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先進プラズマ研究開発

Gamma-ray pluse height analysis

掲載日:2018年12月26日更新
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Objectives

To measure gamma-ray spectrum originated from nuclear reactions between fast ions and impurity ions.
[Detectors, Diagnostic Method]
Time resolved gamma-ray spectra in an energy range of 0.5 to 20 MeV are measured by a NaI(Tl) scintillator surround by 50 cm thick polyethylene and 30 cm thick lead shield.
Following gamma-rays originated from inelastic collisions have been measured in JT-60U ICRF experiments to identify energy distribution of MeV-energy protons.

(1) p + 20Ne --> p + 20Ne + gamma (1.6MeV)
(2) p + 11B --> p + 11B + gamma (2.1MeV)
(3) p + 12C --> p + 12C + gamma (4.4MeV)

Specifications

・Time resolusion : 50 ms (spectra), 1 ms (count)
・Spatial resolution : about 30 cm at plasma center (depends on collimator)
・Energy range : 0.5 - 20 MeV (256 channel)
・Position : P-18 section, U2-2a port
・Detector : NaI(Tl) ,12.7 cm in diameter and 12.7 cm in length

Fig

Reference

(1) T.Kondoh et al., "Gamma-ray measurements in JT-60U ICRF heated plasma", Journal of Plasma and Fusion Research, Vol 72, No.12 1397(1996).

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