Electrical conductance decay of interrupted arc columns

Development of a dc, broad beam, Mevva ion source

“…It is also of considerable interest to note that the ratio of beam current to arc current is 4.6% at the current overshoot or 2.3% during the current flat-top. It is known that the total ion current generated by the vacuum arc is 8% -12%, fairly universally [15,18]. Given the 40% grid transparency, we conclude that the amount of plasma that is presented to the extractor is close to the entire amount that is generated by the -7-plasma gun -the plasma expansion chamber and large area extractor configuration are very efficient in teIlDS of plasma utilization.…”

Wall‐stabilized argon arcs at medium pressure

“…The axial potential gradient of the arc plasma was measured by measuring the floating potential of each disk [6]. This method enables one to readily realize the arc condition L/Rs 2 10, and is effective in measuring high arc currents; in our experiment, the arc current exceeds 40 A for the 10-mm hole and 20 A for the 7-mm and 5-mm holes, This disk potential method, however, acompanies large errors if insulation resistance between disk and electrode is small compared to am resistance [7].…”

Ion-enhanced adhesion of thin gold films

“…In the region of the cathode spot, electron emission, vaporisation and ionisation of the cathode metal vapour occur simultaneously such that the spot becomes self-sustaining. The spot or spots move at high velocity and are a source of high currentdensity 10 5 -108 A/cm2 (12). The temperature of the cathode spot has been estimated for a range of cathode materials (13), the value for gold being 3620K.…”