Improved C− efficiency and ion beam currents by modifying SNICS cathode material

Joshua D. Hlavenka; Henry Abrams; Mark L. Roberts; Brett E. Longworth; Stewart Fallon

doi:10.1016/j.nimb.2018.11.015

Improved C⁻ efficiency and ion beam currents by modifying SNICS cathode material

Joshua D. Hlavenka^*, Henry Abrams, Mark L. Roberts, Brett E. Longworth, Stewart Fallon

^*Corresponding author for this work

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

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Abstract

We investigated the possibility of increasing the ¹⁴C AMS efficiency and maximizing C⁻ beam currents by modifying sample cathode geometry and material. Previously, we reported results which showed an increase in C⁻ beam current and improved ionization efficiency when reducing the cathode sample well diameter from 1 mm to 0.75 mm and using zinc inserts, pressed into the aluminum cathode holder [4]. In this study we expand that effort by using cathodes with inserts made of Fe, Mo, Ni, Ti, Cu, and Zn. We pressed cathodes with 100 μg of Oxalic Acid I (OX-I) and ran them to exhaustion. ¹²C beam currents, ¹⁴C counts, and graphite weight were used to determine ion source efficiency.

Original language	English
Pages (from-to)	90-93
Number of pages	4
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	439
DOIs	https://doi.org/10.1016/j.nimb.2018.11.015
Publication status	Published - 15 Jan 2019

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title = "Improved C− efficiency and ion beam currents by modifying SNICS cathode material",

abstract = "We investigated the possibility of increasing the 14C AMS efficiency and maximizing C− beam currents by modifying sample cathode geometry and material. Previously, we reported results which showed an increase in C− beam current and improved ionization efficiency when reducing the cathode sample well diameter from 1 mm to 0.75 mm and using zinc inserts, pressed into the aluminum cathode holder [4]. In this study we expand that effort by using cathodes with inserts made of Fe, Mo, Ni, Ti, Cu, and Zn. We pressed cathodes with 100 μg of Oxalic Acid I (OX-I) and ran them to exhaustion. 12C beam currents, 14C counts, and graphite weight were used to determine ion source efficiency.",

keywords = "Cathode, Efficiency, Ion source, SNICS",

author = "Hlavenka, {Joshua D.} and Henry Abrams and Roberts, {Mark L.} and Longworth, {Brett E.} and Stewart Fallon",

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T1 - Improved C− efficiency and ion beam currents by modifying SNICS cathode material

AU - Hlavenka, Joshua D.

AU - Abrams, Henry

AU - Roberts, Mark L.

AU - Longworth, Brett E.

AU - Fallon, Stewart

PY - 2019/1/15

Y1 - 2019/1/15

N2 - We investigated the possibility of increasing the 14C AMS efficiency and maximizing C− beam currents by modifying sample cathode geometry and material. Previously, we reported results which showed an increase in C− beam current and improved ionization efficiency when reducing the cathode sample well diameter from 1 mm to 0.75 mm and using zinc inserts, pressed into the aluminum cathode holder [4]. In this study we expand that effort by using cathodes with inserts made of Fe, Mo, Ni, Ti, Cu, and Zn. We pressed cathodes with 100 μg of Oxalic Acid I (OX-I) and ran them to exhaustion. 12C beam currents, 14C counts, and graphite weight were used to determine ion source efficiency.

AB - We investigated the possibility of increasing the 14C AMS efficiency and maximizing C− beam currents by modifying sample cathode geometry and material. Previously, we reported results which showed an increase in C− beam current and improved ionization efficiency when reducing the cathode sample well diameter from 1 mm to 0.75 mm and using zinc inserts, pressed into the aluminum cathode holder [4]. In this study we expand that effort by using cathodes with inserts made of Fe, Mo, Ni, Ti, Cu, and Zn. We pressed cathodes with 100 μg of Oxalic Acid I (OX-I) and ran them to exhaustion. 12C beam currents, 14C counts, and graphite weight were used to determine ion source efficiency.

KW - Cathode

KW - Efficiency

KW - Ion source

KW - SNICS

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SN - 0168-583X

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JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

ER -

Improved C⁻ efficiency and ion beam currents by modifying SNICS cathode material

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