Physica C-superconductivity and Its Applications最新文献_第3页

A high-voltage SFQ-to-DC driver for wide-range digital SQUID magnetometer based on flux quanta counting scheme 基于磁通量子计数方案的宽量程数字SQUID磁强计高压sfq - dc驱动器

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-08 DOI: 10.1016/j.physc.2025.1354708

Mengfei Zhao , Yongliang Wang , Pusheng Yuan , Shuna Wang , Lingyun Li , Lixing You

{"title":"A high-voltage SFQ-to-DC driver for wide-range digital SQUID magnetometer based on flux quanta counting scheme","authors":"Mengfei Zhao , Yongliang Wang , Pusheng Yuan , Shuna Wang , Lingyun Li , 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}

引用次数: 0

Development of the superconducting solenoid for the compact laser plasma accelerator for proton therapy 质子治疗激光等离子体加速器超导螺线管的研制

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-07 DOI: 10.1016/j.physc.2025.1354702

Xu Zhang , Kedong Wang , Kai Wang , Yingjie Li , Jie Li , Xinlin Yang , Feiyu Wu , Xueqing Yan , Kun Zhu

{"title":"Development of the superconducting solenoid for the compact laser plasma accelerator for proton therapy","authors":"Xu Zhang , Kedong Wang , Kai Wang , Yingjie Li , Jie Li , Xinlin Yang , Feiyu Wu , Xueqing Yan , 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}

引用次数: 0

Modeling and analysis of torque characteristics for an axial HTS magnetic coupler 轴向高温超导磁力耦合器转矩特性建模与分析

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-07 DOI: 10.1016/j.physc.2025.1354704

Liwang Ai , Pengfei Ma , Haichao Feng , Siyuan Jiang , Caixia Gao , Xiaozhuo Xu

{"title":"Modeling and analysis of torque characteristics for an axial HTS magnetic coupler","authors":"Liwang Ai , Pengfei Ma , Haichao Feng , Siyuan Jiang , Caixia Gao , 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}

引用次数: 0

Magneto-thermal stability analysis of Nb3Sn multifilament superconducting wires in rotating magnetic fields 旋转磁场中Nb3Sn多丝超导丝的磁热稳定性分析

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-07 DOI: 10.1016/j.physc.2025.1354684

An He , Yu Jia , Wei Liu

{"title":"Magneto-thermal stability analysis of Nb3Sn multifilament superconducting wires in rotating magnetic fields","authors":"An He , Yu Jia , 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 Nb<sub>3</sub>Sn 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 Nb<sub>3</sub>Sn 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}

引用次数: 0

Electromagnetic design and performance analysis of a 20 MW-class high temperature superconducting induction/synchronous motor for electric aircraft applications using a self-assembling design method 应用自组装设计方法对电动飞机用20mw级高温超导感应/同步电机进行电磁设计与性能分析

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-07 DOI: 10.1016/j.physc.2025.1354690

Masayoshi Yamamoto, Taketsune Nakamura

引用次数: 0

Motion characteristics of a self-driven HTS bulk maglev under the composite magnetic field 复合磁场下自驱动高温超导体磁浮的运动特性

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-07 DOI: 10.1016/j.physc.2025.1354686

Yonghai Zhao , Jun Zheng , Xuanbo Wang

{"title":"Motion characteristics of a self-driven HTS bulk maglev under the composite magnetic field","authors":"Yonghai Zhao , Jun Zheng , 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}

引用次数: 0

Enhanced stability and optimization of SMES-based deregulated power systems using the repulsive firefly algorithm 利用排斥性萤火虫算法增强基于中小企业的解除管制电力系统的稳定性和优化

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-07 DOI: 10.1016/j.physc.2025.1354692

Asit Mohanty , Sthitapragyan Mohanty , Pragyan P Mohanty , Manzoore Elahi M. Soudagar , S. Ramesh , Javed Khan Bhutto , Abdulwasa Bakr Barnawi , Erdem Cuce

{"title":"Enhanced stability and optimization of SMES-based deregulated power systems using the repulsive firefly algorithm","authors":"Asit Mohanty , Sthitapragyan Mohanty , Pragyan P Mohanty , Manzoore Elahi M. Soudagar , S. Ramesh , Javed Khan Bhutto , Abdulwasa Bakr Barnawi , Erdem Cuce","doi":"10.1016/j.physc.2025.1354692","DOIUrl":"10.1016/j.physc.2025.1354692","url":null,"abstract":"<div><div>The growing incorporation of renewable energy into deregulated power systems requires advanced hardware solutions, such as Superconducting Magnetic Energy Storage (SMES), as well as more complex control algorithms that surpass traditional Automatic Governor Control (AGC) methods based on PID or IPC techniques.</div><div>This paper introduces an innovative method utilizing the Repulsive Firefly Algorithm (RFA) for the dynamic management and optimization of a two-agent deregulated power system. The RFA, augmented with a repulsion mechanism, markedly enhances exploratory capabilities and reduces premature convergence, hence providing strong performance in extremely dynamic and uncertain grid settings. The proposed RFA-based method efficiently mitigates frequency fluctuations and optimizes power distribution across independent market entities by dynamically adjusting the control settings of the SMES and other system components. The fast response and exceptional efficiency of SMES are vital for stabilizing the power grid during fluctuations caused by renewable energy sources. Simulation results indicate that RFA surpasses traditional methods, providing enhanced control accuracy, diminished frequency fluctuations, and increased power flow stability. This study highlights the capability of RFA as a sophisticated optimization instrument for improving the resilience and efficiency of contemporary deregulated power systems that incorporate renewable energy sources.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"632 ","pages":"Article 1354692"},"PeriodicalIF":1.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791772","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}

