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Hartzell, S.*; Furutani, K. M.*; Parisi, A.*; Sato, Tatsuhiko; Kase, Yuki*; Deglow, C.*; Friedrich, T.*; Beltran, C. J.*
Radiation (Internet), 5(2), p.21_1 - 21_24, 2025/06
Sari, A.*; Meleshenkovskii, I.*; Ogawa, Tatsuhiko; Tran, K.-T.*; Jinaphanh, A.*; Jouanne, C.*; Zoia, A.*
Nuclear Instruments and Methods in Physics Research A, 1072, p.170168_1 - 170168_17, 2025/03
Times Cited Count：2 Percentile：73.73(Instruments & Instrumentation)Electron accelerators cover a wide range of applications, from nuclear waste package assay and security-related tasks to radiation therapy. High-energy photons produced by electron Bremsstrahlung radiation might induce photonuclear reactions emitting secondary neutrons. In this paper, we perform a two-stage benchmark for Monte Carlo simulation of photoneutron fields from electron accelerators operating in the 4-20 MeV range. On the one hand, we benchmark three independently developed Monte Carlo codes, i.e., MCNP, TRIPOLI-4; and PHITS, using ENDF7u photonuclear data from the ENDF/B-VII.1 library. On the other hand, we benchmark two photonuclear data sub-libraries, i.e., ENDF7u and JENDL-5, as well as nuclear reaction models, using the PHITS code. Errors in ENDF7u for W-184 and Ta-181 cause unphysical shapes of the photoneutron energy spectra with the three codes. Questionable behaviors are also found with JENDL-5, which calls for further examinations in this recently released library. For the cases of heavy water and beryllium, the photoneutron energy spectra obtained with MCNP6 is invalidated. We identified that the problem stems from wrong treatment of the reference frame in using the ACE data files by MCNP and previous versions of PHITS. Results obtained for tungsten and tantalum show that photoneutrons are overall emitted in an isotropic manner. However, results obtained for heavy water and beryllium display different tendencies. This investigation should help Monte Carlo code users to refine the current validity domain of the latest releases of MCNP6, PHITS and TRIPOLI-4 for the simulation of photoneutrons.
Nguyen, T. H.*; Le Ba, T.*; Tran, C. T.*; Nguyen, T. T.*; Doan, T. T. T.*; Do, V.-K.; Watanabe, Masayuki; Pham, Q. M.*; Hoang, S. T.*; Nguyen, D. V.*; et al.
Hydrometallurgy, 213, p.105933_1 - 105933_11, 2022/08
Times Cited Count：31 Percentile：86.22(Metallurgy & Metallurgical Engineering)A continuous counter-current extraction for the selective recovery of thorium (Th) and uranium (U) from the Yen Phu (Vietnam) rare earth concentrate leach solutions was systematically studied. The primary amine N1923 was used as an extractant which was prepared in the isoparaffin IP-2028 diluent. Thorium and uranium were selectively recovered in a hydrometallurgical circuit established by continuous mixer-settler extraction, scrubbing, and back-extraction at the laboratory scale. The desired purity of Th and U can be achieved by managing the volume ratio of organic to aqueous phase (O/A ratio) in the corresponding steps. Highly pure Th and U were recovered from the pregnant back-extraction liquor and the raffinate, respectively, which have satisfactory properties for further processing of the subsequent nuclear materials.
Okada, Atsushi*; He, S.*; Gu, B.; Kanai, Shun*; Soumyanarayanan, A.*; Lim, S. T.*; Tran, M.*; Mori, Michiyasu; Maekawa, Sadamichi; Matsukura, Fumihiro*; et al.
Proceedings of the National Academy of Sciences of the United States of America, 144(15), p.3815 - 3820, 2017/04
Cooper, W. A.*; Brunetti, D.*; Faustin, J. M.*; Graves, J. P.*; Pfefferl
, D.*; Raghunathan, M.*; Sauter, O.*; Tran, T. M.*; Chapman, I. T.*; Ham, C. J.*; et al.
Nuclear Fusion, 55(6), p.063032_1 - 063032_8, 2015/06
Times Cited Count：3 Percentile：12.01(Physics, Fluids & Plasmas)An approximate model for a single fluid 3D MHD equilibrium with pure isothermal toroidal flow with imposed nested magnetic flux surfaces is proposed. It recovers the rigorous toroidal rotation equilibrium description in the axisymmetric limit. The approximation is valid under conditions of nearly rigid or vanishing toroidal rotation in regions with 3D deformation of the equilibrium flux surfaces. Bifurcated helical core equilibrium simulations of long-lived modes in the MAST device demonstrate that the magnetic structure is only weakly affected by the flow but that the 3D pressure distortion is important. The pressure is displaced away from the major axis and therefore is not as noticeably helically deformed as the toroidal magnetic flux under the subsonic flow conditions. Fast particle confinement is investigated with the VENUS code. In the presence of toroidal flow, the drift orbit equations depend on the electrostatic potential associated with the rotation and quasineutrality at lowest order in Larmor radius. When the equilibrium has 3D deformations, geometrical terms appear from the evaluation of Ohm's Law that considerably complicates the description of fast particle confinement.
Onoda, Shinobu; Abe, Hiroshi; Yamamoto, Takashi; Oshima, Takeshi; Taniguchi, Takashi*; Teraji, Tokuyuki*; Siyushev, P.*; Tran, T. H.*; Yang, S.*; Fedder, H.*; et al.
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no abstracts in English
