Physica C-superconductivity and Its Applications最新文献

{"title":"Elastoplastic contact behavior of multi-stage superconducting cables under tension","authors":"Zhiwen Zhou,&nbsp;Sitongyan Li,&nbsp;Zhiwen Gao","doi":"10.1016/j.physc.2025.1354727","DOIUrl":"10.1016/j.physc.2025.1354727","url":null,"abstract":"<div><div>The superconductor cable with multi-stage twisted strands is a key component in the International Thermonuclear Experimental Reactor. These superconducting strands are composite materials with a complex microstructure. In the study, an elastoplastic constitutive model incorporating both isotropic and kinematic hardening is established to investigate the mechanical properties of the strands. The model is implemented as a user-defined material subroutine (UMAT) in the commercial finite element code ABAQUS using the fully implicit backward Euler method. Based on the analysis of the elastoplastic properties of the strands, a numerical contact model is developed to predict the contact characteristics of the multi-stage superconducting cable. The influence of helical pitch on the contact characteristics is examined by integrating the elastoplastic constitutive relations of the strands with their hierarchical helical structures. Numerical results demonstrate that the proposed model accurately describes the contact characteristics of the multi-stage superconducting cable. It is noteworthy that the elastoplastic contact force is found to be smaller than the elastic contact force. This elastoplastic contact model can be effectively used to predict the degradation of critical current in the multi-stage superconducting cable due to tensile loads.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354727"},"PeriodicalIF":1.3,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Praseodymium doping effect on the superconducting properties of FeSe0.5Te0.5 bulks under ambient and high-pressure growth conditions","authors":"Priya Singh ,&nbsp;Manasa Manasa ,&nbsp;Mohammad Azam ,&nbsp;Tatiana Zajarniuk ,&nbsp;Svitlana Stelmakh ,&nbsp;Taras Palasyuk ,&nbsp;Jan Mizeracki ,&nbsp;Tomasz Cetner ,&nbsp;Andrzej Morawski ,&nbsp;Cezariusz Jastrzębski ,&nbsp;Michał Wierzbicki ,&nbsp;Shiv J. Singh","doi":"10.1016/j.physc.2025.1354729","DOIUrl":"10.1016/j.physc.2025.1354729","url":null,"abstract":"<div><div>A series of Pr-doped FeSe_0.5Te_0.5 (Fe_1-<em>_x</em>Pr<em>_x</em>Se_0.5Te_0.5; <em>x</em> = 0 to 0.3) bulks are prepared by conventional synthesis process at ambient pressure (CSP), and high gas pressure and high temperature synthesis (HP-HTS) methods. These bulks are well characterized by structural and microstructural analysis, Raman spectroscopy, transport, and magnetic measurements. The HP-HTS process of the parent bulks has enhanced the onset transition temperature (<em>T_c^onset</em>) by 1.5 K and the critical current density (<em>J_c</em>) by two orders of magnitude compared to the CSP method. Pr-doped FeSe_0.5Te_0.5 up to 10 % doping content prepared, either CSP or HP-HTS, slightly increases the unit cell volume, and high-pressure growth produces an almost pure superconducting phase, which confirms the successful Pr-doping at Fe sites. Raman spectroscopy measurements and DFT calculations suggest the substitution of Pr-atoms in the interlayer spacing of Fe(Se,Te) lattice. High-pressure growth of Fe_1-<em>_x</em>Pr<em>_x</em>Se_0.5Te_0.5 also makes the sample less dense compared to the parent sample grown by HP-HTS. Transport and magnetic measurements depict that <em>T_c^onset</em> is almost unaffected by Pr-doping, whereas <em>J_c</em> of Pr-doped FeSe_0.5Te_0.5 is enhanced by one order of magnitude relative to the parent sample developed by CSP but lower than that of the parent sample grown by HP-HTS. Hence, Pr- doping at Fe sites preserves <em>T_c^onset</em> and improves <em>J_c</em> of FeSe_0.5Te_0.5 regardless of the doping contents and growth conditions. These results are promising for the practical application of iron-based superconductors to improve <em>J_c</em> properties without affecting <em>T_c^onset</em> through CSP process and congruent with discoveries from other superconductors, like cuprates and MgB₂.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354729"},"PeriodicalIF":1.