Progress report of Japanese simulation research projects using the high-performance computer system Helios in the International Fusion Energy Research Centre

Ishizawa, Akihiro*; Idomura, Yasuhiro; Imadera, Kenji*; Kasuya, Naohiro*; Kanno, Ryutaro*; Satake, Shinsuke*; Tatsuno, Tomoya*; Nakata, Motoki*; Nunami, Masanori*; Maeyama, Shinya*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 92(3), p.157 - 210, 2016/03

http://www.jspf.or.jp/Journal/PDF_JSPF/jspf2016_03/jspf2016_03-157.pdf

The high-performance computer system Helios which is located at The Computational Simulation Centre (CSC) in The International Fusion Energy Research Centre (IFERC) started its operation in January 2012 under the Broader Approach (BA) agreement between Japan and the EU. The Helios system has been used for magnetised fusion related simulation studies in the EU and Japan and has kept high average usage rate. As a result, the Helios system has contributed to many research products in a wide range of research areas from core plasma physics to reactor material and reactor engineering. This project review gives a short catalogue of domestic simulation research projects. First, we outline the IFERC-CSC project. After that, shown are objectives of the research projects, numerical schemes used in simulation codes, obtained results and necessary computations in future.

Alfvn acoustic channel for ion energy in high-beta tokamak plasmas

Bierwage, A.; Aiba, Nobuyuki; Shinohara, Koji

Physical Review Letters, 114(1), p.015002_1 - 015002_5, 2015/01

https://doi.org/10.1103/PhysRevLett.114.015002

Orbit-based analysis of resonant excitations of Alfvn waves in tokamaks

Bierwage, A.; Shinohara, Koji

Physics of Plasmas, 21(11), p.112116_1 - 112116_21, 2014/11

https://doi.org/10.1063/1.4902519

Multi-phase simulation of fast ion profile flattening due to Alfvn eigenmodes in a DIII-D experiment

Todo, Yasushi*; Van Zeeland, M. A.*; Bierwage, A.; Heidbrink, W. W.*

Nuclear Fusion, 54(10), p.104012_1 - 104012_13, 2014/10

https://doi.org/10.1088/0029-5515/54/10/104012

MHD instability excited by interplay between resistive wall mode and stable MHD modes in rotating tokamak plasmas

Aiba, Nobuyuki; Hirota, Makoto*; Matsuyama, Akinobu; Shiraishi, Junya; Bierwage, A.

Proceedings of 25th IAEA Fusion Energy Conference (FEC 2014) (CD-ROM), 8 Pages, 2014/10

A mechanism exciting magnetohydrodynamic (MHD) instabilities in rotating tokamak plasmas is found numerically for the first time. This mechanism is the interplay between a resistive wall mode (RWM) and a stable MHD mode. When the plasma has a stable discrete eigenmode, a reversed shear Alfvn eigenmode (RSAE) for example, a MHD mode is destabilized when plasma equilibrium rotation frequency is similar to the frequency of this stable eigenmode in a static equilibrium. This destabilization is also observed even when the eigenmode couples with Alfvn continua. This result suggests that for steady state high beta tokamaks, like DEMO, it is necessary to shape the safety factor profile in such a way that no stable eigenmode exists in the band of rotation frequency.

Nonlinear simulation of energetic particle modes in JT-60U

Bierwage, A.; Aiba, Nobuyuki; Shinohara, Koji; Todo, Yasushi*; Deng, W.*; Ishikawa, Masao; Matsunaga, Go; Yagi, Masatoshi

Proceedings of 24th IAEA Fusion Energy Conference (FEC 2012) (CD-ROM), 8 Pages, 2012/10

http://www-naweb.iaea.org/napc/physics/FEC/FEC2012/papers/316_THP617.pdf

Orbit-based representation of equilibrium distribution functions for low-noise initialization of kinetic simulations of toroidal plasmas

Bierwage, A.; Di Troia, C.*; Briguglio, S.*; Vlad, G.*

Computer Physics Communications, 183(5), p.1107 - 1123, 2012/05

https://doi.org/10.1016/j.cpc.2012.01.013

Nonlinear hybrid simulations of energetic particle modes in realistic tokamak flux surface geometry

Bierwage, A.; Todo, Yasushi*; Aiba, Nobuyuki; Shinohara, Koji; Ishikawa, Masao; Yagi, Masatoshi

Plasma and Fusion Research (Internet), 6, p.2403109_1 - 2403109_5, 2011/08

https://doi.org/10.1585/pfr.6.2403109

Recent activity of the JAEA theory group towards a better understanding of the effects of flows and energetic particles on the stability of MHD modes

Aiba, Nobuyuki; Ishii, Yasutomo; Bierwage, A.; Hirota, Makoto; Shiraishi, Junya; Yagi, Masatoshi

no journal, , 

Recently, the MHD researchers in JAEA theory group pay attention to the effects of the "plasma flow" and the "energetic particles" on the MHD stability, and achieve many results about them. These parameters are thought as important to understand not only the experimental results in existing devices but also the physics of MHD stability that will be destabilized in ITER. In this workshop, we introduce the recent results of JAEA theory group about these effects on MHD stability to Korean researchers; in particular, we report in detail the results about the rotation effect on the edge localized MHD mode and the application for JT-60U experimental analysis.

Nonlinear simulation of energetic particle driven modes in JT-60U

Bierwage, A.; Aiba, Nobuyuki; Deng, W.*; Ishikawa, Masao; Matsunaga, Go; Shinohara, Koji; Todo, Yasushi*; Yagi, Masatoshi

no journal, ,