摘要：
In order to improve the utilization of spent fuel, molten salt electrolysis is used to separate lanthanides from spent fuel. The electrochemical reduction mechanism of Ce(III) ions and dynamic properties of Ce(III)/Ce(0) were provided in the LiCl-KCl molten salt by diversified electrochemical techniques. The diffusion coefficient of Ce(III) and the exchange current densities of Ce(III)/Ce(0) on the W electrode were calculated by cyclic vol-tammetry and linear polarization, and the reaction activation energy was calculated to be 30.8 kJ center dot mol-1. The electrochemical behaviors were measured in the LiCl-KCl-CeCl3-K2ZrF6 molten salt on the W electrode and LiCl-KCl-CeCl3 molten salt on the Zr electrode at 753 K. The redox mechanism of Ce(III) ions was studied on the Zr electrode. Compared the reaction at different electrodes, the reduction potential of cerium on the Zr electrode is more correct than that on the W electrode, the underpotential displacement of cerium and zirconium due to the formation of alloy is 0.26 V, which was detecteted using cyclic voltammetry, square wave voltammetry and chronopotentiometry. In addition, the feasibility of extracting Ce on the Zr electrode by potentiostatic elec-trolysis at-1.9 V and-2.2 V in the LiCl-KCl molten salt. The cathodic deposition output was characterized by XRD and SEM-EDS, Ce-Zr solid solution was derived under the different conditions. Simultaneously, the Ce metal was discovered when the deposition potential at-2.2 V. The ICP-OES results showed that the extraction ratio of was about 94.02 % for Ce(III) after potentiostatic electrolysis at-2.2 V for 5 h.
期刊：
Chinese Journal of Physics,2024年 ISSN：0577-9073
通讯作者：
Wenbin Lin
作者机构：
[Jie Li] School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;[Bo Yang; Wenbin Lin] School of Mathematics and Physics, University of South China, Hengyang, 421001, China
通讯机构：
[Wenbin Lin] S;School of Mathematics and Physics, University of South China, Hengyang, 421001, China
摘要：
We investigate the hydrostatic equilibrium configurations of strange stars within the framework of Rastall-Rainbow theory of gravity. These stars are primarily composed of strange quark matter, with its distribution governed by the color-flavor-locked phase of quark matter equation of state (EoS). Using this EoS, we numerically solve the modified Tolman–Oppenheimer–Volkoff equation to obtain different quark star models. We find that the parameters from this modified gravity have specific contributions to the structure of quark stars and introduce new descriptions for massive celestial bodies. Aslo, the mass–radius relation strongly depends on the parameters from the considered EoS. Furthermore, we analyze the impact of these parameters on the gravitational redshift and compactness of quark stars.
关键词：
Germanium;Tartaric acid;Selective separation;Column separation;D201 x 7 resin
摘要：
Germanium (Ge) exhibits excellent optical and electrical properties. Due to the low reserves of Ge and lack of independent mineral resources, zinc refinery residues have become an important source of Ge. In this work, a D201 x 7 resin has been employed in the selective separation of Ge from a sulfuric solution using tartaric acid as a complexing agent. In the sulfuric acid system, Ge(OH)4 was converted to an anionic complex [GeO2(OH)2C4H4O4]2- at a 1:1 tartaric acid to Ge molar ratio. The anion exchange D201 x 7 resin adsorbed the Ge tartrate anionic complex. The adsorption process exhibited pseudo-second-order kinetic behavior and adhered to the Langmuir isothermal adsorption model. The maximum adsorption capacity of D201 x 7 resin for Ge was 214 mg g-1. Selective Ge uptake and purification could proceed by column separation The results showed that enrichment factor was 74.7, and the desorption concentration of Ge was increased from 500 mg L-1 to 36.6 g L-1. The D201 x 7 resin exhibited high selectivity, excellent adsorption performance and good stability, making it a viable candidate in industrial applications.
作者机构：
[Xie, Chao; Wang, Hong; Yu, Tao] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Xie, Chao; Wang, Hong; Lu, Wenjun; Wang, Xiangshuai] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Xie, Chao; Yu, Tao] Univ South China, Key Lab Adv Nucl Energy Technol Design & Safety, Minist Educ, Hengyang 421001, Peoples R China.
