IEEE Transactions on Plasma Science最新文献_第6页

Spectral Properties and High Brilliance Features of Two-Frequency Step Tapered Asymmetric Undulator Radiation 双频阶梯锥形非对称Undulator辐射的光谱特性和高亮度特征

IF 1.3 4区物理与天体物理

IEEE Transactions on Plasma Science Pub Date : 2024-09-12 DOI: 10.1109/TPS.2024.3452930

G. Mishra;Rohit Kamle

引用次数: 0

Effect of Cathode Coil on the Commissioning of 42-GHz Gyrotron for ECRH System in SST-1 and Aditya-U 阴极线圈对用于 SST-1 和 Aditya-U ECRH 系统的 42-GHz 陀螺仪调试的影响

IF 1.5 4区物理与天体物理

IEEE Transactions on Plasma Science Pub Date : 2024-09-10 DOI: 10.1109/tps.2024.3423345

Braj Kishore Shukla, Jatin Patel, Harshida Patel, K. G. Parmar, Hardik Mistry, Dharmesh Purohit, Paresh Patel, Artyom Kuzmin, Andrey Mazunin, Elena Soluyanova, Evgeny Tai

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Calculation of Armature Melting Wear Rate Based on Contact Surface Heat Distribution 根据接触面热量分布计算电枢熔化磨损率

IF 1.3 4区物理与天体物理

IEEE Transactions on Plasma Science Pub Date : 2024-09-10 DOI: 10.1109/TPS.2024.3406713

Anxin Guo;Xiangyu Du;Xuezhi Wang;Shaowei Liu

{"title":"Calculation of Armature Melting Wear Rate Based on Contact Surface Heat Distribution","authors":"Anxin Guo;Xiangyu Du;Xuezhi Wang;Shaowei Liu","doi":"10.1109/TPS.2024.3406713","DOIUrl":"10.1109/TPS.2024.3406713","url":null,"abstract":"Wear between the armature and the rail directly affects the state of armature–rail contact, which in turn affects the service life and launching efficiency of the electromagnetic rail launcher. In order to investigate the armature melting wear law during the launching process, a heat distribution model on the contact surface of the armature–rail is proposed, and a transient calculation model of armature wear is derived; to solve the model, the excitation current, inductance gradient, and contact resistance of the launcher were calculated and further analyzed with respect to the kinematic characteristics of the armature chamber. On this basis, the change rule of armature melting wear rate and the influencing factors are studied, and the derived calculation model is verified by using the experimental method. The results of this study show that the trend of armature wear rate can be broadly classified into a rapidly increasing phase, a sharply decreasing phase, and a smooth phase, with the maximum wear rate reaching about 0.008; the coefficient of friction, rail material, and rail structure all have an effect on the magnitude of the armature wear rate, but do not affect the trend of the armature wear rate; the experimentally verified armature wear volume differs from the theoretically calculated wear volume by only 3.65%. The model and analysis results established in this article are of great significance for optimizing the armature structure, improving the armature–rail contact performance, and ensuring the launching safety.","PeriodicalId":450,"journal":{"name":"IEEE Transactions on Plasma Science","volume":"52 7","pages":"2981-2990"},"PeriodicalIF":1.3,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175247","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

Experimental Assessment of Low-Pressure Plasma Interference-Switch Performance in MW-Class Microwave Pulse Compressor MW 级微波脉冲压缩器中低压等离子体干扰开关性能的实验评估

IF 1.3 4区物理与天体物理

IEEE Transactions on Plasma Science Pub Date : 2024-09-10 DOI: 10.1109/TPS.2024.3445718

Vasilios A. Tantanis;Stylianos P. Savaidis;Zisis C. Ioannidis;Dimitra I. Kaklamani;Nikolaos K. Uzunoglu

引用次数: 0

Analysis on the Propagation Characteristics of Terahertz Signals in Blunt-Coned and Sharp-Coned Vehicle in Different Sizes 太赫兹信号在不同尺寸的钝锥形和锐锥形车辆中的传播特性分析

IF 1.3 4区物理与天体物理

IEEE Transactions on Plasma Science Pub Date : 2024-09-10 DOI: 10.1109/TPS.2024.3451064

