GTAW code

 GTAW (acronym for General Tokamak Alfven Wave) is an ideal MHD eigenvalue code which calculates the frequency and mode structure of Alfven eigenmodes in general tokamak geometry.  GTAW reads a G-EQdsk file (g-file) to get the magnetic equilibrium information of an axisymmetric tokamak plasma.  Then GTAW uses the equilibrium information to construct a magnetic surface coordinate system.  Using the above equilibrium and flux coordinate system, GTAW calculates the continua and find global Alfven gap modes. For the details of the model and numerical method used in GTAW, refer to the following documents:

• Numerical study of Alfven eigenmodes in the EAST tokamak,
  Youjun Hu, Guoqiang Li, N. N. Gorelenkov, Huishan Cai, et al., Phys. Plasmas 21, 052510 (2014)

• http://theory.ipp.ac.cn/~yj/research_notes/mhd.pdf

GTAW is a free software which means that you can redistribute it and/or modify it under the terms of the GNU General Public License   as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

The developing of GTAW code was supported by the National Magnetic Confinement Fusion Science Program of China under Grant Nos. 2013GB112010.

 External Library used in GTAW: Lapack. Refer to makefile for compiling and running GTAW

Download GTAW code:

The source code of the latest version of GTAW can be found here

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