{"title":"Design Considerations for an Electromagnetic Railgun Firing Optimized Intelligent Bursts to Be Used Against an Anti-Ship Missile Using Operational Constraints","authors":"Tom Vancaeyzeele;Johan Gallant;Ben Lauwens","doi":"10.1109/TPS.2025.3616780","DOIUrl":"https://doi.org/10.1109/TPS.2025.3616780","url":null,"abstract":"Electromagnetic railguns offer more modifiable firing conditions to a fire control system than conventional guns. The fire rates can be modified during a burst of multiple shots, attaining demonstrated fire rates of 80 Hz and higher. Besides the rate of fire (RoF), obtaining muzzle velocities up to 2400 m/s—about twice the current muzzle velocity of close in weapon systems (CIWSs)—are achievable. On a ship, a CIWS such as the goalkeeper serves as the last layer of defense, using a hard-kill approach against inbound anti-ship missiles (ASMs). Using a railgun as a CIWS comes with different challenges, such as energy consumption and energy availability. The use of an intelligent burst allows multiple simultaneous impacts on the target through varying the muzzle velocity, which further improves the efficiency of a railgun against these faster threats compared to conventional weapons. In a previous study, the RoF was kept fixed. In this study, the RoF is allowed to vary within the physical limitations of the railgun. For these simulations, only one projectile could be present in the barrel at any given moment. Using introduced physical constraints combined with exploring lower initial launch velocities allows for interesting results, which—combined with imposed safety and operational constraints—allow identifying optimal intelligent burst patterns for sea-skimming missiles. Varying the lowest muzzle velocity between 300 and 1800 m/s and the intercept range from 400 to 2000 m, with maximum dynamic fire rates ranging from 100 to 400 Hz. Projectile consumptions ranging from 11 to over 600 projectiles were observed. A total success rate of 95% was imposed for feasible firing solutions. Using the engagement time and charging time allows determining the maximal engagement rate per CIWS against inbound threats, which will allow determining the maximum number of threats the CIWS can deal with in a given time span.","PeriodicalId":450,"journal":{"name":"IEEE Transactions on Plasma Science","volume":"54 4","pages":"1903-1908"},"PeriodicalIF":1.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147685300","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":"Self-Consistent Dynamic Simulations of the Charge–Discharge Cycles of a Spacecraft in Geostationary Orbit","authors":"Amandine Finot;Sébastien Hess;Julien Jarrige","doi":"10.1109/TPS.2026.3671074","DOIUrl":"https://doi.org/10.1109/TPS.2026.3671074","url":null,"abstract":"Because of their interaction with the surrounding plasma, spacecraft in operation experience high absolute and differential charging between surfaces made of different materials. Differential charging may ultimately lead to the formation of an electrostatic discharge (ESD) that equalizes the potential of the satellite and the plasma environment and, when triggered on a solar array, generates a plasma bubble that neutralizes, partially or totally, the cover glasses. Charging simulations are commonly used to evaluate the risk of ESD formation on satellites. However, as simulations do not consider the effect of ESDs, computed differential potentials on satellite can reach thousands of volts, while discharges are known to occur at lower values (typically around 500 V). This article presents the coupling between a charging model and a flashover propagation model, applied on a satellite with an 8-<inline-formula> <tex-math>$mathrm {textbf {m}^{2}}$ </tex-math></inline-formula> solar array. Simulations are presented for several charge–discharge cycles, where the flashover almost completely neutralizes the whole surface of the solar array. A parametric study is carried out to investigate the effect of the ESD ignition voltage, the environment, and the cathode spot material on the ESD occurrence frequency, the ESD duration, and the flashover current amplitude. This type of simulation can be used to further understand parameters strengthening the ESD risks.","PeriodicalId":450,"journal":{"name":"IEEE Transactions on Plasma Science","volume":"54 4","pages":"1930-1938"},"PeriodicalIF":1.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147685310","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}
Dan Chen;Yan Zhou;Zhaoxiao Wu;Yong Zheng;Yunxi Zheng;Chengxiang Li
