UKAEA Papers

"Comparing electromagnetic instabilities in global gyrokinetic simulations with local and MHD models"

• J. P. Martin-Collar
• B. F. McMillan
• S. Saarelma
• A. Bottino

We perform a study of system-scale to gyro-radius scale electromagnetic modes in a pedestal-like equilibrium using a gyrokinetic code ORB5, and compare to the results of a local gyrokinetic code, GS2, and an MHD energy principle code, MISHKA. In the relevant large-system, short wavelength regime, good agreement between the gyrokinetic codes is foun…

"Global gyrokinetic turbulence simulations of MAST plasmas."

• S. Saarelma
• P. Hill
• A. Bottino
• G. Colyer
• A.R. Field
• B. Mcmillan
• A. Peeters
• C.M. Roach
• Mast Team

Electrostatic gyrokinetic analyses are presented for an L-mode discharge with an internal transport barrier, from the spherical tokamak, MAST. Local and global microstability analysis finds similar linear growth rates for ion temperature gradient (ITG) driven modes. When the electron response is assumed to be adiabatic, growth rates are found to be…

"Global Turbulence Simulations of CYCLONE Base Case and MAST Plasmas"

• S. Saarelma
• R. Akers
• M. Reshko
• Cm. Roach
• M. Romanelli
• A. Thyagaraja
• Mast Team
• A. Peeters
• A. Bottino
• S. Jolliet