The University of Arizona

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

X-L Zhao, A E Litherland, J Eliades, Y-C Fu, W E Kieser

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.

DOI: 10.2458/azu_js_rc.55.16269


Keywords


CaF3-; KF3-; Beam retardation; gas-filled RFQ; ISA; 41Ca AMS;

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