Journal of the Korean Physical Society最新文献

{"title":"Propagation of dust-ion-acoustic solitary waves in an unmagnetized dusty plasma with Kaniadakis distributed electrons","authors":"Tirthanath Doley,&nbsp;Samiran Das","doi":"10.1007/s40042-026-01631-7","DOIUrl":"10.1007/s40042-026-01631-7","url":null,"abstract":"<div><p>The propagation characteristics of dust-ion-acoustic (DIA) solitary waves in an unmagnetized dusty plasma composed of negative mobile dusts, ions, and Kaniadakis distributed electrons are theoretically investigated. Employing the well-known reductive perturbation technique, both the Korteweg–de Vries (KdV) and modified Korteweg–de Vries (mKdV) equations are derived to examine the influence of dust-to-ion density ratio <span>((sigma ))</span>, dust charge number <span>((Z_d))</span>, Kaniadakis deformation parameter <span>((kappa ))</span>, and the initial streaming speed of ions <span>((u_{i0}))</span> and dusts <span>((u_{d0}))</span> on the dynamics of DIA solitary waves. It is found that there is a non-existence region of KdV-DIA solitons for some initial streaming speed of dust, as well as dust charge number. Both compressive and rarefactive small-amplitude KdV-DIA solitons, and only compressive mKdV-DIA solitons with distinct characteristics are observed. Moreover, for the same set of plasma parameters, the mKdV-DIA solitons exhibit higher amplitudes than the corresponding KdV-DIA solitons. For compressive solitons, the amplitude increases with increasing <span>(Z_d)</span> and <span>(sigma )</span>. The results also indicate that the deformation parameter <span>(kappa )</span> has a significant influence on mKdV-DIA solitons, while it does not affect KdV-DIA solitons. In addition, the dependence of the DIA soliton width on various plasma parameters is also investigated.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 4","pages":"351 - 366"},"PeriodicalIF":1.0,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148704210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of a ThO2 target for actinium-225 development at IRIS","authors":"Jaehong Kim,&nbsp;Bum Sik Park,&nbsp;Yeong Heum Yeon,&nbsp;Hyoun Woo Jung,&nbsp;Beom Yeol Baek,&nbsp;In Seok Hong,&nbsp;Hee Joong Yim,&nbsp;Jin Ho Lee,&nbsp;Taeksu Shin","doi":"10.1007/s40042-026-01646-0","DOIUrl":"10.1007/s40042-026-01646-0","url":null,"abstract":"<div><p>Recently targeted alpha therapy (TAT) using actinium-225 (²²⁵Ac) has been of interest due to impressive clinical results. The ²²⁵Ac radioisotope decays into bismuth-209 (²⁰⁹Bi) by emitting four alpha and two beta particles with a half-life of 9.9 days, which is appropriate for medical applications. Several research groups reported that ample quantities of ²²⁵Ac could be produced via spallation of thorium-232 (²³²Th) with energetic protons, having less than 0.1% of actinium-227 (²²⁷Ac) as a byproduct. In order to reduce the ²²⁷Ac/²²⁵Ac ratio, IRIS will employ the energy range of 40–70 MeV protons irradiated onto the Th target. The target has a structure of 30 mm diameter and a thickness of 3 mm ThO₂ with a 0.5 mm-thick aluminum front window, which securely seals the target material. To ensure the stability and safety of thorium targets under high-power beam conditions, a packaging design for the protective Al layer of thorium targets will be adapted and accompanied by detailed mechanical and thermal analyses.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 on","pages":"518 - 524"},"PeriodicalIF":1.0,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Allison scanner development and measurements in the LEBT of the KOMAC 100 MeV proton accelerator","authors":"Seokho Moon,&nbsp;Dong-Hwan Kim,&nbsp;Seunghyun Lee,&nbsp;Sang-Pil Yun,&nbsp;Sung-Yun Cho,&nbsp;Han-Sung Kim,&nbsp;Hyeok-Jung Kwon","doi":"10.1007/s40042-026-01642-4","DOIUrl":"10.1007/s40042-026-01642-4","url":null,"abstract":"<div><p>This work presents the design, development, and measurement results of the Allison scanner installed in the low energy beam transport (LEBT) section of the 100 MeV proton accelerator at KOMAC. The Allison scanner