Cathode configuration influence on low-inductance vacuum spark plasma dynamics

2nd Conference on Plasma & Laser Research and Technologies

Sarantsev, S.A.^1 ; Dvoeglazov, Ya M.^1 ; Dodulad, E.I.^1 ; Raevsky, I.F.^1 ; Savjolov, A.S.^1

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe highway 31, Moscow

115409, Russia^1

关键词: Behavior change;    Cathode surface;    Electrode systems;    Molecular nitrogen;    Plasma density gradient;    Plasma dynamics;    Radiation source;    Trigger positions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/747/1/012016/pdf
DOI  :  10.1088/1742-6596/747/1/012016

来源: IOP

【 摘 要 】

The results of studies of cathode configuration influence on high current low- inductance vacuum spark (HLVS) plasma dynamics are presented in this work. The research was carried out on PION installation using shadowgraphy method. Molecular nitrogen laser (λ = 337 nm) was used as a radiation source. It was determined that the HLVS behavior changes with the increase of number of discharges. In a fresh electrode system (less than 200 discharges) the dependence of constriction position on the discharge trigger position is observed during HLVS development. Also, high gradients of plasma density and secondary constrictions are observed. In a previously exploited electrode system (more than 300 discharges) HLVS behavior changes: plasma density gradients become less expressed, secondary constrictions disappear. In electrode systems with highly developed cathode surface plasma density gradient distribution pattern only slightly changes from discharge to discharge, e.g. the discharge becomes more stable.