通讯机构：
[Wang, H ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Peoples R China.
摘要：
To ensure the safety and stability of the beach surface of the decommissioned uranium mill tailings pond, this paper uses red clay-bentonite and red clay (1:1) to carry out covering layer radon reduction simulation experiments to study the temperature, humidity, and radon reduction effect of the covering layer under natural conditions. The results show that the radon exhalation rate of red clay-bentonite cover layer is only 0.32 times that of red clay, which has a better radon reduction effect. The red clay-bentonite cover layer has better water retention and comparable heat preservation effect than red clay cover layer. The red clay-bentonite and red clay temperature curves follow the same evolution trend and were close together in the same outdoor conditions, and the humidity curves showed a difference of 1% to 3%. Soil temperature is the dominant factor affecting the variation of radon exhalation of red clay-bentonite and red clay covering layer with unsaturated water content.
期刊：
Materials Science and Engineering B-Advanced Functional Solid-State Materials,2024年302:117245 ISSN：0921-5107
通讯作者：
Feng Gao
作者机构：
State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Key Laboratory of High-Performance Structural Materials and Thermo-surface Processing Guangxi University, Nanning 530004, China;College of Resources, Environment and Materials, Guangxi University, Nanning 530004, China;[Shunyan Ning] School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;[Feng Ren; Ao Li; Jiaming Huang; Shuxin Mi; Toyohisa Fujita; Xinpeng Wang; Feng Gao] State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Key Laboratory of High-Performance Structural Materials and Thermo-surface Processing Guangxi University, Nanning 530004, China<&wdkj&>College of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
通讯机构：
[Feng Gao] S;State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Key Laboratory of High-Performance Structural Materials and Thermo-surface Processing Guangxi University, Nanning 530004, China<&wdkj&>College of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
摘要：
The effects of different sintering temperatures on the structure and upconversion luminescent properties of Li+ doped Bi3.46Ho0.04Yb0.5Ti3O12: 0.05Li (BHYTO: Li) phosphors were investigated. The upconversion emission intensity first increases and then decreases with the increase of sintering temperature from 700 to 1000 °C. The temperature induced grain growth contributes to the enhancement of UC luminescence, but the increased defects such as Bi and O degrade the luminescence. The combined effect of them makes the optimal luminescence appears in the specimens sintered at 800 °C, which is about 2 times stronger than that of those specimens sintered at 700 and 1000 °C. The mean lifetime for the specimens sintered from 700 to 1000 °C increases monotonically from 60.2 to 81.5 μs, with band gap (Eg) from 2.8 to 3.0 eV. The maximal quantum efficiency can reach 0.28 % due to enhanced crystallinity.
期刊：
Journal of Radioanalytical and Nuclear Chemistry,2024年:1-8 ISSN：0236-5731
通讯作者：
Wendong Feng
作者机构：
[Wendong Feng] School of Nuclear Science and Technology, University of South China, Hengyang, People’s Republic of China;[Kai Gao; Xiaoyan Cui] Waste Management Department, China Institute for Radiation Protection, Taiyuan, People’s Republic of China;[Hengrui Zhang] Suzhou Nuclear Power Research Institute Co., Ltd., Suzhou, People’s Republic of China
通讯机构：
[Wendong Feng] S;School of Nuclear Science and Technology, University of South China, Hengyang, People’s Republic of China
摘要：
The effects of reaction temperature, reaction time, NaOH concentration and dosage on the hydrolysis rate of TBP were investigated. With the optimized conditions, the hydrolysis rate of TBP reached more than 99.5%. The reaction temperature is the greatest impact factor of TBP hydrolysis. As the hydrolysis reaction proceeded, TBP was first hydrolyzed into NaDBP, and then further hydrolyzed into Na2MBP. Three phases were formed after alkaline hydrolysis of TBP/n-dodecane, the n-dodecane (≈70% v%) was at the top phase that could be recycled or reused.
