
- http://www.igi.cnr.it/ish_rfp_ws2013/sites/default/files/attachments/02_Detailed%20programme_chair.pdf;
Oral O26, 20 min. (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-ENEA sulla Fusione, 35127 Padova, Italy (literal)
- Titolo
- Tearing mode control in the RFX-mod device (literal)
- Abstract
- In the last years, the RFX-mod experiment has given
important insights into the physical
mechanisms that rule the tearing mode dynamics in p
resence of magnetic feedback control. The
RFX-mod device is suitable for the study of this to
pic: it is equipped with 192 active coils and a
corresponding grid of radial, toroidal and poloidal
field sensors, which allow a good detection of
unstable modes. Several feedback schemes for tearin
g mode control on RFX have been modelled
through the RFXlocking code [1,2] and tested in rev
ersed field pinch experiments: from the
intelligent shell concept to the clean mode control
[1,3,4,5]. The experience acquired on tearing
mode control recently has been exported in tokamak
plasmas. Common features between such
magnetic configurations have been observed on teari
ng mode control. The most important common
denominator is the importance of the removal from t
he feedback variable of sideband harmonics,
induced by the discrete nature of the active coils,
in order to have an effective action on such
instabilities. In both RFP and tokamak experiments
, the magnetic feedback system reduces tearing
mode amplitude at the plasma edge and maintains the
mode into rotation in the slow frequency
branch, of about 10-100Hz. The magnetic feedback va
riable can also be set to maintain the mode
amplitude at a finite value, by means of helical bo
undary conditions, either rotating or static. On th
e
other hand the feedback action can not fully suppre
ss a tearing mode, but it can at its best replicate
the effect of an ideal shell located at the resisti
ve shell radius. RFXlocking outcomes suggest that i
f
certain physics players are neglected in the moment
um balance equation, such as the electro-
magnetic torque due to the conductive structures an
d the feedback, as well as the viscous torque
related to the plasma flow, as proposed in [6], tea
ring modes can indeed be stabilized against the
RFX-mod experimental evidences.
References
[1] Zanca P. et al 2007 Nucl. Fusion
47
1425
[2] Zanca P. 2009 Plasma Phys. Control. Fusion
51
015006
[3] Martini S. et al 2007 Nucl. Fusion
47
783
[4] Marrelli L. et al 2007 Plasma Phys. Control. Fu
sion
49
B359
[5] Piron L. et al 2010 Nucl. Fusion
50
115011
[6] Richardson A.S. et al 2010 Phys. Plasmas
17
112511 (literal)
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