Physics of Velocity and Magnetic Shears in Toroidal Geometries

Join a comprehensive seminar exploring the physics of velocity and magnetic shears in toroidal geometries, presented by Mr. Mingyun Cao from the University of California, San Diego. Delve into the critical roles of velocity and magnetic shears in plasma dynamics and tokamak confinement performance, examining how they affect fluctuation coherence in space and time. Learn about the concept of resonance and discover the analogies between velocity and magnetic shear through the lens of shearing coordinates. Explore the emergence of 'quasi-modes' - effective wave packets of spatially localized resistive interchange modes - and their relationship to ballooning modes in tokamak plasma instability. Understand how quasi-modes serve as a bridge between cylindrical and toroidal geometries, offering insights into toroidicity effects in tokamaks. Conclude with an examination of traditional theoretical methods for studying ballooning modes, including the Bloch eigenmode equation and ballooning mode representation.