Han Baoxi

No Thumbnail Available
Last Name
Han
First Name
Baoxi
ORCID

Filters

2007 - 2010 3
2 1
3
Reset filters

Settings

Search Results

Now showing 1 - 3 of 3
  • Article
    Cs feed tests and emittance measurements on a modified MC-SNICS ion source for radiocarbon AMS
    (Dept. of Geosciences, University of Arizona, 2007-11) Southon, John R. ; Santos, Guaciara M. ; Han, Baoxi
    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.
  • Preprint
    Progress on a gas-accepting ion source for continuous-flow accelerator mass spectrometry
    ( 2007-02) Roberts, Mark L. ; Schneider, Robert J. ; von Reden, Karl F. ; Wills, J. S. C. ; Han, Baoxi ; Hayes, John M. ; Rosenheim, Brad E. ; Jenkins, William J.
    A gas-accepting microwave-plasma ion source is being developed for continuous-flow Accelerator Mass Spectrometry (AMS). Characteristics of the ion source will be presented. Schemes for connecting a gas or liquid chromatograph to the ion source will also be discussed.
  • Article
    A high-performance 14C accelerator mass spectrometry system
    (Dept. of Geosciences, University of Arizona, 2010-08) Roberts, Mark L. ; Burton, Joshua R. ; Elder, Kathryn L. ; Longworth, Brett E. ; McIntyre, Cameron P. ; von Reden, Karl F. ; Han, Baoxi ; Rosenheim, Brad E. ; Jenkins, William J. ; Galutschek, Ernst ; McNichol, Ann P.
    A new and unique radiocarbon accelerator mass spectrometry (AMS) facility has been constructed at the Woods Hole Oceanographic Institution. The defining characteristic of the new system is its large-gap optical elements that provide a larger-than-standard beam acceptance. Such a system is ideally suited for high-throughput, high-precision measurements of 14C. Details and performance of the new system are presented.