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Effect of doping on spin density wave & superconductivity in electron-doped iron Pnictide superconductors","authors":"Santosh Kumar Barik ,&nbsp;Barada Priyadarsini Tarai ,&nbsp;Basanta Kumar Sahoo ,&nbsp;Bibekananda Panda","doi":"10.1016/j.physc.2025.1354705","DOIUrl":"10.1016/j.physc.2025.1354705","url":null,"abstract":"<div><div>We formulate a Hamiltonian model to investigate the effects of doping on superconductivity and spin density wave in electron-doped iron pnictide superconductors. The model, which is based on the BCS mechanism, employs a mean-field approach. The equations of motion for single-particle electron Green’s functions are derived from Zubarev type electron Green’s function. Single-particle correlation functions were derived by analysing the quasi-particle energies. The superconducting (SC) gap (z), spin density wave (SDW) gap (h) and chemical potential (<span><math><mi>μ</mi></math></span>) were determined self-consistently and numerically for various dopant concentrations (x). The results indicate that as doping levels increase, the SDW gradually weakens, leading to the onset of superconductivity. In the doping range <span><math><mrow><mi>x</mi><mo>=</mo><mn>0</mn><mo>.</mo><mn>045</mn><mo>−</mo><mn>0</mn><mo>.</mo><mn>06</mn></mrow></math></span>, a coexistence of the SDW and superconductivity is observed. Further doping results in the suppression of the spin density wave, accompanied by a rise in the superconducting critical temperature, which reach 26 K at <span><math><mrow><mi>x</mi><mo>=</mo><mn>0</mn><mo>.</mo><mn>07</mn></mrow></math></span>. The phase diagram depicting the relationship between the SDW Neel Temperature, SC critical temperature and doping parameter agrees well with experimental observations.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354705"},"PeriodicalIF":1.3,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Dependence of the energy and orbital structure of local states in CuO monolayer on Coulomb parameters","authors":"I.A. Makarov,&nbsp;M.M. Korshunov,&nbsp;S.G. Ovchinnikov","doi":"10.1016/j.physc.2025.1354706","DOIUrl":"10.1016/j.physc.2025.1354706","url":null,"abstract":"<div><div>The dependence of the energies and orbital structure of local states in the CuO monolayer on intra- and interatomic Coulomb interactions on copper and oxygen orbitals is studied. The electronic system is described within the eight-band <span><math><mrow><mi>p</mi><mo>−</mo><mi>d</mi></mrow></math></span> model in the hole representation with the on-site energies and hopping integrals obtained using density functional theory. CuO cluster multiparticle eigenstates are calculated using exact diagonalization. The difference between the energy dependencies on the Coulomb parameters for the states with the predominant probability density on the <span><math><mi>d</mi></math></span>-orbital and the states in which hole occupies <span><math><mi>p</mi></math></span>-orbitals leads to crossover of <span><math><mi>d</mi></math></span>- and <span><math><mi>p</mi></math></span>-states. The ground single-hole and two-hole states which determine the electronic structure of the low-energy excitations have the character of <span><math><mi>d</mi></math></span>- or <span><math><mi>p</mi></math></span>-orbitals in the different regions of the Coulomb parameters space. The gap between the energies of the dispersionless quasiparticles forming the top of the valence band and conductivity band also have different values in these two regions. The magnitude of this gap and the orbital character of the local multiparticle states change sharply even with an insignificant change in the Coulomb interactions within the boundary region of parameters between the regions in which the local states are formed by the <span><math><mi>d</mi></math></span>- or <span><math><mi>p</mi></math></span>-orbitals.