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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: [email protected]
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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.

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 

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