摘要：
LaFe1-xMnxO3 (0 <= x <= 0.9) samples were synthesized through the sol-gel method. According to X-ray diffraction (XRD) results, with the increase of Mn doping, the crystal structure of the sample changes from orthogonal Pnma structure to rhombohedral R3c structure, and a two-phase coexistence phenomenon exists within the range of 0.4 <= x <= 0.7. Using Mossbauer spectroscopy, the coexistence range of the two phases and the iron content in each phase were identified. At x=0.4, the Pnma phase contribution (91.1%) dominates, with only a slight R3c phase contribution (8.9%). As the amount of Mn doping gradually increases, the R3c phase becomes dominant at x=0.6 (74.6%), and the Pnma phase completely disappears at x=0.8. This work will provide an important perspective for future researchers studying similar phase coexistence systems.
作者机构：
[Cheng, Pin-Jing; Tang, Lei-Xun; Zheng, Bo; Feng, Song; Wang, Hao-Qiang; Li, Xin-Xiang; Zhao, Ji-Rong; Zhao, Da-Jun; Xue, Jie-Ming; Xiao, Min; Luo, Wen; Li, Bao-Qian] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Yi, Han; Chen, Yong-Hao] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.;[Yi, Han; Chen, Yong-Hao] Spallat Neutron Source Sci Ctr, Dongguan 523803, Peoples R China.;[Liu, Rong; Yang, Yi-Wei; Han, Zi-Jie] China Acad Engn Phys, Inst Nucl Phys & Chem, Mianyang 621900, Peoples R China.
通讯机构：
[Feng, S ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
Neutron-induced total cross section;Natural lead;Time-of-flight;TALYS-1.96;CSNS Back-n white neutron beamline
摘要：
The neutron-induced total cross sections of natural lead have been measured in a wide energy range (0.3 eV–20 MeV) on the back-streaming white neutron beamline (Back-n) at the China Spallation Neutron Source. Neutron energy was determined by the neutron total cross-section spectrometer using the time-of-flight technique. A fast multi-cell fission chamber was used as the neutron detector, and a 10-mm-thick high-purity natural lead sample was employed for the neutron transmission measurements. The on-beam background was determined using Co, In, Ag, and Cd filters. The excitation function of
$$^\text {nat}$$
Pb(n, tot) reaction below 20 MeV was calculated using the TALYS-1.96 nuclear-reaction modeling program. The present results were compared with previous results, the evaluated data available in the five major evaluated nuclear data libraries (i.e., ENDF/B-VIII.0, JEFF-3.3, JENDL-5, CENDL-3.2, and BROND-3.1), and the theoretical calculation curve. Good agreement was found between the new results and those of previous experiments and with the theoretical curves in the corresponding region. This measurement obtained the neutron total cross section of natural lead with good accuracy over a wide energy range and added experimental data in the resonance energy range. This provides more reliable experimental data for nuclear engineering design and nuclear data evaluation of lead.
作者：
Fujita, Mitsutoshi;He, Song;Sun, Yuan;Zhang, Jun
期刊：
Journal of High Energy Physics,2024年(1) ISSN：1029-8479
通讯作者：
Fujita, M
作者机构：
[Fujita, M; Fujita, Mitsutoshi] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[He, Song] Jilin Univ, Coll Phys, Ctr Theoret Phys, Changchun 130012, Peoples R China.;[He, Song] Albert Einstein Inst, Max Planck Inst Grav Phys, Muhlenberg 1, D-14476 Golm, Germany.;[Sun, Yuan] Cent South Univ, Sch Phys & Elect, Changsha 418003, Peoples R China.;[Zhang, Jun] Univ Alabama, Dept Phys & Astron, 514 Univ Blvd, Tuscaloosa, AL 35487 USA.
通讯机构：
[Fujita, M ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
Gauge-Gravity Correspondence;Holography and Condensed Matter Physics (AdS/CMT);Confinement
摘要：
We compute holographic entanglement entropy (EE) and the renormalized EE in AdS solitons with gauge potential for various dimensions. The renormalized EE is a cutoff-independent universal component of EE. Via Kaluza-Klein compactification of S1 and considering the low-energy regime, we deduce the (d - 1)-dimensional renormalized EE from the odd-dimensional counterpart. This corresponds to the shrinking circle of AdS solitons, probed at large l. The minimal surface transitions from disk to cylinder dominance as l increases. The quantum phase transition occurs at a critical subregion size, with renormalized EE showing non-monotonic behavior around this size. Across dimensions, massive modes decouple at lower energy, while degrees of freedom with Wilson lines contribute at smaller energy scales.
