Confinement Study of a Compact Quasiaxisymmetric Toroidal System
We have analyzed the behavior of the diffusion coefficient in a compact toroidal system for a sequence from an axisymmetric to a quasiaxisymmetric configuration (Tab. 1) and for different particle energies by using the VENUS code which has been benchmarked with the MCT code and the GC3 code. The equilibria have been computed with the fixed boundary VMEC code by imposing the i-profile (i(s) = 1- 2/3.s) and a Beta value of ~ 5.90 %. The geometry of the coils (Fig. 1) consists of 10 toroidal coils (TC) wound on a spherical structure of 1.1 [m] radius. Inside the TC, 10 modular helical Furth-Hartman type coils are wound on a sphere of 1 [m]. Moreover, there are 2 vertical field coils (VF) in the polar region which compensate the current flowing in the toroidal arc segments. Two other VF are localized in the mid-plane to provide the plasma position. Moreover, we have studied the feasibility of a Sphellamak reactor design by analyzing the collisionless a-confinement and the diffusion coefficient for Deuterium ions. To realize it, we have multiplied the Fourier components R and Z that describe the last closed magnetic flux surface of the equilibria determined with the fixed boundary VMEC code by a factor of ten as well as the magnetic field strength.
Bibliographic Reference: An article published in: Theory of Fusion Plasmas (2000), pp.401-406
Record Number: 200013674 / Last updated on: 2001-09-18
Original language: en
Available languages: en