recent status of neutron and gamma-ray measurements for diagnostics in japan kentaro ochiai japan...
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RECENT STATUS OF NEUTRON AND GAMMA-RAY MEASUREMENTS FOR DIAGNOSTICS IN JAPAN
Kentaro OCHIAI
JAPAN ATOMIC ENERGY AGENCY
FNS
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(,)6Li 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 method Apparatus of coincident measurement
FNS
Result and Future works
N. Naoi et al. ( Nagoya university ) will present the study on HTPD2006 May. 2006
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.
0 10 200
0.5
1
Energy (MeV)
Cou
nts
(a.u
.)
Al Light Pipe (FWHM=10.5 %)
Acrylic Light Guide (FWHM=6.0 %)
FNS
Double crystal TOF spctroscopy
First Detector
Second Detector
Second Detector
TFA
CFD
FAN-in/out
GDG
TFA TFA
CFDD CFDD
MT
TACstop start
Delay: ~ 1nsWidth: ~ 100 ns
Range: 1 s
× 8 × 8
Lower level
0.2 V
PMT 1 PMT 2
FNS 350-keV deuteronpulsed beam 3nsec
9Be(d,n) reaction
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 9Be-d neutron. The efficiency, resolution and gamma effect will be obtained near D-D neutron energy.
TAC (neutron & -ray)
0100020003000400050006000700080009000
10000
350 450 550 650 750 850channel
cou
nts
/ch
an
ne
l
Gamma-flash(time~0sec)
4.16-MeV neutron
0.9-MeVneutron Gamma
3.44-MeV neutron
Neutron spectrum of second detector using by 9Be-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(,)6Li 2.18MeV gamma-ray
ITER D-T plasma ~ 500m3
5 x 1011 photon/sec
Target C2D2
Kobe university Tandem Van de Graaff accelerator, Pelletron 5SDH-2, +15 line
Nuclear properties of D(,)6Li 2.18MeV gamma-ray was researched due to the diagnostics of high energetic -particle.
FNS
Result (D(,)6Li 2.18MeV gamma-ray)
2160 2180 2200 2220 2240 2260 2280 2300
0
20
40
60
80
100
Yie
lds
co
un
ts/k
eV
/mC
2160 2180 2200 2220 2240 2260 2280 2300
0
20
40
60
80
100
2160 2180 2200 2220 2240 2260 2280 2300
0
200
400
600
800
1000
2160 2180 2200 2220 2240 2260 2280 23000
2000
4000
6000
8000
10000
E energy keV
E= 2.25MeV
E = 3.00MeV
E = 3.50MeV
E = 4.00MeV
2222~2237
2.230~2248
2.255~2234
2.239~2260
E0=21862160 2180 2200 2220 2240 2260 2280 2300
0
20
40
60
80
100
Yie
lds
co
un
ts/k
eV
/mC
2160 2180 2200 2220 2240 2260 2280 2300
0
20
40
60
80
100
2160 2180 2200 2220 2240 2260 2280 2300
0
200
400
600
800
1000
2160 2180 2200 2220 2240 2260 2280 23000
2000
4000
6000
8000
10000
E energy keV
E= 2.25MeV
E = 3.00MeV
E = 3.50MeV
E = 4.00MeV
2222~2237
2.230~2248
2.255~2234
2.239~2260
E0=21862160 2180 2200 2220 2240 2260 2280 2300
0
20
40
60
80
100
Yie
lds
co
un
ts/k
eV
/mC
2160 2180 2200 2220 2240 2260 2280 2300
0
20
40
60
80
100
2160 2180 2200 2220 2240 2260 2280 2300
0
200
400
600
800
1000
2160 2180 2200 2220 2240 2260 2280 23000
2000
4000
6000
8000
10000
E energy keV
E= 2.25MeV
E = 3.00MeV
E = 3.50MeV
E = 4.00MeV
2222~2237
2.230~2248
2.255~2234
2.239~2260
E0=2186
Yie
lds
coun
ts/k
eV/m
C
MeV186.2,
cos100
E
c
vEE Li
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-rayEnergy dependency of gamma yield
FNS
Activation method for lost particle
Irradiated CaF2 sample
19F+a→n + 22Na
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 19F(,n)22Na reaction has been started to measure lost particle