Electromagnetic field modeling and ion optics calculations for a continuous-flow AMS system

B. X. Han; K. F. von Reden; M. L. Roberts; R. J. Schneider; J. M. Hayes; W. J. Jenkins

doi:10.1016/j.nimb.2007.01.224

Electromagnetic field modeling and ion optics calculations for a continuous-flow AMS system

B. X. Han, K. F. von Reden, M. L. Roberts, R. J. Schneider, J. M. Hayes, W. J. Jenkins

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

A continuous-flow ¹⁴C AMS (CFAMS) system is under construction at the NOSAMS facility. This system is based on a NEC Model 1.5SDH-1 0.5 MV Pelletron accelerator and will utilize a combination of a microwave ion source (MIS) and a charge exchange canal (CXC) to produce negative carbon ions from a continuously flowing stream of CO₂ gas. For high-efficiency transmission of the large emittance, large energy-spread beam from the ion source unit, a large-acceptance and energy-achromatic injector consisting of a 45° electrostatic spherical analyzer (ESA) and a 90° double-focusing magnet has been designed. The 45° ESA is rotatable to accommodate a 134-sample MC-SNICS as a second ion source. The high-energy achromat (90° double focusing magnet and 90° ESA) has also been customized for large acceptance. Electromagnetic field modeling and ion optics calculations of the beamline were done with Infolytica MagNet, ElecNet, and Trajectory Evaluator. PBGUNS and SIMION were used for the modeling of ion source unit.

Original language	English
Pages (from-to)	111-117
Number of pages	7
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	259
Issue number	1
DOIs	https://doi.org/10.1016/j.nimb.2007.01.224
State	Published - Jun 2007
Externally published	Yes

Funding

This work is supported by the National Science Foundation as a Major Research Instrumentation project under award number OCE-0321045 and cooperative agreement number OCE-0228996.

Funders	Funder number
National Science Foundation	OCE-0228996, OCE-0321045

Keywords

Computer modeling
Continuous-flow AMS
Ion optics
Microwave ion source

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10.1016/j.nimb.2007.01.224

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title = "Electromagnetic field modeling and ion optics calculations for a continuous-flow AMS system",

abstract = "A continuous-flow 14C AMS (CFAMS) system is under construction at the NOSAMS facility. This system is based on a NEC Model 1.5SDH-1 0.5 MV Pelletron accelerator and will utilize a combination of a microwave ion source (MIS) and a charge exchange canal (CXC) to produce negative carbon ions from a continuously flowing stream of CO2 gas. For high-efficiency transmission of the large emittance, large energy-spread beam from the ion source unit, a large-acceptance and energy-achromatic injector consisting of a 45° electrostatic spherical analyzer (ESA) and a 90° double-focusing magnet has been designed. The 45° ESA is rotatable to accommodate a 134-sample MC-SNICS as a second ion source. The high-energy achromat (90° double focusing magnet and 90° ESA) has also been customized for large acceptance. Electromagnetic field modeling and ion optics calculations of the beamline were done with Infolytica MagNet, ElecNet, and Trajectory Evaluator. PBGUNS and SIMION were used for the modeling of ion source unit.",

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AU - von Reden, K. F.

AU - Roberts, M. L.

AU - Schneider, R. J.

AU - Hayes, J. M.

AU - Jenkins, W. J.

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AB - A continuous-flow 14C AMS (CFAMS) system is under construction at the NOSAMS facility. This system is based on a NEC Model 1.5SDH-1 0.5 MV Pelletron accelerator and will utilize a combination of a microwave ion source (MIS) and a charge exchange canal (CXC) to produce negative carbon ions from a continuously flowing stream of CO2 gas. For high-efficiency transmission of the large emittance, large energy-spread beam from the ion source unit, a large-acceptance and energy-achromatic injector consisting of a 45° electrostatic spherical analyzer (ESA) and a 90° double-focusing magnet has been designed. The 45° ESA is rotatable to accommodate a 134-sample MC-SNICS as a second ion source. The high-energy achromat (90° double focusing magnet and 90° ESA) has also been customized for large acceptance. Electromagnetic field modeling and ion optics calculations of the beamline were done with Infolytica MagNet, ElecNet, and Trajectory Evaluator. PBGUNS and SIMION were used for the modeling of ion source unit.

KW - Computer modeling

KW - Continuous-flow AMS

KW - Ion optics

KW - Microwave ion source

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Electromagnetic field modeling and ion optics calculations for a continuous-flow AMS system

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