The European Physical Journal D最新文献

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Basis-independent coherence dynamics of tripartite states under pure dephasing 纯消相下三态的基无关相干动力学
IF 1.8 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-10-16 DOI: 10.1140/epjd/s10053-026-01272-2
Sovik Roy, Abhijit Mandal
{"title":"Basis-independent coherence dynamics of tripartite states under pure dephasing","authors":"Sovik Roy,&nbsp;Abhijit Mandal","doi":"10.1140/epjd/s10053-026-01272-2","DOIUrl":"10.1140/epjd/s10053-026-01272-2","url":null,"abstract":"<p>Quantum coherence is a fundamental quantum resource whose preservation under environmental interactions is essential for quantum information processing. While most studies have focused on basis-dependent coherence measures, the dynamics of intrinsic coherence quantified by basis-independent measures remain largely unexplored. In this work, we investigate the dynamics of basis-independent quantum coherence for several representative tripartite pure and mixed states subjected to local and common dephasing environments in both Markovian and non-Markovian regimes. We show that Markovian local dephasing leads to state-dependent coherence degradation, whereas collective dephasing significantly enhances coherence preservation through decoherence-free sectors. More importantly, non-Markovian environments give rise to nearly frozen coherence dynamics for both pure and mixed states, demonstrating the remarkable robustness of intrinsic coherence against the dephasing environment. A comparison with the measure of relative entropy of coherence reveals that the basis-independent coherence measure exhibits substantially greater resilience and qualitatively different dynamical behaviour than its basis-dependent counterpart. These results provide new insights into the preservation of intrinsic multipartite coherence in open quantum systems and highlight basis-independent coherence as a robust quantum resource for realistic noisy quantum technologies.</p><p>Schematic overview of basis-independent coherence dynamics for tripartite pure and mixed quantum states under local and common dephasing environments, highlighting state-dependent coherence degradation in Markovian regimes and the near-freezing of coherence in non-Markovian regimes.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 10","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189573","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}
引用次数: 0
Magnetic-flux-controlled exceptional curve in a SWCNT microtoroid 单壁碳纳米管微环形中磁通控制的异常曲线
IF 1.8 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-10-16 DOI: 10.1140/epjd/s10053-026-01268-y
Fang-Yu Hong
{"title":"Magnetic-flux-controlled exceptional curve in a SWCNT microtoroid","authors":"Fang-Yu Hong","doi":"10.1140/epjd/s10053-026-01268-y","DOIUrl":"10.1140/epjd/s10053-026-01268-y","url":null,"abstract":"<p>We develop a microscopic theory for realizing flux-programmable exceptional-curve dynamics in a hybrid platform composed of a single-walled carbon nanotube (SWCNT) microtoroid and a nearby nitrogen-vacancy (NV) center. The Aharonov–Bohm flux shifts the two counterpropagating chiral cavity modes in opposite directions, while the chiral NV coupling generates directional mode conversion. By adiabatically eliminating the NV excited state in the dispersive regime, we derive flux-dependent nonreciprocal couplings <span>(J_{12}(Phi )=J_0+alpha _JPhi /Phi _0)</span> and <span>(J_{21}(Phi )=J_0-alpha _JPhi /Phi _0)</span>, which lead to an effective non-Hermitian two-mode Hamiltonian supporting an exceptional point. We demonstrate that while the exact exceptional curve requires simultaneous tuning of the coherent coupling and magnetic flux, a minimum-splitting trajectory tracked via a single flux sweep closely approaches this non-Hermitian degeneracy, manifesting itself in the transmission spectrum through mode coalescence, linewidth bifurcation, and collapse of the doublet resonance. These results provide a concrete microscopic route for engineering and probing exceptional-curve dynamics in chiral SWCNT-based quantum photonic devices.</p><p>Magnetic-flux-controlled exceptional curve in a SWCNT microtoroidMagnetic-flux-controlled exceptional curve in a SWCNT microtoroid</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 10","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189671","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}
引用次数: 0
Design of an X-band low-magnetic field high-power microwave radiation source based on the synergistic design of cascaded bunching cavities and a non-uniform output cavity 基于级联聚束腔与非均匀输出腔协同设计的x波段低磁场大功率微波辐射源设计
IF 1.8 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-10-12 DOI: 10.1140/epjd/s10053-026-01260-6
Tengfang Wang, Yiming Zhong, Ziyuan Chi, Jinchuan Ju, Wei Zhang, Zihan Li, Tianzhen Zhao, Jiyao Di
