[11a-E204-10~11] 8.6 Plasma Electronics English Session

11:30 AM - 11:45 AM JST(2:30 AM - 2:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation AwardEnglish Presentation

[11a-E204-10] Development Updates on Dispersion Interferometer-Based Nanosecond Diagnostics for Laser-Produced Plasma

〇(D)Xin Jin¹, Kenji Tanaka^1,2, Chihiro Suzuki² (1.Kyushu University, 2.NIFS)

Keywords:

Laser produced plasma,Dispersion Interferometor,Diagnostics

This study presents recent development updates on a dispersion interferometer (DI) utilized for nanosecond-resolved electron density diagnostics of laser-produced plasma (LPP). To resolve initial signal anomalies and the lack of symmetry in previous four-phase scanning measurements caused by refractive effects, two key system upgrades were implemented: relocating the wedge ahead of the vacuum chamber to manage beam divergence differences, and introducing a 4-f imaging system to refocus the refracted light onto the detector. These modifications successfully mitigated the refraction issues, allowing the genuine phase-change peak to be temporally separated from initial stray radiation. Consequently, the upgraded setup achieved clear signal symmetry in measurements taken 0.4 mm from the target, and successfully revealed that the temporal evolution of LPP electron density exhibits multiple stages with distinct slopes.