Pulsed Cathodic Arc for Forevacuum-Pressure Plasma-Cathode Electron Sources

Abstract

We describe properties and parameters of a pulsed cathodic arc discharge, as applied in forevacuum-pressure plasma-cathode electron sources for the generation of broad electron beams. It is shown that during a single arc current pulse, the arc can operate in either of two modes, differing in their discharge operating voltage and plasma constitution. The radial plasma density distribution approximates a Gaussian. The effect of gas pressure on the plasma density is pronounced only at a considerable distance from the cathode.Index Terms-Cathode spots, cathodic arc, forevacuum, plasma-cathode electron source. and a Senior Physicist and Leader of the Department of Plasma Sources with the High Current Electronics Institute, Siberian Branch of the Russian Academy of Sciences. He has authored or co-authored over 200 papers in the area of basic phenomena in low-pressure gaseous discharges and vacuum arc plasmas, charged particle, emission from low-temperature plasma, ion sources and plasma electron guns, and a range of plasma applications.

Electron-Beam Synthesis and Modification and Properties of Boron Coatings on Alloy Surfaces

“…Figure 2 shows a setup for the modification of boron coatings obtained with a pulsed electron beam. The pulsed electron beam was generated by a fore-vacuum plasma-cathode electron source based on an arc discharge [29]. The electron source was mounted on the vacuum chamber, which was evacuated with an ISP-500C pump.…”

Penentuan Massa Tererosi Untuk Berbagai Material Katoda Ignitor

“…Sistem elektroda pembentuk plasma, mempunyai dua sumber daya yaitu sumber daya ignitor (8) mempunyai spesifikasi tegangan 10 kV, dan energi 100 mJ mengalirkan tegangan melalui anoda (2) dan melalui isolator (3) akan membentuk spot plasma (11) di permukaan katoda (4) melalui proses lucutan permukaan, pada bejana plasma (1) dengan tekanan gas sekitar 10 -4 Torr. Kemudian spot plasma (11) yang terbentuk akan dihamburkan oleh tegangan sumber daya generator plasma (9) dan hamburan spot plasma yang dipercepat oleh tegangan sumber daya generator plasma akan mengionkan gas dalam rongga bejana plasma terbentuk lucutan busur plasma (12) di sekitar daerah anoda berongga (1), dan bila kedua sistem elektroda berjalan serempak maka keseluruhan ruang anoda akan terbentuk lucutan busur plasma. Oleh tegangan pemercepat (10) elektron yang lolos melalui grid (5) akan dipercepat sampai mampu menembus jendela Ti/Be (7) yang selanjutnya dimanfaatkan untuk iradiasi bahan.…”

“…Arus spot plasma umumnya lebih besar untuk material katoda dengan energi kohesif rendah. Parameter dari spot plasma adalah laju erosi ion (ion erosion rate), sedangkan laju erosi ion merupakan karakteristik dari bahan katoda [8][9][10][11]. Semakin besar arus menuju katoda maka semakin besar spot plasma yang dihasilkan sehingga semakin besar pula material katoda yang tererosi [12][13][14][15].…”

Generation of large cross-sectional area electron beams by a fore-vacuum-pressure plasma electron source based on the arc discharge

“…Operation of the arc discharge in the fore-vacuum plasma electron sources has a series of distinctive features associated with the effect of the residual gas ionization on the arc parameters. Study of arc initiation and arc discharge features in the plasma electron source operating in the fore-vacuum pressure range can be found in our earlier papers [9,10].…”