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 |
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).