JAEA-Conf 2011-002 - 日本原子力研究開発機構

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Using the approximated distribution, Eq. (1), the 0.981-MeV γ-ray yield can be represented as a function of effective temperature Teff and concentration neff of knock-on tritons: 2 nLi neff Et E C Y E E t exp E dEt mt T C eff T eff 2 ITeff nLi neff m T (2) t The γ-ray emission spectrum can be well fitted to a Gaussian distribution: dY dE eff EE exp Here E0 = 0.981 MeV, and represents the broadening of the fitting curve and has dimension of square energy. The Gaussian distribution with = 96 keV 2 reproduces properly dY /dE in Fig. 6. It was found that there is the pronounced correlation between and Teff shown in . With increasing Teff, the knock- on tritons reach high energies, resulting in the - ray emission spectrum with the wider broadening. Once the parameter is assessed from the experimental data on dY /dE , then Teff could be determined by use of the prove curve in Fig. 7. Equation (2) indicates that once Teff is determined with a fine accuracy, then we can assess neff from the experimental γ- ray yield Y . Fig. 7. Correlation between slope factor of the -ray emission spectrum and effective temperature Teff of knock-on tritons. e One can also obtain information on the confinement property of fusion-born -particles in burning DT plasmas. The theoretical curve in Fig. 4, Teff and T derived experimentally should be used for this purpose. If the experimental plot of (Teff,T) is placed onto the theoretical curve in Fig. 4, then one can reasonably consider the confinement of the -particles to be classical, i.e., the -particles exhibit the classical slowing-down behavior described by the Fokker-Planck equation. If not, the -particles anomalously escape from the plasma core and accordingly their confinement property is deteriorated. In the latter case, because of losses of the -particles at energy below the average birth energy of E0 = 3.52 MeV, the relative fraction of the -particles with high energy around E0 become larger, resulting in the effective temperature Teff of the knock-on tritons becoming higher. Accordingly, the experimental (Teff,T) plot would be placed above the theoretical curve. JAEA-Conf 2011-002 We showed that the 0.981-MeV γ-rays emitted in the 6 Li (t, p1) 8 Li * reaction have an important application for diagnostics of the knock-on tritons and -particles in burning plasmas. If these γ-rays are detected, we can obtain information on key parameters of knock-on triton population (Teff , neff ) 0 2 (3)
JAEA-Conf 2011-002 and confinement properties of fusion-born -particles by comparing experimental data on the 0.981-MeV γ-ray yield and emission spectrum with the theoretical calculations. Here we must refer to some restrictions in applying the above diagnostics method. First, if it is impossible to measure the γ-ray emission spectrum with fine energy resolution, the broadening parameter cannot determined accurately. In this situation, neither neff nor the -particle confinement property can be diagnosed because Teff cannot be estimated from . Second, the proposed diagnostic scenario is useful only in the case that the behavior of energetic tritons is classical. If the energetic tritons escape from the plasma during slowing-down, approximation the slop distribution becomes unavailable, so the diagnostic scenario would fail. This work was supported by Grant-in-Aid for Scientific Research of the Ministry of Education, Culture, Sports, Science and Technology of Japan under the Scientific Research of Priority Areas, “Advanced Diagnostics for Burning Plasmas”. [1] V.G. Kiptily, et al., “Gamma-ray diagnostics of energetic ions in JET”, Nucl. Fusion (2002) 999. [2] V.G. Kiptily, et al., “First γ-ray measurements of fusion–particles in JET trace tritium experiments”, Phys. Rev. Lett. (2004) 115001. [3] V.G. Kiptily, et al., “Gamma- ray imaging of D and alpha ions accelerated by ion cyclotron heating in JET plasmas”, Nucl. Fusion (2005) L21. [4] M. Nakamura, Y. Nakao, V.T. Voronchev, H. Matsuura, O. Mitarai, “ Kinetic analysis of γ-raygenerating reactions for fuel ion and energetic particle diagnostics of DT fusion plasma”, J. phys. Soc. J. (2006) 024801. [5] M. Nakamura, Y. Nakao, V.T. Voronchev, “On the enhancement of nuclear reaction rates in hightemperature plasma”, Phys. Lett. A (2006) 663. [6] M. Nakamura, Y. Nakao, V.T. Voronchev, “Use of the 6 Li + T nuclear reaction for diagnostics of energetic particles in burning plasmas” Nucl. Inst. Meth. Phys. Res. A (2007) 1052. [7] Y. Nakao, M. Nakamura, V.T. Voronchev, “Use of the γ-raysfromthe 6 Li (t, p1) 8 Li * reaction for studying knock-on tritons in the core of fusion plasmas”, Fusion Sci. Technol. (2007) 1045. [8] S.N. Aramovich, B.Ya. Gujovsky, V.N. Protopopov, Izv. Akad. Nauk. Kaz. SSR, Ser. Fiz. Mat. (1984) 24. [9] V.T. Voronchev, K.I. Kukulin, Y. Nakao, Phys. Rev. E (2001) 026413.
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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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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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JAEA-Conf 2011-002 hint at the orig
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Neutron Dose Rate [Sv/hr/src neutro
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JAEA-Conf 2011-002 radiation protec
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Ztarget, Atarget are the numbers fo
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We described our formalism for calc
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2. Model
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analysis of integral experiments [6
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A modified SRAC library was prepare
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JAEA-Conf 2011-002 approximately 0.
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JAEA-Conf 2011-002 constructing the
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Fig.9 Spectrum of gamma-ray followi
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JAEA-Conf 2011-002 in the same way
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JAEA-Conf 2011-002 [7]. For example
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JAEA-Conf 2011-002 (5.0-9.0MeV), a
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components, the 0.56Wt% for hydroge
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Sensitivities of curium isotope con
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decreases of (n,g) reaction rates,
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5. Conclusion JAEA-Conf 2011-002 Wi
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2. Foundation of sensitivity analys
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JAEA-Conf 2011-002 where f g and f
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Fig.1 Sensitivity coefficient of th
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An outline of core configurations o
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0.010% 0.000% -0.010% -0.020% -0.03
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To clarify what nuclides and reacti
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Calculation was performed by the MV
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among these libraries, and the diff
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JAEA-Conf 2011-002 - 日本原子力研究開発機構

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