Objectives
Measure energy spectrum of charge-exchange neutral particles of energetic alpha particle and hydrogen isotopes (H, D, T) emitted from the plasma.
Detectors, Diagnostic Method
Energetic neutral particles entering the analyzer are ionized by stripping in a thin carbon foil. The energy and mass of secondary ions are resolved by a combination of magnetic and electrostatic fields (E//B type). Secondary ions are measured with detectors consisting of CsI(Tl) scintillators each connected to a photomultiplier tube (PMT).
Two analyzers have been installed in a vertical and tangential direction.
Specification
| Vertical analyzer | Tangential analyzer | ||
| -Maximum energy | : | 4 MeV for α 2 MeV for H |
4 MeV for α 4 MeV for H |
| -Energy ratio | : | 4 | 3.85 |
| -Number of detectors | : | 8 | 8ch × 2 arrays |
| -Scintillator thickness | : | 10 mm | 2-23 mm |
| -Energy resolution | : | 6-11% | 6-11% |
| -Position | : | P-12 section | P-8 section |
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Tangential analyzer |
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Vertical analyzer |
Development, installation and commissioning under the collaboration between JAERI and the Ioffe Institute, Russia.
Reference
(1) Y. Kusama et al., "Charge-exchange neutral particle measurement in MeV energy range on JT-60U", Rev. Sci. Instrum. 66(1) 339(1995).