VELOCITIES OF COPPER AND SILVER IONS GENERATED FROM AN IMPULSE VACUUM-ARC

Vacuum gaps with copper and silver needle cathodes were fired by a 13 mu s duration half-cycle sinusoidal are, and charge states of the ions were analyzed using the time of flight (TOF) method at different posi tions in the direction perpendicular to the electrode axis, Velocities of each charge state ion were determined assuming a collisionless fli ght from the cathode region to the outside of the gap, The velocities of the fastest ions of copper and silver are 2.1 and 1.6 x 10(4) m/s, respectively, regardless of the charge state, The velocities of the io ns released with the are extinction are lower, and differ depending on the state of the charge.