{"title":"Design of an X-band low-magnetic field high-power microwave radiation source based on the synergistic design of cascaded bunching cavities and a non-uniform output cavity","authors":"Tengfang Wang,&nbsp;Yiming Zhong,&nbsp;Ziyuan Chi,&nbsp;Jinchuan Ju,&nbsp;Wei Zhang,&nbsp;Zihan Li,&nbsp;Tianzhen Zhao,&nbsp;Jiyao Di","doi":"10.1140/epjd/s10053-026-01260-6","DOIUrl":"10.1140/epjd/s10053-026-01260-6","url":null,"abstract":"<div><p>The klystron amplifier driven by an intense relativistic electron beam (IREB) is a crucial technological approach for generating high-power microwave (HPM) radiation. However, a fundamental conflict exists between low-magnetic-field operation and high-power output: increasing the radiation power requires enhancing the beam power and modulation depth, which imposes stringent demands on both the guiding magnetic field strength and the device’s power handling capacity. To address this conflict, this paper optimizes the design of a coaxial multi-beam relativistic klystron amplifier by focusing on the beam-wave interaction process between the IREB and the high-frequency structure. Through the synergistic design of cascaded single-gap bunching cavities and a non-uniform output cavity, simultaneous improvements in electron beam modulation depth and microwave extraction efficiency are achieved. Three-dimensional PIC simulation results show that under the conditions of an injection power of 19.7 kW, a guiding magnetic field of 0.37 T, a beam voltage of 780 kV, and a beam current of 13 kA, the device generates HPM radiation with an output power of 3.97 GW, an efficiency of 39.2%, and a gain of approximately 53 dB. Parameter sensitivity analyses demonstrate typical amplifier characteristics and stable operation under low magnetic field conditions. The results offer a potential new technical path for the development of compact HPM radiation sources.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 10","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189259","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}
引用次数: 0
Ultrafast coherent excitation control and nanometer-scale imaging: a conceptual design integrating FEL interference modulation with electron probing 超快相干激励控制和纳米级成像:一种集成FEL干涉调制和电子探测的概念设计
IF 1.8 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-10-12 DOI: 10.1140/epjd/s10053-026-01270-4
Jian Gao, Anzhou Yang, Qixuan Yuan, Xia Yang, Dongfang Zhang, Yinpeng Zhong
{"title":"Ultrafast coherent excitation control and nanometer-scale imaging: a conceptual design integrating FEL interference modulation with electron probing","authors":"Jian Gao,&nbsp;Anzhou Yang,&nbsp;Qixuan Yuan,&nbsp;Xia Yang,&nbsp;Dongfang Zhang,&nbsp;Yinpeng Zhong","doi":"10.1140/epjd/s10053-026-01270-4","DOIUrl":"10.1140/epjd/s10053-026-01270-4","url":null,"abstract":"<p>This work proposes a system integration framework and conceptual design that synergizes Free-Electron Laser (FEL)-induced transient gratings with ultrafast electron beam probing to explore non-equilibrium dynamics. Leveraging the extreme ultraviolet (EUV) wavelength, high coherence, and element-selective resonant FEL excitation combined with broadband electron imaging of post-excitation dynamics of the Shenzhen Superconducting Soft X-ray Free-Electron Laser (S<sup>3</sup>FEL), we present an instrument coupling scheme governed by an adaptive grating phase-matching law to establish coherent transient gratings (<span>({Lambda}_{text{T}text{G}}approx 14-49 text{n}text{m})</span>). This setup is designed to access high-momentum (<span>(q)</span>) excitations that are kinematically inaccessible to conventional optical techniques, offering a prospective platform for exploring collective electronic orders—such as polarons and photo-ionized Charge Density Waves (CDWs)—at the nanometer scale. By targeting nanoscale spatial regimes (<span>(approx 20 nm)</span>), the scheme provides a promising framework for potential future studies on the transition from classical diffusion to phase-coherent transport and element-resolved proximal spin exchange. To detect these transient states under realistic constraints, the platform integrates a THz-driven compact electron gun operating consistently at a 1.5 keV baseline. Utilizing particle tracking and electron-optics simulations, we model the far-field non-coherent deflection mapping and real-space intensity modulation of a compressed 49 fs electron probe across a 10 <span>(upmu text{m})</span> field of view, successfully resolving the spatiotemporal mismatch and coherence budget limitations. These comprehensive simulations validate the technical feasibility of the proposed cooperative instrumentation path, providing a self-consistent theoretical foundation for future experimental realization dedicated to mapping many-body interactions across mesoscopic scales.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 10","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188992","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}
