RECENT STATUS OF NEUTRON AND GAMMA-RAY MEASUREMENTS FOR DIAGNOSTICS IN JAPAN Kentaro OCHIAI JAPAN ATOMIC ENERGY AGENCY FNS.

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Presentation transcript:

RECENT STATUS OF NEUTRON AND GAMMA-RAY MEASUREMENTS FOR DIAGNOSTICS IN JAPAN Kentaro OCHIAI JAPAN ATOMIC ENERGY AGENCY FNS

OUTLINE  Neutron measurement in JAEA/FNS Triplet coincidence TOF spectrometer Double crystal TOF spectrometer (Sasao) PPAC instruments Flash ADC system (Ishikawa) Stilbene detector (Ishikawa) Cherenkov detector (V.Yury)  Gamma-ray measurement for fast ions in JAEA/FNS D( ,  ) 6 Li gamma-ray Activation method for leakage a particle

FNS Triplet coincidence spectrometer Some experiment of neutron spectroscopy is currently carried out in Japan (JAEA/FNS). In order to measure tritium burning ratio (DD/DT) and high resolution neutron spectrum, JAEA/FNS and Naogoya Univ. has conducted the triplet coincidence spectroscopy Principle of triplet coincidence methodApparatus of coincident measurement

FNS Result and Future works N. Naoi et al. （ Nagoya university ) will present the study on HTPD2006 May We have obtained the energy resolution within 6% using triplet coincidence. In order to obtain the resolution within 2.5%, Some improvement will be done.

FNS Double crystal TOF spctroscopy First Detector Second Detector Prof. M. Sasao will mention the detail of the experiment. So, here the present status of second detector for JT-60 diagnostics are presented.

FNS Result of second detector property We obtained the TOF spectrum the second detector using by 9 Be-d neutron. The efficiency, resolution and gamma effect will be obtained near D-D neutron energy. Gamma-flash (time~0sec) 4.16-MeV neutron 0.9-MeV neutron Gamma 3.44-MeV neutron Neutron spectrum of second detector using by 9 Be-d neutrons 2.22 and 2.59-MeV

FNS PPAC instruments Experiment on an AVF-cyclotron in Tohoku-Univ. Research of rise time of Parallel Plate Avalanche Counter (PPAC) is conducted using by heavy ion beam (AVF- Cyclotoron in Tohoku-Univ.)

FNS Result (PPAC) We obtained the rise time within 3nsec. Some improvement is needed to be within 1 nsec

FNS D(,) 6 Li 2.18MeV gamma-ray ITER D-T plasma ~ 500m 3  5 x photon/sec Target C 2 D 2 Kobe university Tandem Van de Graaff accelerator, Pelletron 5SDH-2, +15 line Nuclear properties of D( ,  ) 6 Li 2.18MeV gamma-ray was researched due to the diagnostics of high energetic  -particle.

FNS Result (D(,) 6 Li 2.18MeV gamma-ray) We obviously obtained the photo peak of the gamma and energy dependence. It was found that energy dependency was different from the past data. Photo peak of D(a,g)6Li 2.18MeV gamma-ray Energy dependency of gamma yield

FNS Activation method for lost  particle Irradiated CaF 2 sample 19 F+a→n + 22 Na 1274 keV 511keV 3.5-MeV He ++ implantation K-40 Future works Property of Irradiation of DT neutron Property of Irradiation of fast ions Experiment in JT-60 How to insert the CaF2 into ITER Activation method by 19 F( ,n) 22 Na reaction has been started to measure lost  particle