is a widely used diagnostic device that enables precise measurement of transverse emittance by electrostatically sweeping the beam with position scan. In this study, we describe the Allison scanner development process, highlight the issues encountered during fabrication and integration, and discuss their underlying causes along with the solutions that were implemented. Furthermore, we present the measurement results obtained with the scanner and evaluate its performance in characterizing the beam quality. In addition, the stability of the ion source, monitored with the Allison scanner during the first half of the 2025 user service period, is analyzed and discussed.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 on","pages":"525 - 535"},"PeriodicalIF":1.0,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and characterization of a ribbon-type ion beam source test bench for ion implantation applications","authors":"Junbeom Park,&nbsp;MinKeun Lee,&nbsp;Wooyoung Choi,&nbsp;Daehyun Kim,&nbsp;Kyoung-Jae Chung","doi":"10.1007/s40042-026-01650-4","DOIUrl":"10.1007/s40042-026-01650-4","url":null,"abstract":"<div><p>As semiconductor fabrication increasingly requires precise control of ion energy and implantation current, reliable evaluation of ion source extraction characteristics becomes essential. In this study, a ribbon-type ion beam source test bench is developed with independent control of plasma generation and beam extraction conditions. A multi-channel Faraday cup is employed to measure spatially resolved beam current distributions and to reconstruct two-dimensional beam profiles. By varying extraction voltage, arc current, and electrode spacing, we identify the normal extraction window and the condition that minimizes beam spreading along both axes. The results show that extracted current and beam focusing are strongly coupled in the three-electrode extraction system, demonstrating the importance of spatially resolved diagnostics for practical optimization of ribbon-type ion sources.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 on","pages":"462 - 471"},"PeriodicalIF":1.0,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40042-026-01650-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Convective instability in a ferrofluid-saturated Darcy–Brinkman porous layer with magnetic-field-dependent viscosity and permeable magnetic boundaries","authors":"Pankaj Kumar,&nbsp;Abhishek Thakur,&nbsp;Awneesh Kumar","doi":"10.1007/s40042-026-01649-x","DOIUrl":"10.1007/s40042-026-01649-x","url":null,"abstract":"<div><p>This study examines the onset of thermal instability in a horizontal ferrofluid layer saturating a Darcy–Brinkman porous medium. The ferrofluid layer is confined between fluid-permeable, magnetically responsive boundaries and subjected to a uniform vertical magnetic field. A novel aspect of this work is the explicit incorporation of magnetically permeable boundary conditions along with magnetic-field-dependent (MFD) viscosity and porous resistance, enabling effective control of ferrofluid convection. A linear stability analysis based on the normal mode approach is employed to derive the associated eigenvalue problem, and the validity of the principle of exchange of stability is established. The critical Rayleigh number is then obtained using a single-term Galerkin method. The analysis revealed that an increase in MFD viscosity and magnetic susceptibility delays the onset of convection, whereas higher values of the magnetic buoyancy parameter <span>( (M_1) )</span> and medium permeability <span>( (k_0) )</span> promote instability. The nonlinear magnetization parameter <span>((M_3))</span> exhibits a dual influence, acting as a destabilizing factor for weak viscosity variation but contributing to stabilization as magnetic effects on viscosity become stronger. A transition in the nature of magnetically permeable boundaries from free to rigid significantly enhances system stability, with the rigid–rigid configuration being the most stable. The influence of <span>(M_1)</span> and <span>(M_3)</span> on the characteristic size of convection cells is also examined. The study provides useful physical insight into the control of ferrofluid convection with relevance to thermal management applications.