Investigation of gas stripping at 4.1 MeV for high mass negative ions

M. A.C. Hotchkis; D. Child; D. Fink; V. Levchenko; A. Wallner

doi:10.1016/j.nimb.2012.01.019

Investigation of gas stripping at 4.1 MeV for high mass negative ions

M. A.C. Hotchkis^*, D. Child, D. Fink, V. Levchenko, A. Wallner

^*Corresponding author for this work

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

3 Citations (Scopus)

Abstract

We have used a tandem accelerator to measure charge state distributions at 4.1 MeV for negative ions ranging from carbon to uranium oxide passing through the gases helium, argon and xenon. The gas density was varied over a wide range to observe the onset of equilibrium stripping conditions. Using a 12° electrostatic deflector after the accelerator, charge states from 1+ to 8+ have been measured. For carbon, the charge state is seen to strip progressively from a low charge of around 1+ towards equilibrium with increasing gas thickness. However, for all the other ions, there is a high probability of multiple electron loss in single collisions with the gas, leading to mean charge states greater than 2 even at very low gas stripper pressure. This effect is observed to be gas-independent.

Original language	English
Pages (from-to)	387-391
Number of pages	5
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	294
DOIs	https://doi.org/10.1016/j.nimb.2012.01.019
Publication status	Published - Jan 2013
Externally published	Yes

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title = "Investigation of gas stripping at 4.1 MeV for high mass negative ions",

abstract = "We have used a tandem accelerator to measure charge state distributions at 4.1 MeV for negative ions ranging from carbon to uranium oxide passing through the gases helium, argon and xenon. The gas density was varied over a wide range to observe the onset of equilibrium stripping conditions. Using a 12° electrostatic deflector after the accelerator, charge states from 1+ to 8+ have been measured. For carbon, the charge state is seen to strip progressively from a low charge of around 1+ towards equilibrium with increasing gas thickness. However, for all the other ions, there is a high probability of multiple electron loss in single collisions with the gas, leading to mean charge states greater than 2 even at very low gas stripper pressure. This effect is observed to be gas-independent.",

keywords = "AMS, Charge state distributions, Multiply-charged ions, Tandem accelerators",

author = "Hotchkis, {M. A.C.} and D. Child and D. Fink and V. Levchenko and A. Wallner",

year = "2013",

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doi = "10.1016/j.nimb.2012.01.019",

language = "English",

volume = "294",

pages = "387--391",

journal = "Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms",

issn = "0168-583X",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Investigation of gas stripping at 4.1 MeV for high mass negative ions

AU - Hotchkis, M. A.C.

AU - Child, D.

AU - Fink, D.

AU - Levchenko, V.

AU - Wallner, A.

PY - 2013/1

Y1 - 2013/1

N2 - We have used a tandem accelerator to measure charge state distributions at 4.1 MeV for negative ions ranging from carbon to uranium oxide passing through the gases helium, argon and xenon. The gas density was varied over a wide range to observe the onset of equilibrium stripping conditions. Using a 12° electrostatic deflector after the accelerator, charge states from 1+ to 8+ have been measured. For carbon, the charge state is seen to strip progressively from a low charge of around 1+ towards equilibrium with increasing gas thickness. However, for all the other ions, there is a high probability of multiple electron loss in single collisions with the gas, leading to mean charge states greater than 2 even at very low gas stripper pressure. This effect is observed to be gas-independent.

AB - We have used a tandem accelerator to measure charge state distributions at 4.1 MeV for negative ions ranging from carbon to uranium oxide passing through the gases helium, argon and xenon. The gas density was varied over a wide range to observe the onset of equilibrium stripping conditions. Using a 12° electrostatic deflector after the accelerator, charge states from 1+ to 8+ have been measured. For carbon, the charge state is seen to strip progressively from a low charge of around 1+ towards equilibrium with increasing gas thickness. However, for all the other ions, there is a high probability of multiple electron loss in single collisions with the gas, leading to mean charge states greater than 2 even at very low gas stripper pressure. This effect is observed to be gas-independent.

KW - AMS

KW - Charge state distributions

KW - Multiply-charged ions

KW - Tandem accelerators

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U2 - 10.1016/j.nimb.2012.01.019

DO - 10.1016/j.nimb.2012.01.019

M3 - Article

AN - SCOPUS:84870951999

SN - 0168-583X

VL - 294

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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 -

Investigation of gas stripping at 4.1 MeV for high mass negative ions

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