Laser Plasmas : Density oscillations in laser produced plasma decelerated by external magnetic field

Pramana

V N Rai1¹  H C Pant¹  M Shukla¹ 

[1] Laser Plasma Division, Centre for Advanced Technology, Indore 452 013, India$$

关键词: Ion saturation current;    large Larmor radius instability.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

This paper presents the dynamics as well as the stability of laser produced plasma expanding across the magnetic field. Observation of some high frequency fluctuations superimposed on ion saturation current along with structuring in the pin hole images of x-ray emitting plasma plume indicate the presence of instability in the plasma. Two type of slope in the variation of x-ray emission with laser intensity in the absence and presence of magnetic field shows appearance of different threshold intensity of laser corresponding to each magnetic field at which this instability or density fluctuation sets on. This instability has been identified as a large Larmor radius instability instead of classical Rayleigh-Taylor (R-T) instability.

【 授权许可】

Unknown