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Cathode Plasma Jet Pinching and Intense X-Ray Emission in a Moderate-Current Laser-Triggered Vacuum Discharge

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7 Author(s)
Moorti, A. ; Laser Plasma Div., Raja Ramanna Centre for Adv. Technol., Indore ; Rao, B.S. ; Naik, P.A. ; Gupta, P.D.
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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

Published in:

Plasma Science, IEEE Transactions on  (Volume:34 ,  Issue: 5 )

Date of Publication:

Oct. 2006

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