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

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

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


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 languageEnglish (US)
Pages (from-to)292-295
Number of pages4
JournalReview of Scientific Instruments
Issue number1
StatePublished - Jan 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Instrumentation


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