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 4","pages":"416 - 432"},"PeriodicalIF":1.0,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148704216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Revisiting the extra-dimensional axion potential","authors":"Chang Hyeon Lee,&nbsp;Chang Sub Shin","doi":"10.1007/s40042-026-01644-2","DOIUrl":"10.1007/s40042-026-01644-2","url":null,"abstract":"<div><p>The axion solution to the strong CP problem requires the Peccei–Quinn (PQ) symmetry to be of extremely high quality, so that the vacuum QCD angle satisfies <span>(|bar{theta }|lesssim 10^{-10})</span>. In many extra-dimensional axion models, this quality is protected because explicit PQ breaking is effectively nonlocal: it is communicated through the bulk only via effects that probe the whole compact dimension, leading to exponential suppression. There is a similar but different type of axion model, in which PQ symmetry is broken explicitly and locally on the UV brane, yet a parametrically light pseudoscalar mode can appear in the KK spectrum due to warped localization. This invites a nontrivial question: does a light KK mode necessarily imply that the PQ symmetry is of high quality in the vacuum relevant for QCD? We address this by formulating the vacuum problem in terms of boundary angular variables. Instead of focusing solely on a single propagating KK eigenmode near a chosen background, we compute the axion-dependent vacuum energy over the full <span>(2pi )</span> range by treating the UV and IR boundary phases as two compact angular fields. Bulk dynamics then induces a monodromy-like “stiffness” that energetically correlates the two boundary angles, while QCD provides an additional periodic potential for the IR angle. This two-angle description provides a direct and systematic criterion to assess PQ quality in the strong-CP vacuum, and clarifies how the global potential structure can differ from the intuition based only on the quadratic KK spectrum.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 2","pages":"131 - 140"},"PeriodicalIF":1.0,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148366102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Observation of photoreflectance spectra of MAPbBr(_{3}) single crystal","authors":"Behnam Zeinalvand Farzin,&nbsp;Taein Kang,&nbsp;Sung Yeop Kim,&nbsp;Jong Su Kim,&nbsp;Mee-Yi Ryu,&nbsp;Mun Seok Jeong,&nbsp;Chang-Lyoul Lee","doi":"10.1007/s40042-026-01615-7","DOIUrl":"10.1007/s40042-026-01615-7","url":null,"abstract":"<div><p>We report the first observation of photoreflectance (PR) spectra in MAPbBr<span>(_{3})</span> single crystals and systematically investigate their optical properties using photoluminescence (PL) and PR spectroscopies. High-quality MAPbBr<span>(_{3})</span> single crystals were grown by the seed-induced inverse temperature crystallization method. Low-temperature PL measurements reveal four emission peaks at 2.09, 2.14, 2.17, and 2.20 eV. The 2.20 eV emission is attributed to free-exciton (FE) recombination, while the 2.14 and 2.17 eV peaks originate from bound-exciton (BE) recombination. The lowest-energy emission at 2.09 eV is associated with defect-related states in the orthorhombic phase. With increasing temperature, all PL emissions exhibit a blueshift, which is attributed to a thermally induced structural phase transition from the orthorhombic to the tetragonal phase occurring near 140 K. Consistent with the PL results, low-temperature PR measurements show a transition at 2.20 eV, corresponding to the FE-related band-to-band transition. The PR transition energy exhibits a blueshift with increasing temperature from 24 to 140 K, followed by a redshift between 140 and 180 K, reflecting the orthorhombic-to-tetragonal phase transition. Electron–phonon interactions primarily govern the temperature-dependent energy shifts observed in both PL and PR spectra. Notably, the transition energies obtained from PR are higher than those from PL, which is attributed to the surface-sensitive band-to-band transitions probed by PR. The excellent agreement between PL and PR results confirms the reliability of the PR measurements and provides a comprehensive understanding of the excitonic and band-edge properties of MAPbBr<span>(_{3})</span> single crystals.