[P-EM17] 宇宙プラズマ科学

[PEM17-04] Formation mechanism of seed-shock in a high-power laser experiment

*松清 修一¹、忍田 昂太郎²、諌山 翔伍¹、森田 太智¹、竹崎 太智³、山崎 了⁴、田中 周太⁴、蔵満 康浩⁵、冨田 健太郎⁶、佐野 孝好⁷、坂和 洋一⁷ (1.九州大学大学院総合理工学研究院、2.九州大学大学院総合理工学府、3.富山大学学術研究部工学系、4.青山学院大学理工学部、5.大阪大学工学部、6.北海道大学工学研究院、7.大阪大学レーザー科学研究所)

キーワード：フル粒子計算、レーザー実験、衝撃波生成

Recently, collisionless shock experiments using high-power lasers have been actively conducted. By filling a chamber with rarefied gas and irradiating a solid target with a laser, the plasma originating from the target acts as a piston, generating shock waves in the gas plasma. However, the detailed mechanism of shock formation remains unclear, preventing precise control over the generated shocks.

In this study, we aim to reproduce the interaction between the gas plasma and target plasma in experiments using Particle-in-Cell (PIC) simulations, with the goal of elucidating the mechanism behind shock formation. As initial conditions, we place a uniform background gas plasma and inject the target plasma from the position X=0 for a finite period. The injection time simulates the laser irradiation time in the experiment. By varying the injection time and other parameters, we discuss how the mechanism of shock formation changes.