Study Of Guiding Effect Of Slow Highly Charged Ions By Capillary Membranes In Insulators

Guiding effect of slow highly charged ions by capillary membranes ininsulators has excellent prospect in application at ion optics.Experimentally we studyguiding effect of slow O^q+ions through capillaries in Al₂O₃ membranes.We find that emission angles of the ions relative to the capillary tilt anglesexhibit diversity,i.e."emission angles equalling the capillary tilt angles"as wellas"guiding"is just nominal character of the guiding effect.Relationship between the transmission rate and the capillary tilt angles can befitted by Gaussion-type function.We obtain the values of characteristic tilt angleψ_crepresentating the guiding ability of the capillries,and the results are compared withthe theory and that from others.The comparison shows that the adjustable parameter(Q_∞)/(C_e)in the theory equation varies with the materials,and that having no conductinglayers,as a different working form of the capillary membranes,exhibits stronger ionguiding ability with reproductivity of the experimental results to some extent.The experimental results also show that the angular widths of the emerging ionbeams fluctuate with the tilt angles of capillary membrane.The theory basicallydescribes the relationship between the angular widths and the insulating materials aswell as the ionic values of (E_p)/q.The experiments find strong correlativity of the directions with the widths of theemerging beams.We propose that the angular widths of the emerging beams are theaccumulative results of continuous variations of the emerging directions,and longdischarging time of insulators is the reason for the observed correlativity.