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 2","pages":"157 - 164"},"PeriodicalIF":1.0,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148366106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the (^{13})N((alpha , p))(^{16})O reaction rates via the (^{19})F(p, t)(^{17})F reaction","authors":"Sohyun Kim,&nbsp;Kyungyuk Chae,&nbsp;Chanhee Kim,&nbsp;Sunghoon Ahn,&nbsp;Soomi Cha,&nbsp;Jungwoo Lee,&nbsp;Minju Kim,&nbsp;Zifeng Luo,&nbsp;Masato Asai,&nbsp;Kentaro Hirose,&nbsp;Testuya K. Sato,&nbsp;Hiroyuki Makii,&nbsp;Katsuhisa Nishio,&nbsp;Riccardo Orlandi,&nbsp;James Smallcombe,&nbsp;Fumi Suzaki,&nbsp;Taiki Tanaka,&nbsp;Yuta Ito,&nbsp;Sunghan Bae,&nbsp;Fulong Liu,&nbsp;Hidetoshi Yamaguchi,&nbsp;Shigeru Kubono,&nbsp;Minjeong Choi,&nbsp;Nicoleta M. Florea,&nbsp;Daniel Tofan,&nbsp;Gyoungmo Gu,&nbsp;Cheolmin Ham,&nbsp;Dong Geon Kim,&nbsp;Minsik Kwag,&nbsp;Geonhee Oh","doi":"10.1007/s40042-026-01643-3","DOIUrl":"10.1007/s40042-026-01643-3","url":null,"abstract":"<div><p>Recent sensitivity studies have shown that nucleosynthesis in Core-collapse supernovae (CCSNe) is significantly influenced by the <span>(^{13})</span>N(<span>(alpha , p)</span>)<span>(^{16})</span>O reaction rate. However, the reaction rate at stellar temperatures (up to 4 GK) remains poorly constrained, primarily due to the limited knowledge of the decay properties of relevant <span>(^{17})</span>F resonances above the <span>(alpha )</span> threshold at 5.819 MeV. To improve these constraints, we performed the <span>(^{19})</span>F(<span>(p, t)^{17})</span>F transfer reaction experiment aimed at refining the <span>(^{13})</span>N(<span>(alpha , p)</span>)<span>(^{16})</span>O rate. The experiment was performed at the tandem accelerator facility of the Japan Atomic Energy Agency using 30.5-MeV proton beams incident on CaF<span>(_2)</span> targets backed with gold. Recoiling tritons from the <span>(^{19})</span>F(<span>(p, t)^{17})</span>F reaction were detected with segmented silicon detector arrays. The triton energy spectra revealed several low-lying <span>(^{17})</span>F states, and angular distributions were analyzed using finite-range Distorted Wave Born Approximation (DWBA) calculations with multiple optical-model parameter sets. Proton and <span>(alpha )</span> decay channels associated with specific <span>(^{17})</span>F resonances were clearly identified, which will allow us to determine the branching ratios. The optimized optical potentials and measured decay yields will provide direct experimental constraints on the <span>(alpha )</span>- and proton-partial widths (<span>(Gamma _alpha )</span>, <span>(Gamma _p)</span>) of <span>(^{17})</span>F levels in the Gamow window (<span>(E_x)</span> = 6–9.5 MeV). The resulting resonance parameters will enable a more reliable determination of the <span>(^{13})</span>N(<span>(alpha , p)</span>)<span>(^{16})</span>O reaction rate, thereby reducing its current uncertainty in CCSNe nucleosynthesis models.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 on","pages":"488 - 493"},"PeriodicalIF":1.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of intermolecular hydrogen bonds on mesomorphism: An integrated experimental and theoretical study","authors":"Valarmathi Palanisamy,&nbsp;Saravanakumar Masan,&nbsp;Kiranisha Azhageswaran,&nbsp;Vijayakumar Vellalapalayam Nallagounder,&nbsp;Chitravel Thangaiyan,&nbsp;Balasubramanian Venkataraman","doi":"10.1007/s40042-026-01647-z","DOIUrl":"10.1007/s40042-026-01647-z","url":null,"abstract":"<div><p>Hydrogen bond liquid crystal (HBLC) complexes are isolated from the mesogenic and non-mesogenic compounds. The existence of intermolecular hydrogen bond is confirmed via various experimental