摘要：
Electrosorption holds extraordinary promise for uranium (U(VI)) capture but is still limited by the finite accessible active sites of electrode materials, poor surface wettability and its intrinsic co-ion repulsion effect. Here we originally designed KOH-etched porous graphitic carbon nitride (g-C3N4) as active material, and multi-functional crosslinked xanthan gum-polyacrylic acid (XG-PAA) as binder to fabricate g-C3N4-X electrode for U(VI) capture. The abundant in-plane nanopores on 2D g-C3N4 lamellar, rich O- and N-containing active sites, and 3D tough interconnected conductive architecture, endowed g-C3N4-X electrode with fast electron/ion transport channels, alleviated co-ions exclusion, superior electrochemical properties, and hydrophilicity. These unique structure characteristics enabled U(VI) ions to form micro electric-field attraction with negatively charged COO- groups in advance to alleviate co-ion repulsion, then to electro-migrate towards and coordinate with active sites, and eventually to be electrocatalytic reduced into U(IV) deposits. Consequently, the g-C3N4-X electrode exhibited a 1.87 times faster adsorption kinetics, a much higher removal ratio of 98.1% within 70 min than traditional PVDF-bound electrode. Meanwhile, the cumulative adsorption capacity of g-C3N4-X electrode after six cycles was up to 1459.1 mg g−1. This efficient, scalable, and cost-effective g-C3N4-X electrode represents a significant step forward toward the practical applications of U(VI) electrosorption.
通讯机构：
[Peng, AG ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
(137)Cs;(239+240)Pu;Distribution characteristics;Lake East dongting;Lake sediments
摘要：
Plutonium-239+240 and (137)Cs in the environment can usually be used to track the impact of nuclear activities on the environment, and have become important tools in environmental geochemical studies. In this study, nine sediment cores (E1-E9) in Lake East Dongting were collected and measured for the activity concentration of (239+240)Pu, (137)Cs and the atomic ratio of (240)Pu/(239)Pu, and then their vertical distribution characteristics were analyzed. The results show that: the activity concentrations of (137)Cs and (239+240)Pu in Lake East Dongting ranged from 5.26±0.43 to 28.6±2.23 Bq kg(-1) and 0.29±0.02 to 1.37±0.09 Bq kg(-1), with an average of 7.48±0.68 Bq kg(-1) and 0.39±0.03 Bq kg(-1), respectively. The atomic ratios of (240)Pu/(239)Pu are 0.168±0.012-0.211±0.015, which are basically consistent with the global atmospheric deposition. The vertical profiles of (137)Cs and (239+240)Pu in sediment cores show obvious single-peak distribution in E1-E6 and bimodal distribution in E7-E9. The results of sedimentation rates calculated by (137)Cs and (239+240)Pu method ranged from 0.59cm y(-1) to 1.99cm y(-1) with a mean of 1.18cm y(-1) and 0.61cm y(-1) to 2.18cm y(-1) with a mean of 1.26cm y(-1). The inventories of (137)Cs and (239+240)Pu in nine sediment cores are 5.87-10.8 kBq m(-2) and 307-545 Bq m(-2), which are about 8-14 and 9-15 times the inventory in the global average atmospheric deposition at the same latitude respectively. Comparing the results of the sedimentation rates and the inventories from different sampling points indicates that extreme climatic events and human activities have a significant impact on sediment environment of Lake East Dongting.
