Physics and engineering design of the low aspect ratio quasi-axisymmetric stellarator CHS-qa

摘要

A low aspect ratio quasi- axisymmetric stellarator, CHS-qa, has been designed. An opti- mization code has been used to design a magnetic field configuration with evaluations of the following physical quantities: quasi-axisymmetry, rotational transform MHD stability and alpha particle col- lisionless confinement. It is shown that the electron neoclassical diffusion coefficient is similar to that of tokamaks for the low collisional regime. A self-consistent equilibrium with bootstrap cur- rent confirms the global mode stability up to 130 kA for an R=1.5 m and B_t=1.5 T device.