JAEA-Conf 2011-002 - 日本原子力研究開発機構

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JAEA-Conf 2011-002
JAEA-Conf 2011-002 36. Evaluation of gamma-ray and neutron energy in the IFMIF/EVEDA accelerator building Hiroki TAKAHASHI 1* , Sunao MAEBARA 2 , Hironao SAKAKI 3 , Keiichi HIRABAYASHI 4 , Kosuke HIDAKA 4 , Nobuhiro SHIGYO 4 , Yukinobu WATANABE 5 , Kenshi SAGARA 6 1. Directorates of Fusion Energy Research, Japan Atomic Energy Agency (JAEA), Rokkasho-mura, Aomori 039-3212, Japan 2. Directorates of Fusion Energy Research, JAEA, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan 3. Photo Medical Research Center, JAEA, Kizugawa Kyoto 619-0215, Japan 4. Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Fukuoka 819-0395, Japan 5. Department of Advanced Energy Engineering Science, Kyushu University, Fukuoka 816-8580, Japan 6. Department of Physics, Kyushu University, Fukuoka 812-8581, Japan *E-mail: takahashi.hiroki@jaea.go.jp The Engineering Validation of the IFMIF/EVEDA accelerator prototype, up to 9MeV by employing the deuteron beam of 125mA, is planning at the BA site in Rokkasho. The design of this area monitoring system, comprising of Si semiconductors and ionization chambers for covering wide energy spectrum of gamma-rays and 3 He counters for neutrons, is now in progress. To establish the applicability, photon and neutron energy has to be suppressed to the detector ranges of 1.5MeV and 15MeV, respectively. For this purpose, the reduction of neutron and photon energies throughout shield of water and concrete layer is evaluated by PHITS code, using the experimental data of neutron source spectra. As the first step, simple sphere model is used and it is found that the photon energy range exceeded over 10MeV by water and concrete shielding material only. In this article, in order to decrease the maximum photon energy, a model with iron layer is evaluated. 1. Introduction International Fusion Materials Irradiation Facility (IFMIF) [1-3] is an accelerator-based neutron irradiation facility to develop materials for a demonstration fusion reactor next to ITER. For preparing the necessary information to make a decision of the IFMIF construction, Engineering Validation and Engineering Design Activities (EVEDA) have been started. IFMIF/EVEDA prototype accelerator consists of an injector (output energy;100keV), a 175MHz RFQ linac (0.1-5.0MeV), a medium energy beam transport, the first section of Superconducting RF linac
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JAEA-Conf 2011-002 Proceedings of t
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JAEA-Conf 2011-002 31. Preliminary
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6.2 Measurement of neutron-induced
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JAEA-Conf 2011-002 Table 1 Comparis
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JAEA-Conf 2011-002 (T1/2=8,900,000
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JAEA-Conf 2011-002 Though words too
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JENDL-3.3 showed better applicabili
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ENDF. Thus this cross section store
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Acknowledgement JAEA-Conf 2011-002
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In the MALIBU program, isotope conc
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some minor actinides. For major act
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JAEA-Conf 2011-002 code MVP-BURN an
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JAEA-Conf 2011-002 [3] Measurements
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3.1 Experimental Set up JAEA-Conf 2
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References JAEA-Conf 2011-002 [1] N
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JAEA-Conf 2011-002 was large. The a
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JAEA-Conf 2011-002 4. Results and D
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Acknowledgments Present study inclu
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Fig. 1 A conceptural picture of the
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4. Theoretical studies Theoretical
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JAEA-Conf 2011-002 Fig.9 Comparison
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Ion source JAEA-Conf 2011-002 LE
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JAEA-Conf 2011-002 3. Readiness
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JAEA-Conf 2011-002
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JAEA-Conf 2011-002 Figure 1. An exa
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JAEA-Conf 2011-002 Figure 6. Compar
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JAEA-Conf 2011-002 calculation of d
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JAEA-Conf 2011-002 equilibrium emis
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JAEA-Conf 2011-002 Cowley et al. [1
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4. Conclusions We have compared nuc
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of MeV region with highest cosmic-r
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JAEA-Conf 2011-002 events can be id
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JAEA-Conf 2011-002 models and its p
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JAEA-Conf 2011-002
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JAEA-Conf 2011-002
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JAEA-Conf 2011-002 xx
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JAEA-Conf 2011-002 1. The recent ac
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JAEA-Conf 2011-002 4. Conceptual de
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The Institute's staff of about 280
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3. Nuclear Theory Laboratory JAEA-C
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JAEA-Conf 2011-002 References [1] P
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JAEA-Conf 2011-002 reaction 6 Li +
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Using the approximated distribution
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momentum of the constituents of P.
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dσ/dΩ (mb/sr) c.m. scattering ang
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JAEA-Conf 2011-002 [2] N. Austern,
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moderating fast neutrons emitted fr
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JAEA-Conf 2011-002 3. Results and d
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JAEA-Conf 2011-002 the detection de
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Fig.1. Experimental arrangement for
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in this work was confirmed. (2) 153
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Neutron Capture Cross Section of 15
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ENDF resonance parameters are based
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sample changer. The measured flux s
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REFERENCES JAEA-Conf 2011-002 [1] W
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JAEA-Conf 2011-002 Fig. 4: The rela
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Fig. 10: The PHITS2 calculation geo
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for such a low energy region should
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MCNPX calculation was performed bas
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JAEA-Conf 2011-002 We measured dou
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1mm-thick carbon target 22mm in dia
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JAEA-Conf 2011-002 Figure 2 shows e
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The double-differential (n,xp) and
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JAEA-Conf 2011-002 forward angles.
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Fig.3. Two-dimensional plot of PI v
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JAEA-Conf 2011-002 Fig. 7. Deuteron
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JAEA-Conf 2011-002 The new detector
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4. Off line data analysis Double di
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eports of data of carbon-ion incide
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Count [-] 4 10 3 10 2 10 10 1 Charg
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Acknowledgement We are grateful to
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Beam Line BM1 Copper Target BM2 5×
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φ = φbm · ρtof · ρmulti (2) E
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References [1] K. Ishibashi, H. Tak
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Page 192 and 193: analysis of integral experiments [6
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JAEA-Conf 2011-002 - 日本原子力研究開発機構

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