Abstract
The Coulomb collision effects on a saturated electrostatic potential (plug potential) formation in the end-mirror cell of a tandem mirror were investigated by a Monte Carlo simulation of ion orbits. A non-Maxwellian electron distribution function, which leads to a modified Boltzmann law, is assumed to obtain the electrostatic potential. An ion velocity distribution is determined by the Monte Carlo simulation of ions. It was found that a saturated electrostatic potential is formed in a wide range of the Coulomb collisionality. Especially, fewer Coulomb collisions were found to create a higher saturated electrostatic potential along a magnetic field, although the Coulomb collisions are necessary for a saturated electrostatic potential formation.
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