Author:
Prasad G V Ravi,Cherkinsky Alexander,Culp Randy
Abstract
ABSTRACTIt is known that 12C beam transmission through the accelerator decreases at high beam currents. This effect depends on machine design and varies across different types of AMS instruments. For beam currents of about 100 μA, the effect is small on the 500 kV tandem CAMS unit, whereas beam saturation is observed for similar high beam currents on the 250 kV SSAMS unit. While this effect is very evident for high 12C beam currents, we have also observed that even the 13C beam is found to suffer modest transmission loss with beam current. As a result, the 13C/12C ratio does not remain constant with beam current. By correcting for the effects of 12C beam saturation and decreased 13C transmission, we have obtained online δ13C values that are more accurate and precise at moderately high beam currents for SSAMS.
Publisher
Cambridge University Press (CUP)
Subject
General Earth and Planetary Sciences,Archeology
Cited by
1 articles.
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1. Identifying the sources of beam transmission loss of carbon isotopes;Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms;2023-02