# Linear simulation of ion temperature gradient driven instabilities in W7-X and LHD stellarators using GTC

## TL;DR

This paper demonstrates the use of the upgraded GTC code to perform linear simulations of ion temperature gradient driven instabilities in stellarators W7-X and LHD, analyzing mode structures and convergence properties.

## Contribution

It introduces the capability of GTC to simulate ITG instabilities in non-axisymmetric stellarator configurations for the first time.

## Key findings

- Successful linear simulations of ITG in W7-X and LHD
- Analysis of mode structures and convergence properties
- Insights into the characteristics of ITG in stellarators

## Abstract

The global gyrokinetic toroidal code (GTC) has been recently upgraded to do simulations in non-axisymmetric equilibrium configuration, such as stellarators. Linear simulation of ion temperature gradient (ITG) driven instabilities has been done in Wendelstein7-X (W7-X) and Large Helical Device (LHD) stellarators using GTC. Several results are discussed to study characteristics of ITG in stellarators, including toroidal grids convergence, nmodes number convergence, poloidal and parallel spectrums, and electrostatic potential mode structure on flux surface.

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Source: https://tomesphere.com/paper/1702.02725