XGC1 is a gyrokinetic Particle-In-Cell code for simulating plasma turbulence in magnetic confinement fusion devices. It self-consistently solves the kinetic evolution of the charged particle distribution and the electromagnetic fields. Lagrangian equation of motion is used for time advancing the particles, while conserving the mass, canonical angular momentum, and energy. The usual gyrokinetic Poisson equation is solved with the four-point averaging technique. In order to simulate the whole reactor geometry without mathematical difficulties at magnetic null points, XGC1 uses a cylindrical coordinate system for the particle motion and an unstructured mesh for the field solver. An electron sub-cycling scheme is used to accelerate ion-scale simulations.
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