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354706"},"PeriodicalIF":1.3,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"The foot, the fan, and the cuprate phase diagram: Fermi-volume-changing quantum phase transitions","authors":"Subir Sachdev","doi":"10.1016/j.physc.2025.1354707","DOIUrl":"10.1016/j.physc.2025.1354707","url":null,"abstract":"<div><div>A Fermi liquid with a ‘large’ Fermi surface (FL) can have a quantum phase transition to a spin density wave state (SDW) with reconstructed ‘small’ Fermi pockets. Both FL and SDW phases obey the Luttinger constraints on the volume enclosed by the Fermi surfaces. Critical spin fluctuations lead to spin-singlet <span><math><mi>d</mi></math></span>-wave pairing, as observed in the cuprates. Studies of the influence of spatial disorder on the FL-SDW quantum phase transition predict an extended quantum-critical Griffiths-type phase at low temperatures on the large Fermi surface side. These computations agree with the ‘foot’ of strange metal transport, and recent low temperature neutron scattering observations on La<span><math><msub><mrow></mrow><mrow><mn>2</mn><mo>−</mo><mi>x</mi></mrow></msub></math></span>Sr<span><math><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span>CuO<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span>.</div><div>However, this theory cannot explain the higher temperature pseudogap and the ‘fan’ of strange metal behavior of the hole-doped cuprates. Here we need to consider underlying Fermi-volume-changing quantum phase transitions without symmetry breaking. Then the small Fermi surface phase does not obey the Luttinger constraint, and the pseudogap metal is described by thermal fluctuations above a ‘fractionalized Fermi liquid’ (FL*) or a ‘holon metal’, with the descriptions related by a duality on a background spin liquid. The quantum critical fan is described using a field theory for an underlying FL-FL* quantum phase transition in the presence of spatial disorder. This field theory can be mapped to a form which can be analyzed using the methods of the Sachdev–Ye–Kitaev model. Such an analysis successfully models linear-in-temperature resistivity, optical conductivity and thermopower observations in the quantum critical fan.</div><div>The confinement crossover connecting these lower and higher temperature descriptions is also discussed.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354707"},"PeriodicalIF":1.3,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143839000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"A high-voltage SFQ-to-DC driver for wide-range digital SQUID magnetometer based on flux quanta counting scheme","authors":"Mengfei Zhao ,&nbsp;Yongliang Wang ,&nbsp;Pusheng Yuan ,&nbsp;Shuna Wang ,&nbsp;Lingyun Li ,&nbsp;Lixing You","doi":"10.1016/j.physc.2025.1354708","DOIUrl":"10.1016/j.physc.2025.1354708","url":null,"abstract":"<div><div>Superconducting quantum interference devices (SQUIDs) exhibit flux-modulated current–voltage characteristics and are widely used as magnetometers for ultra-low noise magnetic field measurements in biomagnetism and geophysics. Compared to the conventional flux-locked loop (FLL) readout scheme, the flux quanta counting (FQC) scheme offers a wider flux measurement range and a higher slew rate. The challenge of the FQC scheme lies in the matching of voltage levels and response speeds between the SQUID and room-temperature circuits. Typically, the FQC scheme utilizes an SFQ-to-DC converter (Q2D) for signal conversion. However, the output voltage of Q2D is only a few hundred microvolts, which prevents it from operating at high speeds and limits the slew rate of the magnetometer. Moreover, the low amplitude output of Q2D also increases the burden on the subsequent semiconductor amplifiers. Therefore, a high-voltage, high-speed SFQ-to-DC driver is essential for the application of FQC schemes. We developed an SFQ-to-DC driver with high voltage output for the asynchronous FQC scheme. This driver is designed to capture voltage pulses from the DC-SQUID and convert them into DC voltages for reading by semiconductor digital devices. The asynchronous FQC scheme based on this driver was introduced and simulated, and the quantized flux counting signal closely matches the input flux signal with a quantization error of <span><math><mrow><mn>1</mn><msub><mrow><mi>Φ</mi></mrow><mrow><mn>0</mn></mrow></msub></mrow></math></span>. The test results of the driver demonstrate an output swing of up to 6.9 mV and an operating speed of up to 15 Gbps. This is promising for the wide-range and high-slew-rate digital SQUID magnetometer for geophysics, which faces challenges in the airborne platform due to the Earth’s magnetic field.