Abstract
A magnetic field configuration of an island divertor for a quasi-axisymmetric stellarator (CFQS) is proposed. The configuration incorporates large islands surrounding the core confinement region. The interface between the core region and the peripheral region of the island divertor is a clear magnetic separatrix similar to a tokamak divertor. The structure of divertor magnetic field lines is very regular without stochasticity and the connection length is sufficiently long for good divertor performance. Such a divertor configuration is produced in the magnetic field configuration for the CFQS device, which is now under construction in China.
Highlights
In fusion development, tokamak research is in the phase of demonstrating burning plasmas with the thermonuclear test reactor ITER
For the new stellarator CFQS in China, we are designing an island divertor configuration which provides a clear separatrix between the core plasma region and the peripheral plasmas and sufficiently long connection lengths of magnetic field lines between the plasma boundary and the wall
Particles and heat emerging from the core region through the separatrix flow around in the island divertor flux and are absorbed by the divertor plates carefully designed on the wall
Summary
Tokamak research is in the phase of demonstrating burning plasmas with the thermonuclear test reactor ITER. We know that, without the proper design of the magnetic configuration of the peripheral region, the concept is not useful for a fusion reactor. This is called ‘divertor design’ because the most important physics issue related to the peripheral magnetic configuration is particle and heat removal. For the new stellarator CFQS in China, we are designing an island divertor configuration which provides a clear separatrix between the core plasma region and the peripheral plasmas and sufficiently long connection lengths of magnetic field lines between the plasma boundary and the wall. Basic experimental studies for the verification of the island divertor concept for the quasi-axisymmetric stellarators will be possible for the small device with wide flexibility of the operation
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