作者机构：
[Wen Luo] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, People's Republic of China;[Ke Liu; Fuqiu Shao; Tongpu Yu] Department of Physics, National University of Defense Technology, Changsha, 410073, People's Republic of China;[Binglin Wang; Xiaojun Duan; Liang Yan] College of Sciences, National University of Defense Technology, Changsha, 410073, People's Republic of China;[Qian Dong] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, People's Republic of China<&wdkj&>Department of Physics, National University of Defense Technology, Changsha, 410073, People's Republic of China
通讯机构：
[Wen Luo] S;[Tongpu Yu] D;School of Nuclear Science and Technology, University of South China, Hengyang, 421001, People's Republic of China<&wdkj&>Department of Physics, National University of Defense Technology, Changsha, 410073, People's Republic of China
摘要：
In Particle-In-Cell simulation, macro-particles represent clusters of numerous physical particles. Rational merging or splitting of these macro-particle clusters can significantly improve the efficiency of simulation and reduce unnecessary computational requirements and memory consumption. Here, we propose a dynamical particle merging and splitting algorithm. For macro-particle in different density regions, regional macro-particle clusters are obtained by dividing them with the Minkowski metric function. Dynamic merging and splitting of macro-particles is achieved by dynamically changing the number of macro-particle clusters to reduce the number of macro-particles without substantially distorting the physical description of the system. To test the capability of the algorithm, we also compare its performance under three types of classical plasma cases: two-stream instability (1D), QED cascades (2D), and magnetic shower (3D). The results show a good agreement with expectations.
期刊：
Journal of Environmental Radioactivity,2024年272:107331 ISSN：0265-931X
通讯作者：
Hong, CS
作者机构：
[Wen, Jiale; Xie, Bingbing; Hong, CS; Hong, Changshou; Wang, Hong; Wang, Yuhang] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Wang, Hong] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Wen, Jiale; Xie, Bingbing; Hong, Changshou; Wang, Hong; Wang, Yuhang] Univ South China, Hunan Prov Engn Technol Res Ctr Uranium Tailings T, Hengyang 421001, Peoples R China.
通讯机构：
[Hong, CS ] U;Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Peoples R China.
关键词：
Numerical simulation;Radon concentration field;Ramp;Temperature field
摘要：
By introducing the parameters of radon exhalation rate and radon diffusion coefficient, the distribution of radon concentration field on ramp under the condition of superposition of temperature field and flow field is simulated. The simulation results show that the distribution of radon concentration in the ramp under the condition of low-speed ventilation is greatly affected by the temperature field and flow field, and the change of radon exhalation caused by temperature is the main factor leading to the change of radon concentration in the ramp. The change of temperature will cause the overall increase of radon concentration in the ramp. Under the condition of constant flow field, the radon concentration in the chamber is more than two times higher than the average radon concentration in the ramp. Some areas severely exceeded the limit.
通讯机构：
[Liu, M ] U;Univ South China, Coll Nucl Sci & Technol, Hengyang 421200, Hunan, Peoples R China.;Zhuhai Tsinghua Univ, Res Inst Innovat Ctr, 101 Univ Ave, Zhuhai 519000, Peoples R China.
摘要：
In this study, DyFe1-xCrxO3 (DFCO) was synthesized by sol-gel and underwent magnetic measurements and analysis. The experimental data were fitted and calculated by a four-sublattice molecular field model. Unlike previous studies, we found that in DyFe1-xCrxO3, the spin of the A-site rare earth ion Dy3+ also changed simultaneously with the spin reorientation of the Fe3+/Cr3+ ions. The effective spin is defined as the projection of the A site's total spin on the B site's spin plane, and the curve of temperature changes was obtained after fitting. This is convincing and, at the same time, provides a reference for the development of spintronic devices in the future.
关键词：
Ti alloys;surface nitriding;microhardness;wear resistance;high-temperature oxidation resistance
摘要：
Titanium alloys are considered lightweight alloys and are widely applied across various industries. However, their low hardness, poor wear resistance, and limited oxidation resistance restrict their prospects for wider application. In this paper, nitride coatings were prepared using three preparation processes, namely laser surface nitriding (LSN), physical vapor deposition (PVD), and plasma ion implantation (PII). Their microstructure, microhardness, tribological behavior, and high-temperature oxidation characteristics were compared. The experimental results revealed that nitrided coatings were successfully prepared using the three methods. However, a comparison of these data shows that the LSN coating exhibited superior comprehensive performance. It achieved the maximum thickness within the shortest preparation time: the thickness was about 280 mu m and the deposition rate of the LSN method was 2250 and 90,000 times higher than those of the PVD and PII methods. Nitrides have high hardness, but the carrying capacity could be attributed to the thickness of the coatings: the PVD coating could withstand a force of 500 g, while the PII coating only withstood a force of less than 25 g. In addition, as hardness is the most important factor for excellent wear resistance, the average volumetric wear rate of the LSN and PVD coatings was about 9 x 10-6 mm3/m center dot N, and their relative wear resistance was 49.2 times that of Ti6Al4V. Meanwhile, the excellent bond between the LSN coating and the substrate was evidenced by a high-temperature oxidation test during a rapid heating-cooling cycle.