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354708"},"PeriodicalIF":1.3,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 of the superconducting solenoid for the compact laser plasma accelerator for proton therapy","authors":"Xu Zhang ,&nbsp;Kedong Wang ,&nbsp;Kai Wang ,&nbsp;Yingjie Li ,&nbsp;Jie Li ,&nbsp;Xinlin Yang ,&nbsp;Feiyu Wu ,&nbsp;Xueqing Yan ,&nbsp;Kun Zhu","doi":"10.1016/j.physc.2025.1354702","DOIUrl":"10.1016/j.physc.2025.1354702","url":null,"abstract":"<div><div>Laser plasma accelerators have become a new kind of particle accelerator in recent years. Peking University has built the world’s first compact laser plasma accelerator, CLAPA I, which has an energy of 15 MeV and can adjust its energy spread to 5%. Currently, CLAPA II is being built. Its main use is for proton therapy. The beam transport system of CLAPA II can handle proton beams with energies from 40 to 230 MeV and an energy spread of less than 5% at the end. The laser interacts with the target to create an initial proton beam that has a large spread of angles and energy. This beam is first captured and focused by three superconducting solenoids. Then, the beam is sent into horizontal and vertical beamlines for treatment. This paper focuses on the three superconducting solenoids in the beam collection section. The magnetic design was completed based on beam dynamics requirements. The central magnetic fields of the three solenoids are 7.8 T, 3.2 T, and 7.8 T, respectively. A three-dimensional magnetic field measurement platform was used to measure the integral field homogeneity and magnetic center. The integral field homogeneity meets the design requirement of <span><math><mrow><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></math></span>, confirming the magnetic design’s validity. Considering the magnetic center deviation, the alignment and installation of the three superconducting solenoids were conducted using a laser tracker, achieving an installation accuracy of less than 0.3 mm. The three superconducting solenoids are working well now, and experiments with high-power lasers impinging on the targets are about to start.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"632 ","pages":"Article 1354702"},"PeriodicalIF":1.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Modeling and analysis of torque characteristics for an axial HTS magnetic coupler","authors":"Liwang Ai ,&nbsp;Pengfei Ma ,&nbsp;Haichao Feng ,&nbsp;Siyuan Jiang ,&nbsp;Caixia Gao ,&nbsp;Xiaozhuo Xu","doi":"10.1016/j.physc.2025.1354704","DOIUrl":"10.1016/j.physc.2025.1354704","url":null,"abstract":"<div><div>The theoretical modeling of torque for an axial high-temperature superconductor (HTS) magnetic coupler (AHTSMC) is challenging due to the dual-rotor motion system with large relative displacement and the nonlinear <em>E</em>-<em>J</em> relationship of the HTS. In this paper, the models of torque calculation for AHTSMC are developed using numerical and analytical methods, and a comparative analysis is carried out to investigate the torque characteristics of AHTSMC. Firstly, the structure and operational principle of AHTSMC are described, and 2-D numerical simulations are performed based on the <strong><em>H</em></strong>-<em>φ</em> formulation. Also, experimental tests verified the simulation model. Then, the frozen-image model is improved by introducing two dipoles that represent the hysteresis of the HTS under an AC magnetic field, and by modifying the rule of frozen dipole. Based on the improved frozen-image model, the lateral force of the HTS- permanent magnets (PMs) system and the torque of the AHTSMC can be calculated. The results of the analytical calculations are basically in agreement with the numerical simulation results. Finally, the study showed that the AHTSMC can operate both asynchronously and synchronously. In asynchronous operation, the AHTSMC remains capable of transmitting torque, but there is significant fluctuation. In synchronous operation, the AHTSMC outputs a stable torque, and the magnitude of the torque is determined by the relative position angle between the PM rotor and the HTS rotor.