Charge-exchange neutral particle measurement in MeV energy range on JT-60U

Y. Kusama, M. Nemoto, M. Satoh, Y. Tsukahara, K. Tobita, H. Takeuchi, S. Petrov, V. Afanassiev, S. Kozlovskij, A. Kislyakov, M. Petrov

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1 Citation (Scopus)


A charge-exchange neutral particle analyzer for the measurement of the MeV energy range ions produced by nuclear fusion or radio frequency heating has been developed and installed in JT-60U. Neutral particles entering the analyzer are ionized with a carbon foil of thickness 400 Å. The energy and mass of the stripped ions are resolved by magnetic and electrostatic fields (E∥B type). The analyzer has eight CsI(Tl) scintillator detectors. The energy range is 0.5-4 MeV for 4He0, the dynamic range is 4.08 and the energy resolution is 6%-11%. The detection efficiency for 4He0 with energy above 1 MeV is 30%-40%. A pulse height analysis (PHA) with 16 channels was adopted to distinguish particle signals from noise arising from neutrons, γ rays and optical lights emitted by JT-60U plasmas. The validity of the PHA was confirmed in a calibration experiment using a neutron source and in a high power heating experiment in JT-60U.

Original languageEnglish
Pages (from-to)339-341
Number of pages3
JournalReview of Scientific Instruments
Issue number1
Publication statusPublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation


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