Abstract
The particle confinement properties of plasma confinement systems that employ dual levitated magnetic coils are investigated using classical trajectory Monte Carlo simulations. Two model systems are examined. In one, two identical current-carrying loops are coaxial and separated axially. In the second, two concentric and coplanar loops have different radii and carry equal currents. In both systems, a magnetic null circle is present between the current loops. Simulations are carried out for seven current loop separations for each system and at numerous values of magnetic field strength. Particle confinement is investigated at three locations between the loops at different distances from the magnetic null circle. Each simulated particle that did not escape the system exhibited one of four modes of confinement. Reduced results are given for both systems as the lowest magnetic field strength that exhibits complete confinement of all simulated particles for a particular loop separation.
Highlights
A number of early plasma confinement approaches have been studied that make use of one or more current-carrying coils immersed in the confined plasma.[1,2,3] work on approaches using immersed current-carrying coils slowed as tokamaks became preferred in fusion energy research
A magnetic null circle is present between the current loops
Two identical current loops are coaxial with the z axis, with one loop centered at a small distance above and the other the same distance below the coordinate origin
Summary
A number of early plasma confinement approaches have been studied that make use of one or more current-carrying coils immersed in the confined plasma.[1,2,3] work on approaches using immersed current-carrying coils slowed as tokamaks became preferred in fusion energy research (see discussion in Ref. 4). Some recent experiments make use of a single coil immersed in the confined plasma. Examples include the Levitated Dipole Experiment (LDX)[5] and Ring Trap 1 (RT-1),[6,7] both of which demonstrate the use of a levitated superconducting coil to magnetically confine the surrounding plasma. Each system consists of dual, levitated, coaxial coils carrying identical current. Two identical current loops are coaxial with the z axis, with one loop centered at a small distance above and the other the same distance below the coordinate origin. The model consisting of axially separated loops will be referred to as the stacked system, and the model with concentric and coplanar loops will be referred to as the coplanar system. The term ‘system’ will be used to designate either the coplanar or stacked model, throughout
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