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Related Experiment Video

Updated: May 8, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Preparing an Isotopically Pure ²²⁹Th Ion Beam for Studies of ^229mTh

Published on: May 3, 2019

Carbon ion stripper for NSTRI tandem accelerator.

M Mohseni Kejani^1,2, F Ghasemi³, F Abbasi Davani¹

¹Department of Radiation Application, Faculty of Nuclear Engineering, Shahid Beheshti University, P.O. Box 19839-69411, Tehran, Iran.

Scientific Reports

|May 6, 2026

Summary

Researchers optimized a stripper section for a carbon ion beam accelerator, achieving efficient charge exchange for Accelerator Mass Spectrometry (AMS). This design enhances radiocarbon dating accuracy by improving isotopic discrimination in carbon measurements.

Keywords:

charge exchange interaction equilibrium thickness gas stripper radiocarbon dating tandem technique

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Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments

Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments

Published on: January 20, 2022

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Last Updated: May 8, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Preparing an Isotopically Pure ²²⁹Th Ion Beam for Studies of ^229mTh

Published on: May 3, 2019

Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments

Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments

Published on: January 20, 2022

Area of Science:

Nuclear Physics and Engineering
Accelerator Science and Technology
Analytical Chemistry

Background:

The Nuclear Science and Technology Research Institute (NSTRI) is developing a 1.7 MV tandem accelerator for Accelerator Mass Spectrometry (AMS).
A critical component for AMS is the stripper section, responsible for optimizing ion charge states.
This study focuses on the design of a stripper section specifically for carbon ion beams.

Purpose of the Study:

To design and optimize a stripper section for a carbon ion beam within a 1.7 MV tandem accelerator.
To achieve efficient charge exchange and equilibrium thickness for various carbon charge states.
To validate the design through simulations and experimental measurements, considering isotopic mass effects.

Main Methods:

Derived interaction cross-sections for 14 charge state transitions ((q, q+1) and (q, q-1)).
Introduced an optimal geometry and calculated charge exchange efficiency based on gas throughput.
Validated simulation results with experimental pressure measurements and compared charge-state fractions with existing data.

Main Results:

Achieved an equilibrium thickness of 2.3 × 10¹⁶ cm^-2 at 9 SCCM gas throughput.
Reported ¹⁴C/¹²C stripping ratios of 1.22, 1.01, and 0.89 for charge states 1+, 2+, and 3+ respectively.
Demonstrated close agreement between simulated and experimental results, validating the optimized stripper design.

Conclusions:

The optimized stripper section geometry ensures efficient charge exchange equilibrium for carbon ions.
The design accounts for isotopic mass effects, crucial for accurate AMS-based radiocarbon measurements.
The compact design reduces overall length by approximately two-thirds compared to conventional strippers, enhancing practicality.