학술논문
Ions emitted by a pulsed titanium-hydride spark plasma source
Document Type
Conference
Author
Source
Proceedings of 17th International Symposium on Discharges and Electrical Insulation in Vacuum Discharges and electrical insulation in vacuum Discharges and Electrical Insulation in Vacuum, 1996. Proceedings. ISDEIV., XVIIth International Symposium on. 1:194-198 vol.1 1996
Subject
Language
Abstract
The mass and velocity distributions of ions from a pulsed titanium-deuteride arc plasma source in vacuum were measured by a time-of-flight mass spectrometer. The arc source consisted of a thin deuterium-loaded titanium layer between two electrodes on an alumina substrate with a narrow groove across the center. Operation of the plasma source by 0.25, 0.75, and 2.1 /spl mu/s 100 A pulses eroded the cathode side of the groove. The deuterium ions were found to have mean velocities only 20% higher than the /sup ++/Ti ions. Almost all the deuterium ions were emitted during the first 0.75 /spl mu/s of the pulse. The titanium ions had charge states of 1+, 2+, and 3+, with 2+ predominating. Their mean energy-per charge state decreased slightly with increasing charge state. The findings are interpreted as arising from a dense cathode spot in which acceleration of the ions occurs and in which ion-ion and ion-atom collisions slow down the very light ions.