E∥B energy-mass spectrograph for measurement of ions and neutral atoms

H. O. Funsten; D. J. McComas; E. E. Scime

doi:10.1063/1.1147824

E∥B energy-mass spectrograph for measurement of ions and neutral atoms

H. O. Funsten, D. J. McComas, E. E. Scime

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Abstract

Real-time measurement of plasma composition and energy is an important diagnostic in fusion experiments. The Thomson parabola spectrograph described here utilizes an electric field parallel to a magnetic field (E∥B) and a two-dimensional imaging detector to uniquely identify the energy-per-charge and mass-per-charge distributions of plasma ions. An ultrathin foil can be inserted in front of the E∥B filter to convert neutral atoms to ions, which are subsequently analyzed using the E∥B filter. Since helium exiting an ultrathin foil does not form a negative ion and hydrogen isotopes do, this spectrograph allows unique identification of tritium ions and neutrals even in the presence of a large background of ³He.

Original language	English (US)
Pages (from-to)	292-295
Number of pages	4
Journal	Review of Scientific Instruments
Volume	68
Issue number	1
DOIs	https://doi.org/10.1063/1.1147824
State	Published - Jan 1997
Externally published	Yes

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.1147824

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title = "E∥B energy-mass spectrograph for measurement of ions and neutral atoms",

abstract = "Real-time measurement of plasma composition and energy is an important diagnostic in fusion experiments. The Thomson parabola spectrograph described here utilizes an electric field parallel to a magnetic field (E∥B) and a two-dimensional imaging detector to uniquely identify the energy-per-charge and mass-per-charge distributions of plasma ions. An ultrathin foil can be inserted in front of the E∥B filter to convert neutral atoms to ions, which are subsequently analyzed using the E∥B filter. Since helium exiting an ultrathin foil does not form a negative ion and hydrogen isotopes do, this spectrograph allows unique identification of tritium ions and neutrals even in the presence of a large background of 3He.",

author = "Funsten, {H. O.} and McComas, {D. J.} and Scime, {E. E.}",

year = "1997",

month = jan,

doi = "10.1063/1.1147824",

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AU - Funsten, H. O.

AU - McComas, D. J.

AU - Scime, E. E.

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Y1 - 1997/1

N2 - Real-time measurement of plasma composition and energy is an important diagnostic in fusion experiments. The Thomson parabola spectrograph described here utilizes an electric field parallel to a magnetic field (E∥B) and a two-dimensional imaging detector to uniquely identify the energy-per-charge and mass-per-charge distributions of plasma ions. An ultrathin foil can be inserted in front of the E∥B filter to convert neutral atoms to ions, which are subsequently analyzed using the E∥B filter. Since helium exiting an ultrathin foil does not form a negative ion and hydrogen isotopes do, this spectrograph allows unique identification of tritium ions and neutrals even in the presence of a large background of 3He.

AB - Real-time measurement of plasma composition and energy is an important diagnostic in fusion experiments. The Thomson parabola spectrograph described here utilizes an electric field parallel to a magnetic field (E∥B) and a two-dimensional imaging detector to uniquely identify the energy-per-charge and mass-per-charge distributions of plasma ions. An ultrathin foil can be inserted in front of the E∥B filter to convert neutral atoms to ions, which are subsequently analyzed using the E∥B filter. Since helium exiting an ultrathin foil does not form a negative ion and hydrogen isotopes do, this spectrograph allows unique identification of tritium ions and neutrals even in the presence of a large background of 3He.

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E∥B energy-mass spectrograph for measurement of ions and neutral atoms

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