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先進プラズマ研究開発

Over View of Neutron Diagnostics

掲載日:2018年12月26日更新
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Neutron monitor

[Objectives] Measurement of the total neutron emission rate.
[Detectors] U235 and U238 fission chambers  
[Position] P-3, P-7 and P-13 sections, in front of horizontal ports.


Neutron fluctuation monitor

[Objectives] Measurement of the neutron emission fractuation for MHD study.
[Detectors] Plastics scintillator detector in current mode.
[Position] P-8 sections, in front of horizontal port.


14 MeV neutron detectors

[Objectives] Measurement of the 14 MeV neutron emission rate for triton burn-up study.
[Detectors] Scintillating fiber detectors from Los Alamos National Laboratory.
[Position] 3 channels in front of the horizontal port of P-9 section
  1 channel in front of the horizontal port of P-8 section


Neutron activation measurement
[Objectives] Shot-integrated measurement of the total and 14 MeV neutron yield.

[Objectives] Shot-integrated measurement of the total and 14 MeV neutron yield.
[Method] Metal foil is tranfered to the irradiation point in side the vacuum vessel by a pneumatic tube. After the shot, the activation gamma is measured by the High Purity Ge detector.
[Position] P-15 sections, in the horizontal port.


Neutron spectrometers

[Objectives] Measurement of the DD neutron spectra.
[Detectors] Gridded He-3 ionization chamber
  NE213 liquid scintillator detector
[Position] Basement under the U2 port of P-10 section.

Arrangement of neutron diagnostics on JT-60

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