results and substantiated by density functional theory (DFT) calculations. Nematic and induced smectic phases along with their corresponding textural sequences are observed along with the enthalpy values using POM and DSC. DFT calculations are employed to understand the molecular geometry of 1,3-PDA + nOBA(1:2) HBLC complexes. HOMO–LUMO explains the charge transfer behavior and the electronic stability of the molecules, which justifies the experimental band gap energy via UV–Vis spectroscopy. The global reactive parameters (GRP) describe the stability and reactivity of the molecules, whereas molecular electrostatic potential (MEP) emphasizes the reactive regions in the HBLC complexes. The interaction region indicator (IRI) and Independent Gradient Model based on Hirshfeld partition (IGMH) are used to visualize and confirm the H-bond and van der Waals interactions in the supramolecular HBLC system.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 2","pages":"182 - 197"},"PeriodicalIF":1.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148366104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated simulation of the effect of ECRH on impurity transport coefficients with neutral beam injection on EAST","authors":"Junfeng Liu,&nbsp;Yijun Zhong,&nbsp;Ji Wang,&nbsp;Xueyu Gong,&nbsp;Yuanlai Xie,&nbsp;Caichao Jiang,&nbsp;Qianhong Huang,&nbsp;Zhen Zhou,&nbsp;Yuqing Chen,&nbsp;Xingyuan Xu,&nbsp;Yousaf Khattak,&nbsp;Peng Yu,&nbsp;Hongcan Liu,&nbsp;Wangbin Liu,&nbsp;Ziqi Fan","doi":"10.1007/s40042-026-01648-y","DOIUrl":"10.1007/s40042-026-01648-y","url":null,"abstract":"<div><p>Impurity accumulation in the core dilutes the background plasma density, leading to radiative power losses and significantly degrading the confinement performance of the bulk plasma. In this work, integrated simulations are carried out using the OMFIT platform within a theoretical modeling framework to investigate electron cyclotron resonance heating (ECRH) suppression of impurity accumulation under neutral beam injection (NBI) in EAST. The influence of different impurity species (<span>({}_{{3}}^{{7}} {text{Li}})</span>, <span>({}_{{{23}}}^{{{56}}} {text{Fe,}},{}_{{{74}}}^{{{184}}} {text{W}})</span>) on transport coefficients in EAST plasmas was analyzed, along with the effects of varying neutral beam injection power levels and the with and without of electron cyclotron heating on impurity transport coefficients. The results show that, as the atomic number and atomic mass increase, the inward neoclassical convection velocity (<i>V</i>_neo) becomes larger, whereas the variation in the turbulent transport coefficient is relatively small compared to that of the neoclassical transport coefficient. This leads to a more peaked peaking factor (<i>V</i>_tot/<i>D</i>_tot), resulting in a pronounced tendency for high-Z impurities with large atomic number and mass, such as <span>({}_{{{74}}}^{{{184}}} {text{W}})</span> to accumulate in the plasma core. For the <span>({}_{{{74}}}^{{{184}}} {text{W}})</span> impurity, an increase in neutral beam injection power leads to a rise in the toroidal rotation velocity (<i>V</i>_t), which enhances the inward neoclassical convection velocity. Consequently, the total convective velocity (<i>V</i>_tot) increases, resulting in more pronounced core accumulation of <span>({}_{{{74}}}^{{{184}}} {text{W}})</span> impurities. With the injection of 4 MW of ECRH power under 4 MW of neutral beam injection power compared to without ECRH, the total diffusion coefficient (<i>D</i>_tot) of the <span>({}_{{{74}}}^{{{184}}} {text{W}})</span> impurity is significantly enhanced, and the total convective velocity is substantially reduced, resulting in a marked decrease in the peaking factor and thereby effectively suppressing core impurity accumulation. This highlights the remarkable efficacy of ECRH in suppressing core impurity accumulation.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 2","pages":"165 - 173"},"PeriodicalIF":1.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148366078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}