引用次数: 0
Noise-aware derivative feedback of a harmonic oscillator under quantum-limited position measurement 量子受限位置测量下谐振子的噪声感知导数反馈
IF 1.8 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-10-10 DOI: 10.1140/epjd/s10053-026-01271-3
Vedran Vujnović
{"title":"Noise-aware derivative feedback of a harmonic oscillator under quantum-limited position measurement","authors":"Vedran Vujnović","doi":"10.1140/epjd/s10053-026-01271-3","DOIUrl":"10.1140/epjd/s10053-026-01271-3","url":null,"abstract":"<p>We study measurement-based feedback control of a damped harmonic oscillator, motivated by optomechanical and interferometric position measurements, in which the feedback force is synthesized directly from a displacement measurement. For a band-limited derivative (“dirty-derivative”) controller, the feedback loop simultaneously shapes the mechanical susceptibility and reinjects measurement noise back onto the oscillator, creating a nontrivial tradeoff between stabilization and noise amplification. We first present a compact classical formulation that isolates this tradeoff in the closed-loop displacement spectrum and identifies the controller parameters that determine resonance suppression versus noise-driven actuation. We then extend the same topology to a quantum-limited position detector, enforcing the imprecision–backaction constraint and introducing a finite measurement bandwidth that both regularizes high-frequency noise reinjection and adds phase lag in the feedback path. In the high-<i>Q</i> regime, we obtain a compact analytic design rule for the optimal feedback gain at fixed controller and measurement bandwidths and compare it directly with full-spectrum calculations. The comparison shows that a high mechanical quality factor alone does not guarantee quantitative agreement: the accuracy of the near-resonant approximation also depends strongly on the controller and measurement bandwidths. Because finite measurement bandwidth changes both the magnitude and phase of the feedback loop, the analysis separates the near-resonant damping contribution from imprecision-noise reinjection and shows that positive near-resonant feedback damping requires the product of the controller cutoff and measurement bandwidth to exceed the square of the mechanical resonance frequency. Finally, we present a dimensionless map of the gain-optimized high-<i>Q</i> occupation and compare its predictions with full-spectrum optimization. All analytical gains evaluated in this map satisfy the full closed-loop stability criterion for the stated parameters.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 10","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189355","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}
引用次数: 0
Photoexcitation of low-energy transitions in (^{229})Th by a Laguerre–Gaussian beam 拉盖尔-高斯光束对(^{229}) Th中低能跃迁的光激发
IF 1.8 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-10-08 DOI: 10.1140/epjd/s10053-026-01259-z
N. A. Ashurko, O. V. Bogdanov, Y. Wang
{"title":"Photoexcitation of low-energy transitions in (^{229})Th by a Laguerre–Gaussian beam","authors":"N. A. Ashurko,&nbsp;O. V. Bogdanov,&nbsp;Y. Wang","doi":"10.1140/epjd/s10053-026-01259-z","DOIUrl":"10.1140/epjd/s10053-026-01259-z","url":null,"abstract":"<p>The photoexcitation of low-energy nuclear transitions by twisted photons carrying orbital angular momentum and described by Laguerre–Gaussian modes has been theoretically investigated. An analytical expression for the absorption probability is derived that explicitly incorporates <span>(sigma _perp )</span> and <span>(sigma _3)</span> are the half-widths of the photon momentum distributions in the transverse <span>(k_perp )</span> and longitudinal <span>(k_3)</span> directions in momentum space, as well as the radial index <span>(n_gamma )</span> and the helicity <span>(lambda )</span> of the beam. Numerical calculations are performed for the unique isomeric transition in the <span>(^{229}textrm{Th})</span> nucleus with an energy of 8.338 eV, which represents a mixture of M1 and E2 multipolarities. The ratio of the E2 channel excitation probabilities for LG and Bessel beams, as well as the conditions under which the LG mode becomes more efficient, is analyzed.</p><p>\"The configuration of the Laguerre -Gaussian beam with respect to the atomic nucleus <span>(^{229})</span>Th\"</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 10","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132825","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}
引用次数: 0
