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# 27th IAEA Fusion Energy Conference - IAEA CN-258

22-27 October 2018
Mahatma Mandir Conference Centre
Asia/Kolkata timezone
CONFERENCE MATERIAL NOW AVAILABLE!

## Resistive Wall Mode physics and control challenges in JT-60SA high βN scenarios

25 Oct 2018, 08:30
4h
Mahatma Mandir Conference Centre

Poster

### Speaker

Dr Leonardo Pigatto (ItRFX)

### Description

The superconducting tokamak JT-60SA is being built in Naka (Japan) under the Broader Approach Satellite Tokamak Programme jointly by Europe and Japan, and under the Japanese national programmme. JT-60SA has an important supporting mission for the development of fusion energy: designed to achieve long pulses (100 s) and break-even equivalent plasmas, challenging high $\beta$ operation beyond the no-wall limit. It will help in both the exploitation of ITER and in the definition of an optimized DEMO design. The device will be equipped with off-axis Negative-NBI at 0.5 MeV beam energy, allowing current profile tailoring for Advanced Tokamak scenarios with fully non-inductive current drive. The focus of the work is set on high β N scenarios, in which kink-like instabilities (e.g. one or more RWMs) are potentially unstable and possibly lead to disruptions. In the framework of a joint European-Japanese collaboration, coordinated effort on MHD stability and control modeling is ongoing for the safe realization and exploitation of high $\beta_N$ plasmas. These scenarios offer a great opportunity to test and verify present models of RWM physics. The drift-kinetic damping model in particular will be considered in the present work, with a stability study in Scenario 5.1 – like plasmas carried out with MARS-F/K. The challenge of active control is also addressed, taking advantage of the set of RWM Control Coils that JT-60SA will have. A dynamic simulator, based on the CarMa code, has been developed for feedback control modeling. A demonstration of this tool is given in one of the aforementioned plasmas, showing potential applications, results and latest developments.
Country or International Organization Italy TH/P5-23

### Co-authors

Prof. Fabio Villone (ItENEACREATE) Dr Giuseppe Marchiori (ItRFX) Dr Go Matsunaga (JpQSTNFI) Dr Manabu Takechi (JpQSTNFI) Dr Stefano Mastrostefano (DEIM, Università della Tuscia, Largo dell'Università, 01100 Viterbo, Italy) Tommaso BOLZONELLA (ItRFX) Dr Yueqiang Liu (UsGA)