JAEA-Conf 2011-002 - 日本原子力研究開発機構

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JAEA-Conf 2011-002 References [1] P. Sarriguren, M.K. Gaidarov, E. Moya de Guerra, A.N. Antonov: Phys. Rev., C76, 044322 (2007). [2] A.N. Antonov, M.V. Ivanov, M.B. Barbaro, J.A. Caballero, E. Moya de Guerra, M.K. Gaidarov: Phys. Rev., C75, 064617 (2007).
1 , 2 , 3 1 Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Fukuoka 819- 0395, Japan 2 Department of Advanced Energy, Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba 277-8561, Japan 3 Institute of Nuclear Physics, Moscow State University, Moscow 119991, Russia We discuss from theoretical side the possibility of energetic particle diagnostics based on γ- ray measurement in DT fusion plasma at burning stage. Attention is focused on 0.981-MeV γ- rays emitted in the 6 Li (t, p1) 8 Li * reaction governed in the plasma by energetic tritons. It is shown that these γ- rays have an important application for diagnostics of the knock-on tritons and α - particles confined in DT burning plasmas. Fusion plasmas at burning stage will contain great variety of energetic particles: products of fusion reactions, injected beam ions, ions accelerated by electromagnetic waves, and knock-on particles scattered by these particles. These particles are indispensable constituents for plasma burning. They heat bulk electron and ion fluids so that high temperature is sustained and fusion reactions continue for a sufficiently long time. On the other hand, high pressure of the energetic particles can trigger many wave-particle interactions and fast particle-driven instabilities. Thus, establishment of confined energetic particle diagnostics is recognized as one of the key issues in nuclear fusion research aiming at ITER. These energetic particles should be diagnosed while they are in the plasma. Since the measurements inside plasma are hardly possible, it is appropriate to use indirect methods operating with neutral particles or photons freely escaping from plasma core. Gamma-ray spectroscopy is recognized to be a promising tool for such purposes [1-3]. Previously we examined rates of various γ-ray-generating reactions in fusion plasmas, and found that some of them are essentially enhanced by supra-thermal channels induced by energetic knock-on ions [4,5]. The respective γ-ray fluxes carry signature of the knock-on ions and may effectively be used for plasma diagnostics. This especially concerns the threshold 6 Li (t, p1) 8 Li * reaction emitting 0.981-MeV γ-quanta and governed by fast tritons. Thus we proposed use of this γ-line for diagnosing knock-on tritons and α-particles confined in burning DT plasmas [6, 7]. In this paper, after describing the outline of the energetic particle diagnostics based on the γ-ray measurement, and we will show that key parameters of the knock-on triton population (Teff, neff ), as well as the confinement property of α-particles can be obtained by comparing experimental data on the 0.981-MeV γ-ray yield and emission spectrum with the theoretical slowing-down calculations. JAEA-Conf 2011-002 The basic idea is to use a small amount of 6 Li as admixture in DT plasma to induce nuclear reaction capable of providing information on energetic particles. We consider an endotherrmic γ-ray mode of the
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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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Page 44 and 45: Acknowledgments Present study inclu
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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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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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JAEA-Conf 2011-002
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JAEA-Conf 2011-002 reactions. Figur
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JAEA-Conf 2011-002 Fig. 3. The angu
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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 For
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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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