01808nas a2200241 4500008004100000022001500041245010500056210006900161260001200230300001200242490000700254520105000261653001501311653002401326653002201350653002501372653002101397100001801418700001801436700001901454700001901473856007401492 2004 eng d a0093-3813 00aEffect of Ion Mass and Charge State on Transport Vacuum Arc Plasmas Through a Biased Magnetic Filter0 aEffect of Ion Mass and Charge State on Transport Vacuum Arc Plas c04/2004 a433-4390 v323 a
The effect of ion mass and charge state on plasma transport through a 90 deg.-curved magnetic filter is experimentally investigated using a pulsed cathodic arc source. Graphite, copper, and tungsten were selected as test materials. The filter was a bent copper coil biased via the voltage drop across a low-ohm, selfbias resistor. Ion transport is accomplished via a guiding electric field, whose potential forms a trough shaped by the magnetic guiding field of the filter coil. Evaluation was done by measuring the filtered ion current and determination of the particle system coefficient, which can be defined as the ratio of filtered ion current, divided by the mean ion charge state, to the arc current. It was found that the ion current and particle system coefficient decreased as the mass-to-charge ratio of ions increased. This result can be qualitatively interpreted by a very simple model of ion transport that is based on compensation of the centrifugal force by the electric force associated with the guiding potential trough.
10aArc plasma10acathodic vacuum arc10aion charge states10amacroparticle filter10aplasma transport1 aByon, Eungsun1 aKim, Jong-Kuk1 aKwon, Sik-Chol1 aAnders, André uhttps://facades.lbl.gov/publications/effect-ion-mass-and-charge-state