Pingsheng Liu;Ziyang Zhao;Kai Yuan;Zhikang Chu;Rongxin Tang

{"title":"Analysis on the Propagation Characteristics of Terahertz Signals in Blunt-Coned and Sharp-Coned Vehicle in Different Sizes","authors":"Pingsheng Liu;Ziyang Zhao;Kai Yuan;Zhikang Chu;Rongxin Tang","doi":"10.1109/TPS.2024.3451064","DOIUrl":"10.1109/TPS.2024.3451064","url":null,"abstract":"In the recent decade, Terahertz (THz) communication has been recognized as one of the possible paths to solve the communication blackout for reentry vehicles. Previous studies have mainly focused on the plasma structure and Terahertz signal propagation mechanisms of vehicle of the same model. However, actual vehicle comes in various sizes, necessitating further research into the relationship between different-sized vehicle and Terahertz signal transmission characteristics. This study takes typical RAM-C blunt-coned and pointed-coned vehicles as objects to analyze the impact of vehicle size changes on plasma sheath parameters. The propagation characteristics of Terahertz signals in plasma sheaths of different sizes were studied using the scattering matrix method (SMM) method. The analysis conclusion indicates that as the size of blunt-coned and sharp-coned vehicles increases, the thickness of the plasma sheath layer also increases, resulting in more severe attenuation of Terahertz signals. Increasing the size of the vehicle enhances electron collision frequency, while the fluctuation in maximum electron density increases with the size of blunt-coned vehicle and decreases with the size of sharp-coned vehicle. In the Terahertz signal transmission characteristics, blunt-coned vehicles are mainly affected by signal absorption, while sharp-coned cone vehicles are affected by both reflection and absorption. Reducing the size of the vehicle and the thickness of the plasma sheath layer can mitigate Terahertz signal attenuation.","PeriodicalId":450,"journal":{"name":"IEEE Transactions on Plasma Science","volume":"52 7","pages":"3061-3071"},"PeriodicalIF":1.3,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175250","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

A Comparative Study of In- and Post-Plasma Catalysis Configurations for Ammonia Synthesis: Effect of Temperature 氨合成中等离子体内和后等离子体催化配置的比较研究：温度的影响

IF 1.3 4区物理与天体物理

IEEE Transactions on Plasma Science Pub Date : 2024-09-09 DOI: 10.1109/TPS.2024.3450849

Kelin Li;She Chen;Hang Guo;Mengbo Li;Lipeng Zhong;Qiuqin Sun;Feng Wang

{"title":"A Comparative Study of In- and Post-Plasma Catalysis Configurations for Ammonia Synthesis: Effect of Temperature","authors":"Kelin Li;She Chen;Hang Guo;Mengbo Li;Lipeng Zhong;Qiuqin Sun;Feng Wang","doi":"10.1109/TPS.2024.3450849","DOIUrl":"10.1109/TPS.2024.3450849","url":null,"abstract":"As an important chemical, ammonia plays an important role in human life and society. Nevertheless, there is a substantial release of CO2 for the traditional industrial ammonia synthesis process. Plasma catalysis can activate gas molecules and lower activation energy, making it a promising avenue for this reaction. The current study reveals that ammonia decomposition within the plasma discharge region significantly limits ammonia production for in-plasma catalysis (IPC) configuration. On the other hand, for post-plasma catalysis (PPC) configuration, the densities of reactive species will decrease when migrating to the downstream catalyst region, which is unfavorable for plasma catalytic ammonia synthesis. Therefore, the performances of ammonia synthesis under different plasma catalytic configurations have been investigated with the catalyst of Ni/Al2O3. In experiments with a N2:H2 flow rate ratio of 3:1, the ammonia concentration under PPC configuration was \u0000<inline-formula> <tex-math>$224.53~mu $ </tex-math></inline-formula>\u0000mol/h, while the synthesis rate under IPC configuration reached \u0000<inline-formula> <tex-math>$592.30~mu $ </tex-math></inline-formula>\u0000mol/h. This indicates that the catalyst located in the discharge zone accelerates ammonia synthesis under ambient temperature. Furthermore, ammonia synthesis experiments were conducted under IPC and PPC configurations at different temperatures. Experimental results show higher ammonia concentrations with IPC configuration at temperatures below 200 °C. Beyond 200 °C, the ammonia concentrations between the two configurations become closer. Finally, the ammonia synthesis reaction mechanisms under IPC and PPC configurations are analyzed, which help to clarify the difference in ammonia synthesis performance under IPC and PPC configurations.","PeriodicalId":450,"journal":{"name":"IEEE Transactions on Plasma Science","volume":"52 6","pages":"2180-2186"},"PeriodicalIF":1.3,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175251","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

Cost-Effective Microwave Assisted ECR Heating Using Combination of Quasi-Locked Low-Power Magnetrons on GLAST-III 在 GLAST-III 上使用准锁定低功率磁控管组合进行经济高效的微波辅助 ECR 加热

