Computational Physics

Electron Cyclotron Resonance Ion Sources (ECRIS) are devices predomi-
nantly designed to generate highly charged ion beams. In these systems,
a minimum-B magnetic trap formed by the superposition of an axial mag-
netic field produced by a pair of current coils and a radial magnetic field
formed by a cusp multipole system is harnessed for plasma confining. In
this work, plasma heating in a T E 111 cavity excited by 2,45 GHz microwave
energy at electron cyclotron resonance conditions is studied numerically.
The interaction of hydrogen plasma particles with microwaves is simulated
through a a 3D relativistic code Particle-In-Cell (PIC) developed by us. The
magnetostatic field is calculated using the Biot-Savart law. The evolution of
the self-consistent electromagnetic field is determined through the Yee’s met-
hod. The plasma current density is calculated starting off with the particles
positions and their velocities via a conservative charge method proposed by
T. Umeda. New positions and velocities are calculated solving the relativistic
Newton-Lorentz equation by using the Boris method.
We present the spatial distribution of electrons and their energetic spec-
trum after 96 ns of calculations at an initial homogeneous plasma density
of 2 × 10 10 cm −3 , and a maxwellian distribution for velocities with an initial
electron temperature of 5,44 × 10 −4 eV . The simulation has revealed that the
electron population can be divided into three types: cold (with the energy
less than 1 keV ), hot (of 1 − 10 keV ) and superhot (with the energy higher
than 10 keV ).

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