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8 Apr 2002

Volume 80, Issue 14, pp. 2433-2611

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Angularly resolved measurements of ion energy of vacuum arc plasmas

André Anders and George Yu. Yushkov

Appl. Phys. Lett. 80, 2457 (2002); http://dx.doi.org/10.1063/1.1468271 (3 pages) | Cited 9 times

Online Publication Date: 2 April 2002

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The kinetic energy of ions generated by pulsed vacuum arcs was measured with angular resolution in the interval −90° to +90° with respect to the cathode normal. A current perturbation method in conjunction with drift time measurements was used. Cathode materials included C, Mg, Ti, Cu, Ag, Ta, and Pb with an average arc current of 300 A and 600 μs duration. The measured angular energy distributions are slightly peaked at the cathode normal. Each distribution can be fitted by a superposition of an isotropic component and a cosine function, with the isotropic component dominating. This result is in contrast to plasma jet formation observed by others, which is most likely due to effects of anode geometry and magnetic fields, including the self-field of the current-carrying plasma. © 2002 American Institute of Physics.
Show PACS
52.80.Vp Discharge in vacuum
52.80.Mg Arcs; sparks; lightning; atmospheric electricity
52.30.-q Plasma dynamics and flow
52.70.Nc Particle measurements
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