Electron plasma diagnostics in ELTRAP by electron cyclotron resonance heating method

Area of Science:

• Plasma Physics
• Computational Electromagnetics

Background:

• Electron cyclotron resonance heating (ECRH) is crucial for plasma confinement.
• Understanding plasma behavior under varying RF conditions is essential for device optimization.

Purpose of the Study:

• To analyze heating phenomena, axial kinetic energy, and self-consistent electric fields in confined electron plasma using ECRH.
• To investigate the effects of different RF drives and amplitudes on plasma parameters in the ELTRAP device with hydrogen and helium background gases.

Main Methods:

• Utilized Particle-in-Cell (PIC) code for electromagnetic simulations.
• Performed simulations at constant power (3.8 V) across a range of RF drives (0.5–8 GHz) and varying amplitudes (1–3.8 V) at 1 GHz.
• Analyzed plasma behavior in the ELTRAP device using hydrogen and helium background gases.

Main Results:

• Maximum axial and radial temperature impacts were observed at 1.8 V and 5 GHz for both gases.
• Higher RF frequencies led to increased ionization and secondary electron production, with hydrogen showing a maximum radial temperature of 170.41 eV.
• Axial kinetic energy was most effective in the outer radial regions (0.03–0.04 m).
• Helium plasma exhibited a higher self-consistent electric field at 5 GHz RF.
• Excitation and ionization rates were greater radially than axially, particularly in helium.

Conclusions:

• The study identifies optimal ECRH parameters (5 GHz, 1.8 V) for enhanced plasma heating and energy transfer in the ELTRAP device.
• Simulation results highlight the influence of background gas type (hydrogen vs. helium) and RF parameters on plasma dynamics.
• Findings are relevant for applications in nuclear physics, beam physics, microelectronics, and coherent radiation devices.