### Session TO4: ITER and MFE Physics

9:30 AM–12:30 PM, Thursday, November 17, 2011
Room: Ballroom E

Chair: Andres Dimits, Lawrence Livermore National Laboratory

Abstract ID: BAPS.2011.DPP.TO4.6

### Abstract: TO4.00006 : Resistive Wall Modes Identification and Control in RFX-mod low qedge tokamak discharges

10:30 AM–10:42 AM

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#### Authors:

Matteo Baruzzo
(Consorzio RFX)

Tommaso Bolzonella
(Consorzio RFX)

Roberto Cavazzana
(Consorzio RFX)

Giuseppe Marchiori
(Consorzio RFX)

Lionello Marrelli
(Consorzio RFX)

Piero Martin
(Consorzio RFX)

Roberto Paccagnella
(Consorzio RFX)

Paolo Piovesan
(Consorzio RFX)

Lidia Piron
(Consorzio RFX)

Anton Soppelsa
(Consorzio RFX)

Paolo Zanca
(Consorzio RFX)

Yongkyoon In
(FAR-TECH)

Yueqiang Liu
(CCFE)

Michio Okabayashi
(PPPL)

Manabu Takechi
(JAEA)

Fabio Villone
(CREATE)

In this work the MHD stability of RFX mode tokamak discharges with q$_{edge}<$3 will be studied. The target plasma scenario is characterized by a plasma current 100kA$<$Ip$<$150kA, a Greenwald density fraction included between 0.5 and 1 and a minimum q$_{edge}$=1.7 value. The operation in this regime is limited by the onset of a slowly rotating m=2 n=1 kink mode, which eventually locks to the wall and induces a disruption. The mode growth rates have been characterized with regard to the main plasma parameters and have been compared with predictions by the linear MHD code MARS-F, and the 3D finite elements code CARMA, permitting a full Resistive Wall Mode identification. The stability of the mode in the vicinity of the unstable operational space has been studied using MHD spectroscopy on the (2/1) mode. A good discharge behaviour with q$_{edge}<$2 has been routinely obtained using the RFX-mod MHD active control system, which is capable of fully stabilizing the mode acting on the radial magnetic field at the plasma edge.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.DPP.TO4.6