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Cs Feed Tests and Emittance Measurements on a Modified MC-SNICS Ion Source for Radiocarbon AMS

Published online by Cambridge University Press:  18 July 2016

John Southon ,
Guaciara dos Santos  and
Baoxi Han
John Southon*
Affiliation:
Department of Earth System Science, University of California, Irvine, California 92697-3100, USA
Guaciara dos Santos
Affiliation:
Department of Earth System Science, University of California, Irvine, California 92697-3100, USA
Baoxi Han
Affiliation:
Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA
*
Corresponding author: Email: jsouthon@uci.edu
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Abstract

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We report on 2 recent developments in an ongoing program of characterizing and improving the National Electrostatics Corp. (NEC) MC-SNICS ion source at University of California (UC) Irvine's Keck AMS laboratory. First, we have investigated the possibility of modifying a large-body (134-sample) MC-SNICS to incorporate the UC Irvine Cs oven and vacuum-insulated Cs feed tube, which provide better confinement of Cs than the standard NEC setup. In our 40-sample source, the feed tube enters the source housing directly below the ionizer assembly. This area cannot be accessed for machining on the 134-sample source, but we have successfully tested a modified geometry where the delivery tube enters the body via the source end flange. Second, we recently installed a second beam profile monitor in the injection line of our spectrometer to allow us to make online emittance measurements. At full output (150 μA of C− at 55 keV), the emittance of our source at 8 kV sputtering voltage is approximately 40π mm mrad.

Information

Type
Articles
Information
Radiocarbon , Volume 49 , Issue 2 , 2007 , pp. 301 - 306
Copyright
Copyright © 2007 by the Arizona Board of Regents on behalf of the University of Arizona 

References

Boers, JE. 2001. Code PBGUNS 5.04, Thunderbird Simulations. 626 Bradfield Drive, Garland, Texas 75042-6005, USA.Google Scholar
Norton, GA. 1992. Multi-cathode SNICS ion source. In: Benson, J, Rowton, L, Tesmer, J, Darling, R, editors. Proceedings of the 25th Symposium of North Eastern Accelerator Personnel (SNEAP). Santa Fe, New Mexico, USA, 16–19 October 1991. Singapore: World Scientific, p 295–8.Google Scholar
Southon, JR, Roberts, ML. 2000. Ten years of sourcery at CAMS/LLNL – evolution of a Cs ion source. Nuclear Instruments and Methods in Physics Research B 172(1–4):257–61.Google Scholar
Southon, JR, Santos, GM. 2004. Ion source development at the KCCAMS facility, University of California, Irvine. Radiocarbon 46(1):33–9.Google Scholar
Southon, JR, Santos, GM. 2007. Life with MC-SNICS. Part II: further ion source development at the Keck Carbon Cycle AMS facility. Nuclear Instruments and Methods in Physics Research B 259(1):88–93.Google Scholar
Southon, JR, Santos, GM, Druffel-Rodriguez, K, Druffel, E, Trumbore, S, Xu, X, Griffin, S, Ali, S, Mazon, M. 2004. The Keck Carbon Cycle AMS Laboratory, University of California, Irvine: initial operation and a background surprise. Radiocarbon 46(1):41–9.Google Scholar
von Reden, KF, McNichol, AP, Pearson, A, Schneider, RJ. 1998. 14C AMS measurements of <100 μg samples with a high-current system. Radiocarbon 40(1):247–54.Google Scholar
von Reden, KF, Griffin, VS, Roberts, ML. 2005. Beam profile measurements and modeling calculations for a MC-SNICS source with spherical ionizer [abstract]. 10th International Conference on Accelerator Mass Spectrometry (AMS 10) Conference, Berkeley, California, USA, 5–10 September 2005.Google Scholar
Weisser, DC, Lobanov, NR, Hausladen, PA, Fifield, LK, Wallace, HJ, Tims, SG, Apushkinsky, EG. 2002. Novel matching lens and spherical ionizer for a cesium sputter ion source. Journal of Physics (Indian Academy of Sciences) 59(6):997–1006.Google Scholar