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A Study of KF3 Attenuation in an RFQ Gas Cell for 41Ca AMS

Published online by Cambridge University Press:  09 February 2016

X-L Zhao*
Affiliation:
Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, ON, K1N 6N5, Canada
A E Litherland
Affiliation:
IsoTrace Laboratory, University of Toronto, 60 St. George St., Toronto, ON, M5S 1A7, Canada
J Eliades
Affiliation:
IsoTrace Laboratory, University of Toronto, 60 St. George St., Toronto, ON, M5S 1A7, Canada
Y-C Fu
Affiliation:
Institute of Earth Environment, Chinese Academy of Sciences, No. 10 Fenghui South Road, Hi-Tech Zone, Xi'an 710075, China
W E Kieser
Affiliation:
Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, ON, K1N 6N5, Canada
*
2Corresponding author. xiaolei.zhao@uottawa.ca.

Abstract

Guided by simulations using SIMION 8.1, a series of modifications were made to an experimental version of an Isobar Separator for Anions (ISA). The resulting improved version of the ISA provides a means of re-energizing the ions after they are cooled by gas collisions as they pass through the gas-filled radiofrequency quadrupoles (RFQ), and also provides higher transmission efficiencies. Reinvestigation of the separation of CaF3 and KF3 with this refined apparatus resulted in a better balance between isobar suppression and analyte transmission. KF3 was attenuated at eV energies by 4 orders of magnitude while 40% transmission of CaF3 was retained, for a 20keV CaF3 beam of Φ2mm and ±12mr. These results advance the possibility of an efficient small ISA-AMS system for both cosmogenic and medical applications of 41Ca.

Type
Articles
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

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