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"632 ","pages":"Article 1354704"},"PeriodicalIF":1.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Magneto-thermal stability analysis of Nb3Sn multifilament superconducting wires in rotating magnetic fields","authors":"An He ,&nbsp;Yu Jia ,&nbsp;Wei Liu","doi":"10.1016/j.physc.2025.1354684","DOIUrl":"10.1016/j.physc.2025.1354684","url":null,"abstract":"<div><div>Superconducting wires in superconducting motors typically operate in environments with strong magnetic fields and high currents, which may trigger flux jumps accompanied by rapid temperature rises. This can lead to a decrease in the wire’s current-carrying capacity and even result in a quench. In this study, the Nb₃Sn superconducting wire, consisting of multiple superconducting filaments and copper, was modeled by constraining the net current of each filament to be zero in order to simulate the three-dimensional twisting characteristics. The magneto-thermal stability of the superconducting wire under rotating magnetic fields was investigated. The effects of the magnetic field amplitude and frequency on the flux jump behavior of the Nb₃Sn superconducting wire were analyzed. As the magnetic field amplitude increased, the frequency range of flux jumps initially increased and then decreased. We examine the effect of different ratios of rotational to alternating fields <span><math><mi>k</mi></math></span> on flux jumps. At lower frequencies, the number of flux jumps increased with <span><math><mi>k</mi></math></span>, at higher frequencies, the number of flux jumps initially increased and then decreased. Subsequently, the effects of the Cu/SC ratio and the number of filaments on flux jumps were studied. For a fixed frequency, the number of flux jumps and the temperature rise exhibited non-monotonic variations with the magnetic field amplitude. When the magnetic field amplitude fixed, both the number of flux jumps and the temperature rise decreased with increasing frequency. Finally, the variation in the number of flux jumps with the Cu/SC ratio and <span><math><mi>k</mi></math></span> was discussed.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"632 ","pages":"Article 1354684"},"PeriodicalIF":1.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Motion characteristics of a self-driven HTS bulk maglev under the composite magnetic field","authors":"Yonghai Zhao ,&nbsp;Jun Zheng ,&nbsp;Xuanbo Wang","doi":"10.1016/j.physc.2025.1354686","DOIUrl":"10.1016/j.physc.2025.1354686","url":null,"abstract":"<div><div>High temperature superconducting (HTS) maglev has the advantages of levitation-guidance integration and low magnetic resistance due to pinning effects. Currently, most HTS maglev systems adopt linear motors for propulsion, requiring the installation of the mover on the maglev vehicle and the stator on the track separately. It is potential to establish the composite pancake coil magnetic field based on permanent magnet guideway (PMG), which can bring HTS bulks the original levitation and guidance force generated and driving force. Based on the self-development micro levitation force test device, the paper explores the feasibility of using coils to drive HTS bulks. At a working height (WH) of 12 mm and a coil current of 15 A, the maximum driving force can reach 0.2 N. The driving force can be increased by reducing the WH or increasing the field cooling height (FCH). Based on the COMSOL Multiphysics software, the three-dimensional finite element simulation model of HTS bulks combined with the motion equation was established. Qualitative analysis of the free movement characteristics of the HTS bulk driven by the coils was performed, and the differences between different current directions were compared. In addition, the paper built a driving principal model to analyze the movement characteristics of HTS bulks driven by coils. Consistent with the simulation results, the levitation height increases, and positive pitch angle occurs when driven by the positive current, while the levitation height decreases, and negative pitch angle occurs when driven by the negative current.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"632 ","pages":"Article 1354686"},"PeriodicalIF":1.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}