关键词：
Space gravitational wave detection;Micro electric thruster;Hall thruster;Faraday probe;Response time
摘要：
An advanced Watt class Hall Micro Thruster (HMT) is offered for Space Gravitational Wave Detection (SGWD), and an investigation has been conducted on its start-up, shutdown, rise, and fall response times. The research involved creating a circuit for thruster discharge and signal acquisition, using a Faraday probe to measure the plasma plume signal generated by the thruster, and characterizing the thrust directly. Ultimately the response time of the thruster is extracted from the discharge current and Faraday current signals. The experimental results demonstrate that the HMT has a response time ranging from 1.08 ms to 16.76 ms at mass flow rates of 0.02 mg/s and 0.04 mg/s, meeting the SGWD requirements for micro thruster response time. This research provides a physical foundation and explanation for the variation of HMT response time with discharge voltage versus mass flow rate with several key parameters that affect HMT plasma discharge, such as neutral gas number density (n(n)) and ionization mean free path (lambda(i)). Furthermore, we have examined several anomalies in the signal. Overall, this research provides a brand-new method for measuring the thrust response time of electric thrusters.
摘要：
This study utilizes both experimental and computational approaches to investigate the performance of Lu(2)Ti(2)O(7)(LTO) and Lu(1.5)Ce(0.5)Ti(2)O(7+x)(LCTO) pyrochlores under high pressure. The structural changes of LTO and LCTO pyrochlores were characterized usingin-situsynchrotron x-ray diffraction (SXRD) andin-situRaman spectroscopy at pressures up to 44.6 GPa. The kinks inP-aandP-Vcurves at around 5 GPa are mainly attributed to the interaction between the pressure medium and the isostructural changes. The onset pressures for transitioning from the cubic pyrochlore phase (Fd-3 m) to the monoclinic phase (P2(1)) are observed at 32.5 GPa and 38.1 GPa, respectively. It is important to note that at the highest measured pressures, the phase transition remains incomplete. This partial transition is likely the result of oriented disorder among cations and anions under high pressure. In addition, introducing Ce as a dopant significantly enhances structural stability. This can be explained by the larger ionic radius of Ce, which hinders the disordering process.
作者机构：
[Axel Koenies] Max-Planck-Institut fur Plasmaphysik Teilinstitut Greifswald, Greifswald, Deutschland, GERMANY;[Jinjia Cao] School of Nuclear Science and Technology, University of South China, Hengyang 421001, CHINA;[Ralf Kleiber] Max-Planck-Institut fur Plasmaphysik Teilinstitut Greifswald, Wendelsteinstrasse 1, 17491 Greifswald, Greifswald, 17491, GERMANY
摘要：
We calculate Alfv\'en eigenmodes within a magnetic island (MiAE) 
 which have been conjectured over a decade ago. Starting from 
 a cylindrical plasma equilibrium, we calculate the complete metric of 
 the island interior assuming an iota profile with a constant shear for 
 Wendelstein 7-X (W7-X)
 parameters. Then, we solve the
 resulting magneto-hydrodynamic (MHD) equations inside the island
 optionally considering finite 
 Larmor radius (FLR) corrections. 
 
 We find various eigenmodes in the lowest gaps for $n=0$. 
 The eigenmode with the lowest frequency shows a weakly non-linear dependence on the island width.
 This non-linear behaviour and the appearance of odd and 
 even modes deviates qualitatively from an earlier frequency estimate.
