Journal of International Proceedings on Mechanics and Electromagnetic

Modulation of Schamel's nonlinear Schrödinger equation and related sheath excitations in degenerate relativistic quantum complex plasmas: A review

Dhani Maulana Efendi — Wed, 30 Apr 2025 00:00:00 +0700

Degenerate relativistic quantum plasmas are intricate systems in which high-density electrons demonstrate relativistic and quantum mechanical properties. These conditions result in non-linear phenomena, such as soliton production, which are essential for energy transfer and stability analysis. The Schamel nonlinear Schrödinger equation offers a framework for examining wave dynamics in these conditions, integrating fractional non-linearities that elucidate modulation instability and envelope solitons. This study examines the impact of critical physical parameters, including the relativistic degeneracy ratio, ion trapping, and density ratio, on soliton dynamics. The results indicate that the relativistic degeneracy ratio strongly influences wave frequency, group velocity, and energy transport efficiency, particularly in ultra-relativistic plasmas. The research emphasizes the mitigating effects of heightened electron degeneracy pressure, which stabilises waves and diminishes soliton amplitude. The vortex-like arrangement of trapped ions enhances the non-linear dynamics of plasma. These findings enhance our comprehension of wave propagation, energy distribution, and stability in extreme plasma conditions.

Improved positron generation via laser plasma interaction utilising target front surface architecture: A review

Doana Kezia Putri Pashya — Wed, 30 Apr 2025 00:00:00 +0700

Positrons are electron antiparticles that are often produced in extreme astrophysical events, such as black holes and quasars. Positron production in the laboratory is typically done through plasma-laser interactions, utilizing the Bethe-Heitler process which involves the interaction of high-energy photons with the electromagnetic fields of atomic nuclei. One of the main challenges is to improve the efficiency of laser energy conversion into electron-positron pairs. This research utilizes a silicon microwire-based target surface structure to improve the positron production efficiency in laser plasma interactions. Particle-in-cell (PIC) simulations and experiments with the OMEGA EP laser system show that target structure 1 produces 50% more positrons than a flat surface target, with the conversion efficiency of laser energy to positrons increasing to 97%. This structure enables optimal laser energy focusing, resulting in efficient high-energy relativistic electrons to create electron-positron pairs. The results of this study show significant potential in the development of particle acceleration technology and applications in high-energy physics.

Assessment of groundwater quality and rainfall analysis: A review

Lidya Marissa Br Siagian — Wed, 30 Apr 2025 00:00:00 +0700

Groundwater is a critical resource in the hydrological cycle, serving as the source of life and a major component of the earth's water cycle. Groundwater quality is influenced by rainfall patterns and hydrogeological systems, including complex uncertainty factors. Rainfall, measured by intensity and duration, can influence variations in water flow and flood potential, especially in areas with different catchment characteristics. This study analyzed the relationship between rainfall and groundwater quality using an elasticity approach, which is the ratio of the relative change in river flow to the relative change in rainfall. Data were analyzed using elasticities y₁ and y₂ to identify the sensitivity of streamflow to rainfall in wet and dry catchments. Results show that dry areas exhibit higher elasticity to changes in rainfall than wet areas. These findings highlight the importance of rainfall patterns on groundwater quality and the need for stakeholder involvement in water resources management.