Title :
Cathode Plasma Jet Pinching and Intense X-Ray Emission in a Moderate-Current Laser-Triggered Vacuum Discharge
Author :
Moorti, Anand ; Rao, Bobbili Sanyasi ; Naik, Prasad Anant ; Gupta, Parshotam Dass ; Romanov, Igor Vladimirovich ; Korobkin, Yuriy Vasilievich ; Rupasov, Alexander Alexandrovich
Author_Institution :
Laser Plasma Div., Raja Ramanna Centre for Adv. Technol., Indore
Abstract :
Occurrence of cathode plasma jet pinching and its dependence on anode-cathode separation (d=2-10 mm) in a moderate-current (~10 kA) low-energy (les 20 J) vacuum discharge is presented. Discharge was created between a planar titanium cathode and a conical point-tip titanium anode by producing plasma on the cathode using 27-ps-duration laser pulses. For d=2-3 mm, constricted flow of cathode plasma jet up to anode was observed along with multiple feeble local pinchings. A neck formation was observed for d=5-6 mm, whereas multiple pinching occurred for larger separations. Temporal profiles of the X-ray emission from the anode due to bombardment by electrons extracted from the expanding cathode plasma, for different anode-cathode separations, were consistent with the characteristics of cathode plasma jet pinching
Keywords :
anodes; cathodes; pinch effect; plasma X-ray sources; plasma diagnostics; plasma jets; plasma production by laser; vacuum arcs; 2 to 10 mm; 27 ps; anode-cathode separation; cathode plasma jet pinching; conical point-tip titanium anode; intense X-ray emission temporal profiles; moderate-current laser-triggered vacuum discharge; moderate-current low-energy vacuum discharge; multiple local pinchings; planar titanium cathode; plasma production; Anodes; Cathodes; Electron emission; Laser modes; Neck; Optical pulses; Plasma properties; Plasma x-ray sources; Titanium; X-ray lasers; Laser triggered; X-ray emission; plasma pinch; vacuum discharge;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2006.883389