{"title":"Influence of Copper-Ring Driver Thickness on Energy Transfer and Welding Effect of Electromagnetic Pulse Welding","authors":"Dan Chen;Yan Zhou;Zhaoxiao Wu;Yong Zheng;Yunxi Zheng;Chengxiang Li","doi":"10.1109/TPS.2026.3676422","DOIUrl":"https://doi.org/10.1109/TPS.2026.3676422","url":null,"abstract":"The rapid expansion of the nuclear power industry has intensified the demands for composite components including zircaloy and stainless steel. Driver-assisted electromagnetic pulse welding (EMPW) is a promising welding method for the fabrication of these composite components, where the driver thickness is one of the key parameters. However, current studies have not yet provided a sufficient insight of the thickness modification on the energy transfer process and welding effect. In this study, the basic principles and energy transfer process of copper-ring-driver-assisted EMPW are systematically explored. An index is proposed to quantify and predict the effect of driver thickness on the dynamic performance, where the local maximum is obtained when the thickness is equal to the skin depth of driver material. To reveal the spatial–temporal distribution of electromagnetic parameters, a multifield coupled finite-element simulation model is set. Based on the model, the energy transfer efficiency is calculated, where the optimized effect is found with driver thickness of 0.7 mm. Experiments of copper-driver-assisted EMPW are conducted subsequently with different discharge voltages and driver thicknesses for welding zircaloy tube and stainless steel rod. Mechanical properties and microstructural characterization show that, within the selected parameters, welding effect of the zircaloy–stainless steel joint are optimal with 0.7-mm driver thickness, supporting the numerical analysis. This work provides a reference for the optimization of the EMPW technology in the field of nuclear power.","PeriodicalId":450,"journal":{"name":"IEEE Transactions on Plasma Science","volume":"54 4","pages":"1411-1421"},"PeriodicalIF":1.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147685304","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}
Yiliang Lv;Ning Wang;Zhiwei Kang;Wenbo Yang;Aoming Ge
{"title":"Low-Stray-Inductance Integrated Press-Pack Technology for Multidie Reversely Switched Dynistor Stacks","authors":"Yiliang Lv;Ning Wang;Zhiwei Kang;Wenbo Yang;Aoming Ge","doi":"10.1109/TPS.2026.3655957","DOIUrl":"https://doi.org/10.1109/TPS.2026.3655957","url":null,"abstract":"To address the issues of high stray inductance, large volume, and excessive weight in conventional series-connected reversely switched dynistor (RSD) stack, this study proposes an integrated multidie press-pack technology utilizing RSD bare dies. By optimizing the structural design of the stack and directly press-packing bare dies under mechanical pressure, this technology significantly reduces the stack stray inductance while achieving miniaturization and weight reduction. Based on this approach, a 12-die series-connected integrated press-pack RSD stack was designed and manufactured. The stack exhibits an overall voltage withstand capability suitable for high-voltage applications and has been experimentally verified to conduct a 10-kA pulse current. Key performance tests demonstrate that the stack stray inductance is only 280 nH, representing a 49% reduction compared to a conventional stack composed of nine packaged RSD chips.","PeriodicalId":450,"journal":{"name":"IEEE Transactions on Plasma Science","volume":"54 4","pages":"1382-1389"},"PeriodicalIF":1.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147685309","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":"Transactions on Plasma Science","authors":"","doi":"10.1109/TPS.2026.3679157","DOIUrl":"https://doi.org/10.1109/TPS.2026.3679157","url":null,"abstract":"","PeriodicalId":450,"journal":{"name":"IEEE Transactions on Plasma Science","volume":"54 4","pages":"C2-C2"},"PeriodicalIF":1.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11482055","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147685368","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}
Yiliang Lv;Zhiwei Kang;Ning Wang;Wenbo Yang;Liang Li;Aoming Ge
{"title":"Reverse Voltage Analysis of the Precharge Capacitor in the Direct Trigger Circuit for RSD","authors":"Yiliang Lv;Zhiwei Kang;Ning Wang;Wenbo Yang;Liang Li;Aoming Ge","doi":"10.1109/TPS.2026.3662434","DOIUrl":"https://doi.org/10.1109/TPS.2026.3662434","url":null,"abstract":"Reversely switched dynistor (RSD) is a specialized semiconductor switch with significant potential in pulsed power applications, with the maximum switching current rise rate exceeding tens of kA/<inline-formula> <tex-math>$mu $ </tex-math></inline-formula>s and the maximum forward current reaching hundreds of kA. The RSD is triggered by a reverse precharge current, with the direct trigger circuit being the most commonly used trigger circuit. When the main capacitor discharges, the precharge circuit shunts a small portion of the RSD main current. As a result, the peak reverse voltage appears across the precharge capacitor. When the current shunted by the precharge circuit is high, the peak reverse voltage of the precharge capacitor can significantly exceed its charging voltage. This study analyzes the reverse voltage characteristics of the precharge capacitor in an RSD direct trigger circuit. The results