The LINACs simulation framework

Yee-Rendon, B.; Jameson, R. A.*; Okamura, Masahiro*; Li, C.*; Jiang, P.*; Maus, J. M.*

Proceedings of 32nd Linear Accelerator Conference (LINAC 2024) (Internet), p.492 - 495, 2024/10

https://doi.org/10.18429/JACoW-LINAC2024-TUPB077

LINACs is a simulation framework for designing optics and beam dynamics of charged particles in particle accelerators. LINACs is an open-source software that enables the user complete control over all design and simulation parameters of RFQs. This includes beam-driven design, fully 3D simulation using precise quadrupolar symmetry, and rigorous Poisson solution for external and space charge fields. The code can handle simultaneous particle beams with analytical input distributions and allows input beam scans. The software offers a relatively short running time and provides extensive analysis techniques. This work provides a historical overview of the code, presents results from RFQ models, and discusses future developments.

A Colossal barocaloric effect induced by the creation of a high-pressure phase

Jiang, X.*; Hattori, Takanori; Xu, X.*; Li, M.*; Yu, C.*; Yu, D.*; Mole, R.*; Yano, Shinichiro*; Chen, J.*; He, L.*; et al.

Materials Horizons, 10(3), p.977 - 982, 2023/03

https://doi.org/10.1039/d2mh00905f

As a promising environment-friendly alternative to current vapor-compression refrigeration, solid-state refrigeration based on the barocaloric effect has been attracting world wide attention. Generally, both phases in which a barocaloric effect occurs are present at ambient pressure. Here, instead, we demonstrate that KPF exhibits a colossal barocaloric effect due to the creation of a high-pressure rhombohedral phase. The phase diagram is constructed based on pressure-dependent calorimetric, Raman scattering, and neutron diffraction measurements. The present study is expected to provide an alternative routine to colossal barocaloric effects through the creation of a high-pressure phase.

Fine structure in the decay of U

Sun, M. D.*; Liu, Z.*; Huang, T. H.*; Zhang, W. Q.*; Andreyev, A. N.; Ding, B.*; Wang, J. G.*; Liu, X. Y.*; Lu, H. Y.*; Hou, D. S.*; et al.

Physics Letters B, 800, p.135096_1 - 135096_5, 2020/01

https://doi.org/10.1016/j.physletb.2019.135096

Adsorption of ytterbium onto fungal cells; A pH-dependent contribution of phosphoryl functional group

Jiang, M. Y.*; Onuki, Toshihiko; Yamasaki, Shinya; Tanaka, Kazuya*; Utsunomiya, Satoshi*

Journal of Radioanalytical and Nuclear Chemistry, 295(3), p.2283 - 2287, 2013/03

https://doi.org/10.1007/s10967-012-2285-x

The adsorption of Ytterbium on the cells of yeast has been studied by batch type experiment by changing solution pH. The Yb adsorption species on the yeast cell wall of the was determined by extended X-ray absorption fine structure (EXAFS) spectroscopy combined with a linear combination analysis at various pHs. The results indicated that the contribution of Yb-phosphoryl species was constant between pH 3 and 5, strongly suggesting that most of the Yb was associated with undeprotonated phosphoryl functional groups.

Chemical states of fallout radioactive Cs in the soils deposited at Fukushima Daiichi Nuclear Power Plant accident

Kozai, Naofumi; Onuki, Toshihiko; Arisaka, Makoto; Watanabe, Masayuki; Sakamoto, Fuminori; Yamasaki, Shinya; Jiang, M.

Journal of Nuclear Science and Technology, 49(5), p.473 - 478, 2012/05

https://doi.org/10.1080/00223131.2012.677131

Chemical states of radioactive Cs in the contaminated soils by Fukushima Daiichi Nuclear Power Plant accident has been characterized by the desorption experiments using appropriate reagents solutions and size fractionation of the contaminated soils. Approximately 70% of radioactive Cs in the residual fraction were associated with the size fractions larger than the elutriated one, even though mica-like minerals were contained in the elutriated one. These results strongly suggest that radioactive Cs was irreversibly associated with soil components other than mica like minerals in the contaminated soil.