Hybrid scheme of positron photoproduction for Siberian Ring Photon Source facility 西伯利亚环光子源装置正电子产光的混合方案
IF 1.8 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-10-08 DOI: 10.1140/epjd/s10053-026-01263-3
S. V. Abdrashitov, O. V. Bogdanov, S. V. Bragin
{"title":"Hybrid scheme of positron photoproduction for Siberian Ring Photon Source facility","authors":"S. V. Abdrashitov,&nbsp;O. V. Bogdanov,&nbsp;S. V. Bragin","doi":"10.1140/epjd/s10053-026-01263-3","DOIUrl":"10.1140/epjd/s10053-026-01263-3","url":null,"abstract":"<p>Numerical simulation of a positron source for the SKIF accelerator complex (Siberian Ring Photon Source) has been performed. The scheme employs a primary 200 MeV electron beam to generate photons in a crystalline target (radiator), followed by electron-positron pair production in an amorphous target (converter) — a configuration known as the hybrid positron source scheme. A diamond crystal is considered as the radiator for the generation of coherent bremsstrahlung. Amorphous tungsten W is chosen as the converter. Energy spectra of positrons produced in a thin converter are obtained. Positron energy losses and radiation attenuation within the converter bulk are taken into account in order to determine the optimal converter thicknesses providing the maximum total positron yield when using a diamond radiator for coherent bremsstrahlung. Energy spectra of positrons at the optimal converter thickness are calculated. A comparison with incoherent bremsstrahlung is carried out.</p><p>The caption for the graphical abstract is: Hybrid scheme of a positron source</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 10","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132527","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}
引用次数: 0
On the existence and propagation of ion-acoustic soliton–cnoidal waves in a nonthermal plasma 非热等离子体中离子声孤子-余弦波的存在与传播
IF 1.8 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-10-08 DOI: 10.1140/epjd/s10053-026-01253-5
Weaam Alhejaili, Shahida Parveen, Shahzad Mahmood, Samir A. El-Tantawy
{"title":"On the existence and propagation of ion-acoustic soliton–cnoidal waves in a nonthermal plasma","authors":"Weaam Alhejaili,&nbsp;Shahida Parveen,&nbsp;Shahzad Mahmood,&nbsp;Samir A. El-Tantawy","doi":"10.1140/epjd/s10053-026-01253-5","DOIUrl":"10.1140/epjd/s10053-026-01253-5","url":null,"abstract":"<p>This work investigates the existence and propagation of ion-acoustic (IA) soliton–cnoidal waves in an unmagnetized multi-ion plasma consisting of warm light positive ions (H<span>(^{+})</span>), cold heavy ions (O<span>(^{+})</span> or O<span>(^{-})</span>), and inertialess <span>(kappa )</span>-distributed electrons. Motivated by space and laboratory environments where multi-ion compositions and superthermal particle populations are routinely observed, we formulate a fluid-Poisson model for two representative configurations, namely <span>(H^{+}-O^{+}-e^{-})</span> and <span>(H^{+}-O^{-}-e^{-})</span> plasma models. By applying the reductive perturbation technique to the normalized one-dimensional fluid equations, the dynamics of small-but-finite-amplitude IA perturbations is reduced to a planar Korteweg–e Vries (KdV) equation. The nonlinear and dispersive coefficients of the KdV model are expressed in terms of the electron concentration, the electron superthermality, and the light-ion-to-electron temperature ratio. A truncated Painlevé expansion is then employed to construct exact solutions of the planar KdV equation, including solitary waves, cnoidal periodic waves, and mixed soliton–cnoidal structures describing a localized IA soliton embedded in a finite-amplitude periodic background. These dressed structures behave as quasi-solitons or quasi-nanopterons, with a localized core and weak oscillatory tails, and reduce to the classical KdV soliton in the appropriate limiting regime. It is shown that the <span>(H^{+}-O^{+}-e^{-})</span> plasma model supports only compressive IA structures, whereas the <span>(H^{+}-O^{-}-e^{-})</span> plasma model can sustain both compressive and rarefactive waves, depending on the composition and parameter regime. A systematic parametric study reveals how superthermality, electron concentration, and the temperature ratio together control the amplitude, width, polarity, and phase shift of soliton–cnoidal waves, as well as the associated cnoidal and solitary components, for both plasma models. The space-time evolution of the dressed solutions clearly demonstrates elastic-type interactions between the localized soliton and the surrounding cnoidal wave train, accompanied by a finite phase shift of the periodic component. These findings bear directly on coherent structures observed by Cluster or FAST satellites, clarifying nonlinear transport in which superthermal electrons amplify wave amplitude toward Maxwellian limits.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 10","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132826","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}
