Speaker
Description
Positive Ion Mass Spectrometry (PIMS) represents an advanced methodology for radiocarbon dating, operating on principles distinct from those of Accelerator Mass Spectrometry (AMS). Current research mainly focuses on the miniaturization carbon ion source and high charge exchanging cell for a prototype PIMS system. At Peking University (PKU), several PIMS-related experiments have recently yielded promising results. First, a compact gas-fed 2.45 GHz Microwave Driven Ion Sources (MDISs) with an all-permanent-magnet design was developed and it already consistently generates more than 686 emA of C2+ in DC mode, demonstrating the robust high-charge carbon ion production required for PIMS. Second, a non-metallic gas charge exchange target was manufactured and its charge exchange efficiency reaches up to 6.1% for C2+ to C-, and a C- beam current of 19 μA was obtained. In addition, a 260 eμA C- beam at 45 kV is also obtained from C+ ions with a charge exchange efficiency of 7%. A novel analytical approach utilizing C+ ions for 14C measurement in PIMS was proposed and a patent based on C+ to C- has been authorized. A beam dynamics design for a future C-PIMS beamline was conducted to optimize its 14C transmission efficiency. The PIMS system occupies only an area of approximately 4.1 m×2.2 m, while substantially reducing operational costs.
| Classification | MC1: New developments and status reports |
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