Spectroscopy of Rf

Qian, J.*; Heinz, A.*; Khoo, T. L.*; Janssens, R. V. F.*; Peterson, D.*; Seweryniak, D.*; Ahmad, I.*; Asai, Masato; Back, B. B.*; Carpenter, M. P.*; et al.

Physical Review C, 79(6), p.064319_1 - 064319_13, 2009/06

https://doi.org/10.1103/PhysRevC.79.064319

-, -, and conversion electron spectroscopy experiments for Rf have been performed using Fragment Mass Analyzer at Argonne National Laboratory. A new isomer with a half-life of 160 s has been discovered in Rf, and it is interpreted as a three-quasiparticle high- isomer. Neutron configurations of one-quasiparticle states in No, the -decay daughter of Rf, have been assigned on the basis of -decay hindrance factors. Excitation energies of the 1/2[620] states in =151 isotones indicate that the deformed shell gap at =152 increases with the atomic number.

Adsorption and nano-particles formation of -elements on microbial cell surface

Onuki, Toshihiko; Jiang, M.*; Utsunomiya, Satoshi*; Kozai, Naofumi; Kato, Kenji*

no journal, , 

Biogenic nano-particles were formed on the cells surface of microorganisms. SEM and TEM analyses showed that REE-phosphate nano-particles less than 100 nm in diameter were developed directly from the cells surface, even though no P ion was added in the solution. In contrast, REE-phosphate precipitates more than 0.001 mm was formed in the solution without microorganisms. Thus, the adsorbed REE was reacted with the released P from inside cells, resulting nano particles formation on the cells surface.

Post-adsorption process of REE (Sm, Yb) phosphate nano-mineralization by microorganism

Jiang, M.; Onuki, Toshihiko; Tanaka, Kazuya*; Kozai, Naofumi; Kamiishi, Eigo; Utsunomiya, Satoshi*

no journal, , 

The objective of the present study is to further understand the post-adsorption process of middle REE (Sm) and heavy REE (Yb) biomineralization by several representative microbes for the long-term exposure. Based on the FESEM and TEM analyses, nano-sized Sm phosphate crystallites with monazite structure formed on these three kinds of microbial cells surfaces and nano-sized Yb phosphate with amorphous phase formed on yeast cells surfaces. The EXAFS data indicated that the chemical states of accumulated Sm and Yb on cells surfaces changed from the mixture of both phosphate and carboxyl sites at 30 min to phosphate precipitates phase at 5 days, suggesting the REE-phosphate mineralization as a major post-adsorption process.

Formation process of samarium phosphate nano-particles by microorganisms

Jiang, M.; Onuki, Toshihiko; Tanaka, Kazuya*; Kamiishi, Eigo; Utsunomiya, Satoshi*

no journal, , 

Formation process of samarium phosphate mineralization on the cell surface of microorganisms has been studied. The rate of nano-particles formation on the cells of yeast was lower than that of soil bacteria, suggesting that thicker cell wall of yeast than soil bacteria gave lower release rate of phosphate ions from inside of cells.

Bio-mineralization of heavy elements on microbial cell surface

Onuki, Toshihiko; Tanaka, Kazuya; Jiang, M.; Kozai, Naofumi; Sakamoto, Fuminori; Suzuki, Yoshinori*; Utsunomiya, Satoshi*

no journal, , 

The interaction of heavy elements involving actinides with microorganisms has been studied by experiments. Here, we report the nanoscale mineralization process of REE phosphate on microbial cell surfaces and sorption of REE by biogenic Mn oxide. We found that dissolved Ce was accumulated on the cell surface, and precipitated as nanoscale phosphate mineral, even though no P was added in the solution. The analyses of nanoscale phosphate mineral indicate that the sorbed Ce on the cell surfaces reacted with P released from inside the yeast cell, resulting in the formation of Ce(III) phosphate nanocrystallites of monazite. The biogenic Mn oxide (plus microbial cells) showed large a positive Ce anomaly in acid solution. With increasing pH, the positive Ce anomaly became less pronounced. Furthermore, negative Ce anomalies were observed at a pH of more than 6.5. This anomaly change was caused by organic matters released by bacteria.