IF 1.3 4区物理与天体物理

IEEE Transactions on Plasma Science Pub Date : 2024-09-09 DOI: 10.1109/TPS.2024.3443132

Shahab Ud-Din Khan;Muhammad Faizan Tahir;Zia Ur Rehman;Riaz Khan;Ahmad Ali;Muhammad Abdullah;Sehrish Shakir;Ayesha Alam;Shahzaib Zahid

{"title":"Cost-Effective Microwave Assisted ECR Heating Using Combination of Quasi-Locked Low-Power Magnetrons on GLAST-III","authors":"Shahab Ud-Din Khan;Muhammad Faizan Tahir;Zia Ur Rehman;Riaz Khan;Ahmad Ali;Muhammad Abdullah;Sehrish Shakir;Ayesha Alam;Shahzaib Zahid","doi":"10.1109/TPS.2024.3443132","DOIUrl":"10.1109/TPS.2024.3443132","url":null,"abstract":"Glass spherical tokamak-III (GLAST-III) is a small spherical tokamak (\u0000<inline-formula> <tex-math>$R =20$ </tex-math></inline-formula>\u0000 cm, \u0000<inline-formula> <tex-math>$a =10$ </tex-math></inline-formula>\u0000 cm, and \u0000<inline-formula> <tex-math>$A =2$ </tex-math></inline-formula>\u0000) developed at Pakistan Tokamak Plasma Research Institute (PTPRI). To assist the plasma discharge and generate considerable plasma current in GLAST-III, high-power microwave sources can indeed play an important role in noninductive startups of plasma discharges such as electron cyclotron resonance heating (ECRH). A power-enhanced pulsed microwave source (2.45 GHz and 1.6 kW) has previously been developed and tested at PTPRI. However, higher powers are required to increase the generated charge density for effective pre-ionization. Therefore, a microwave pre-ionization source (up to 20 kW at 2.45 GHz) is installed on GLAST-III to reduce the high-loop voltage requirement during the plasma start-up. ECRH has been effectively utilized for this purpose. In this article, an economical high-power microwave source is fabricated by coupling low-power magnetrons in a waveguide. We employed Walton multiplier circuits for the first time to operate two magnetrons coupled for power addition. The coupling of two magnetrons due to constructive interference is demonstrated successfully during continuous as well as pulsed operation. The scheme can be made more effective in future studies by injection locking of magnetrons. These innovative low-cost schemes can play a pivotal role in carrying out microwave studies on spherical tokamaks such as GLAST-III.","PeriodicalId":450,"journal":{"name":"IEEE Transactions on Plasma Science","volume":"52 6","pages":"2021-2028"},"PeriodicalIF":1.3,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175253","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

Experimental Research on an X-Band Magnetron Fed by Solid and Split Cathodes 固体和分离阴极馈电的 X$ 波段磁控管实验研究

IF 1.3 4区物理与天体物理

IEEE Transactions on Plasma Science Pub Date : 2024-09-06 DOI: 10.1109/TPS.2024.3450928

Oleg Belozerov;Gennadii D. Liziakin;J. G. Leopold;Andrey D. Andreev;Y. Hadas;E. Magid;Edl Schamiloglu;Yakov E. Krasik

引用次数: 0

Study of Shock Formation Parameters With Drive Conditions in Magnetically Accelerated Plasma Flows 磁加速等离子体流中冲击形成参数与驱动条件的研究

IF 1.5 4区物理与天体物理

IEEE Transactions on Plasma Science Pub Date : 2024-09-06 DOI: 10.1109/tps.2024.3442748

Simon C. Bott-Suzuki, Maria Pia Valdivia, Jacob T. Banasek, Samuel W. Cordaro, Ann Truong, Hanyu Hu, Chin-Chou Wu, Noah Dilworth, B. R. Kusse, D. A. Hammer, Eric Sander Lavine, W. M. Potter, J. B. Greenly, Felipe Veloso

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Helical Striations and Magnetic Flux Compression in an Axially Premagnetized Gas-Puff $z$-Pinch Imploding Onto a Dense Central Target 轴向预磁化气泡z$-Pinch内爆到致密中心靶上的螺旋条纹和磁通量压缩

IF 1.5 4区物理与天体物理

IEEE Transactions on Plasma Science Pub Date : 2024-09-06 DOI: 10.1109/tps.2024.3435720

Joe M. Chen, George V. Dowhan, Brendan J. Sporer, David A. Yager-Elorriaga, Nicholas M. Jordan, Ryan D. McBride

引用次数: 0