TY - JOUR T1 - Improved C− efficiency and ion beam currents by modifying SNICS cathode material JF - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Y1 - 2019 A1 - Hlavenka, Joshua D. A1 - Abrams, Henry A1 - Roberts, Mark L. A1 - Longworth, Brett E. A1 - Fallon, Stewart KW - Cathode KW - Efficiency KW - Ion source KW - SNICS AB - We investigated the possibility of increasing the C-14 AMS efficiency and maximizing C- beam currents by modifying sample cathode geometry and material. Previously, we reported results which showed an increase in C- beam current and improved ionization efficiency when reducing the cathode sample well diameter from 1 mm to 0.75 mm and using zinc inserts, pressed into the aluminum cathode holder [4]. In this study we expand that effort by using cathodes with inserts made of Fe, Mo, Ni, Ti, Cu, and Zn. We pressed cathodes with 100 mu g of Oxalic Acid I (OX-I) and ran them to exhaustion. C-12 beam currents, C-14 counts, and graphite weight were used to determine ion source efficiency. VL - 439 UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000455693100015 ER -