引用次数: 0
Nonlinear control of dust-acoustic solitary waves in a warm dusty plasma with nonextensive electrons and nonthermal ions 含非扩展电子和非热离子的热尘埃等离子体中尘埃声孤波的非线性控制
IF 1.8 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-10-07 DOI: 10.1140/epjd/s10053-026-01258-0
Monmohan Gogoi
{"title":"Nonlinear control of dust-acoustic solitary waves in a warm dusty plasma with nonextensive electrons and nonthermal ions","authors":"Monmohan Gogoi","doi":"10.1140/epjd/s10053-026-01258-0","DOIUrl":"10.1140/epjd/s10053-026-01258-0","url":null,"abstract":"<p>Dust-acoustic solitary waves in warm dusty plasmas are strongly influenced by the non-Maxwellian response of electrons and ions and by the equilibrium composition of the plasma. Here, we investigate nonlinear dust-acoustic structures in an unmagnetized plasma containing inertial negatively charged warm dust grains, Tsallis-distributed electrons, and Cairns-distributed ions. A reductive perturbation analysis is developed to obtain the leading Korteweg–de Vries (KdV) response, while higher order nonlinear effects are quantified from the nonlinear Poisson/Sagdeev expansion. The resulting coefficient framework is evaluated over 17,298 combinations of electron nonextensivity <span>(q)</span>, ion nonthermality <span>(delta )</span>, and normalized electron concentration <span>({mu}_{e})</span>, with the dust thermal parameter fixed at <span>(sigma =0.10)</span>. The effective quadratic nonlinear coefficient remains positive throughout the investigated parameter domain, yielding a negative KdV nonlinear coefficient and a single rarefactive solitary-wave branch. Sensitivity analysis identifies <span>({mu}_{e}&gt;delta &gt;q)</span> as the dominant hierarchy for the leading nonlinear response, whereas the higher order response follows <span>(delta &gt;{mu}_{e}&gt;q)</span>. The higher order contribution remains finite but does not produce a leading order nonlinear transition within the investigated parameter range. Finally, an independent Sagdeev pseudopotential analysis demonstrates convergence of the KdV solitary-wave amplitude to the fully nonlinear solution as ΔM/V→0, with the median amplitude deviation remaining below 0.4% for ΔM/V ≤ 10<sup>−2</sup>. These results establish a quantitative connection between plasma composition, nonlinear response, and the validity of weakly nonlinear dust-acoustic solitary-wave solutions.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 10","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098818","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}
引用次数: 0
Positron channeling in quasi-mosaic bent crystals: atomistic simulations vs. experiment 准镶嵌弯曲晶体中的正电子通道:原子模拟与实验
IF 1.8 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-10-05 DOI: 10.1140/epjd/s10053-026-01257-1
Maykel Márquez-Mijares, Germán Rojas-Lorenzo, Paulo E. Ibañez-Almaguer, Jesús Rubayo-Soneira, Andrey V. Solov’yov
{"title":"Positron channeling in quasi-mosaic bent crystals: atomistic simulations vs. experiment","authors":"Maykel Márquez-Mijares,&nbsp;Germán Rojas-Lorenzo,&nbsp;Paulo E. Ibañez-Almaguer,&nbsp;Jesús Rubayo-Soneira,&nbsp;Andrey V. Solov’yov","doi":"10.1140/epjd/s10053-026-01257-1","DOIUrl":"10.1140/epjd/s10053-026-01257-1","url":null,"abstract":"<p>This paper presents the results of a comprehensive study of an ultra-relativistic positron beam deflection by an oriented quasi-mosaic crystal. The analysis was performed for the positron energy of 530 MeV incident on the quasi-mosaic bent Si(111) crystal. This particular case was chosen because it has recently been studied experimentally at the Mainz Microtron MAMI. The results of the relativistic molecular dynamics simulations were compared with the experimental observations, revealing a high degree of agreement. The study examined the presence of planar channeling, de-channeling, volume reflection, and volume capture processes in the angular distribution of deflected positrons for various beam-crystal alignments. Predictions have been made for certain crystal orientations for which there is no experimental data. Our simulations have also focused on analysing the influence of the anticlastic deformation of the bent crystal on the beam deflection by an oriented quasi-mosaic crystals.</p><p>Graphical Abstract caption: Schematic representation of the geometry of a ‘quasi-mosaic’ bent crystal slab and its orientation with respect to an incident beam.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 10","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098431","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}
引用次数: 0
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