Improved C− efficiency and ion beam currents by modifying SNICS cathode material

Date

2019

Authors

Hlavenka, Joshua D.
Abrams, Henry
Roberts, Mark L.
Longworth, Brett E.
Fallon, Stewart

Journal Title

Journal ISSN

Volume Title

Publisher

Elsevier

Abstract

We investigated the possibility of increasing the 14C 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 μg of Oxalic Acid I (OX-I) and ran them to exhaustion. 12C beam currents, 14C counts, and graphite weight were used to determine ion source efficiency.

Description

Keywords

Citation

Source

Nuclear Instruments and Methods in Physics Research: Section B

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1016/j.nimb.2018.11.015

Restricted until

2037-12-31