Author:
Zagórski R.,Candeloro V.,Sartori E.,Serianni G.
Abstract
Abstract
The ITER fusion reactor will be heated by fast neutral beams generated by accelerating and
neutralizing negative ions, produced in a RF inductively-coupled plasma which expands through a
region featuring a magnetic filter. During the current shut down of the SPIDER device (until 2023)
some modifications of the device have been planned to improve the system performance. These
modifications are based on the experience gained during operation of SPIDER in previous years and
include, among others, the addition of further sets of permanent magnets in the expansion chamber
of the plasma source and around the RF drivers. The purpose of these modifications is to improve
plasma confinement, and thus increase its density and homogeneity. The present paper reports the
results of numerical studies of the plasma parameters in SPIDER source with different types of
modifications of SPIDER device including new permanent magnets configurations. Analysis are done
by means of the numerical code FSFS2D in which a self-consistent two-dimensional fluid description
of the source is implemented. In order to partially account for the 3D flow pattern within our 2D
model, simulations are run in two different layouts, in the vertical plane with the magnetic
filter being perpendicular to the integration domain and in the horizontal plane with the filter
field in the integration surface. Simulation results indicate, that the permanent magnets around
the RF driver tends to increase the plasma density in the driver.
Subject
Mathematical Physics,Instrumentation