引用次数: 0

Bending characteristics of multi-layer spiral HTS cable with large tape gap 大带隙多层螺旋高温超导电缆弯曲特性研究

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-07 DOI: 10.1016/j.physc.2025.1354691

Haosheng Ye, Xuan Zhou, Jie Sheng, Jinshan Yang, Zhijian Jin, Yue Zhao

{"title":"Bending characteristics of multi-layer spiral HTS cable with large tape gap","authors":"Haosheng Ye, Xuan Zhou, Jie Sheng, Jinshan Yang, Zhijian Jin, Yue Zhao","doi":"10.1016/j.physc.2025.1354691","DOIUrl":"10.1016/j.physc.2025.1354691","url":null,"abstract":"<div><div>Assembling high-temperature superconducting (HTS) tapes into robust cable with spiral geometry is widely adopted to achieve high current-carrying capacity and strong mechanical properties in high-field magnet applications. However, multi-layer structure of spiral HTS cable undermines its bending performance due to complex factors, which have not been comprehensively clarified yet. In this paper, the influence of the tape gap on the bending characteristics of double-layer spiral HTS cable has been investigated through both experimental and numerical methods. and we revealed a distinct mechanism of critical current degradation during bending correlated with large tape gap. Result shows that, the large tape gap, as an unneglectable geometrical irregularity, leads to the increment of the interlayer friction coefficient. Moreover, with the increase of tape gap, additional compressive strain would be imposed on tape, leading to the exacerbation of imbalance of strain distribution. Therefore, cable samples with larger tape gap exhibit inferior bending performance compared to those with smaller tape gap, and this earlier occurrence of critical current degradation during bending process is primarily manifested in the outer layer. Conclusion obtained from this paper is anticipated to assist the understanding of the mechanism of bending performance degradation, as well as the improvement of engineering production for multi-layer spiral HTS cable.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"632 ","pages":"Article 1354691"},"PeriodicalIF":1.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791771","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}

引用次数: 0

Enhanced superconductivity in non-centrosymmetric hexagonal HfRuAs 非中心对称六方HfRuAs的超导性增强

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-02 DOI: 10.1016/j.physc.2025.1354710

Lijia Zhou , Xin Chen , Guangtong Shan , Qiang Li , Xiaojun Kuang , Xianran Xing

{"title":"Enhanced superconductivity in non-centrosymmetric hexagonal HfRuAs","authors":"Lijia Zhou , Xin Chen , Guangtong Shan , Qiang Li , Xiaojun Kuang , Xianran Xing","doi":"10.1016/j.physc.2025.1354710","DOIUrl":"10.1016/j.physc.2025.1354710","url":null,"abstract":"<div><div>We report the synthesis, crystal structure, superconductivity, and physical properties of HfRuAs, a ternary equiatomic compound that can crystallize in either the TiFeSi-type orthorhombic (o’-phase) or the Fe<sub>2</sub>P-type hexagonal (h-phase) structure. Our synthesized polycrystalline samples exhibit coexistence of both two phases due to synthesis conditions. The h-phase demonstrates bulk type-II weak-coupling superconductivity with a superconducting transition temperature of approximately 7.25 K, and an upper critical field of 12.40 T. Structural refinements suggest that the expansion of Ru-Ru distances within triangular clusters may be associated with the enhancement of superconductivity in the h-phase. First-principles calculations confirm that antisymmetric spin-orbit coupling (ASOC) induces significant band splitting and opens a fully gapped superconducting state. These results indicate that h-phase HfRuAs is a promising candidate for exploring superconductivity in weakly correlated, non-centrosymmetric superconductors.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354710"},"PeriodicalIF":1.3,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791021","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}

引用次数: 0

Holographic Schwinger–Keldysh effective field theories including a non-hydrodynamic mode 包括非水动力模式的全息Schwinger-Keldysh有效场理论

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-03-29 DOI: 10.1016/j.physc.2025.1354701

Yan Liu , Ya-Wen Sun , Xin-Meng Wu

引用次数: 0