indicate that the reverse voltage of the precharge capacitor is influenced by the voltage of the main capacitor. In experiments, when the voltage of the main capacitor is 1700 V and the voltage of the precharge capacitor is 300 V, the peak reverse voltage reaches 589 V, which is <inline-formula> <tex-math>$1.96times $ </tex-math></inline-formula> the charging voltage of the precharge capacitor. Furthermore, when the half-cycle time of the precharge current approaches the magnetic switch blocking time, the peak reverse voltage of the precharge capacitor decreases. Experimentally, by aligning the half-cycle time of the precharge current closer to the magnetic switch blocking time, the peak reverse voltage is reduced by up to 21.9%.","PeriodicalId":450,"journal":{"name":"IEEE Transactions on Plasma Science","volume":"54 4","pages":"1404-1410"},"PeriodicalIF":1.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147685318","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":"Investigation of Effective Electrode Configuration From Composite Materials Using Pulsed Discharge for Metal Removal","authors":"Takuto Doi;Shota Oishi;Takashi Sakugawa;Kaisei Nishimura;Shinichiro Shobako;Shin'ichi Shimasaki;Tomohiko Yamashita","doi":"10.1109/TPS.2025.3620423","DOIUrl":"https://doi.org/10.1109/TPS.2025.3620423","url":null,"abstract":"Pulsed power technology has been studied for e-waste recycling. Applying pulsed discharge can separate composite materials into plastics and metals. This study separates metal and plastic components in indium tin oxide (ITO)-coated polyethylene terephthalate (PET) film. We investigated an effective electrode configuration for metal removal from composite materials using pulsed discharge. We used two distinct electrode configurations: rod-to-rod electrodes and plate-to-plate electrodes. A series of single-pulse discharges were applied at various electrode distances. As a result, the flat plate electrodes demonstrated superior metal removal, achieving an area 3.6 times larger than the rod electrodes at a 20-mm electrode gap. Analysis of the current density and comparison to the target condition revealed that the current density greatly affected the metal removal area. Maximizing the removal area during the recycling process by pulsed power is possible with a suitable electrode configuration.","PeriodicalId":450,"journal":{"name":"IEEE Transactions on Plasma Science","volume":"54 4","pages":"1882-1888"},"PeriodicalIF":1.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147685334","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":"Electromagnetic Analysis of an Axial Flux Air-Core Compulsator Excited by Permanent Magnets","authors":"Claudia Simonelli;Nicolò Gori;Giovanni Landi;Rocco Rizzo;Luca Sani;Syed Arslan Bukhari;Hao Chen","doi":"10.1109/TPS.2025.3637529","DOIUrl":"https://doi.org/10.1109/TPS.2025.3637529","url":null,"abstract":"In this contribution, the performance of an axial flux air-core pulsed alternator is investigated in both uncompensated and compensated topologies. The numerical analysis of the device is carried out using a research numerical code based on an integral formulation able to consider all the principal electromechanical quantities and phenomena. As is known, integral formulations, which require the discretization of the active regions only, show very good performance in the analysis of devices with moving conductors because of the absence of sliding meshes. The considered device is an axial flux four-phase, eight-pole air-core compulsator excited by permanent magnets (PMs). The compensation is obtained with continuous aluminum shields attached to the rotors and facing the armature windings. The compensated and uncompensated devices are analyzed at two rotational speeds, obtaining the current in the load and in the compulsator’s phase windings. Moreover, the mechanical torque needed to maintain a constant rotational speed is reported in the shielded and unshielded configurations. The analysis highlighted that the presence of the shield results in an increase in the load current and torque for both the rotational speeds analyzed.","PeriodicalId":450,"journal":{"name":"IEEE Transactions on Plasma Science","volume":"54 4","pages":"1923-1929"},"PeriodicalIF":1.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11289847","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147685305","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":"Special Issue on the 40th PSSI National Symposium on Plasma Science and Technology (PLASMA 2025)","authors":"","doi":"10.1109/TPS.2026.3679845","DOIUrl":"https://doi.org/10.1109/TPS.2026.3679845","url":null,"abstract":"","PeriodicalId":450,"journal":{"name":"IEEE Transactions on Plasma Science","volume":"54 4","pages":"1422-1422"},"PeriodicalIF":1.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11482039","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147685354","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}