{"title":"根据环形磁铁位置确定应用场 MPD 推进器的性能和放电特性","authors":"","doi":"10.1016/j.vacuum.2024.113674","DOIUrl":null,"url":null,"abstract":"<div><div>The magnetic field has a significant impact on the performance and discharge characteristics of magnetoplasmadynamic (MPD) thrusters. A low-power MPD thruster with an operating power of 10 kW was developed, and its performance characteristics were examined by altering the applied magnetic field. The thrust increased from 92 mN to 310 mN, and specific impulse from 479 s to 1264 s, respectively, within the input power range of 4–10 kW. Spectral analysis of the plume revealed that the increase in performance was significantly affected by the ion current density rather than by the ion energy. Furthermore, the shape and flux density of the magnetic fields inside the discharge channel were altered by adjusting the position of the permanent magnets from z = 0 to −4 cm at 1 cm intervals relative to the alumina insulator inside the discharge channel. Consequently, the thrust increased by approximately 14–40 % at the specific magnetic field configuration with a ratio of <em>B</em><sub><em>r</em></sub>/<em>B</em><sub><em>z</em></sub> = 0.3, despite not being at the maximum magnetic field strength. The ratio of the radial to axial magnetic fields is strongly correlated with thruster performance and should be considered in optimizing design.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":null,"pages":null},"PeriodicalIF":3.8000,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Performance and discharge characteristics of Applied–Field MPD thruster in accordance with ring magnet position\",\"authors\":\"\",\"doi\":\"10.1016/j.vacuum.2024.113674\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The magnetic field has a significant impact on the performance and discharge characteristics of magnetoplasmadynamic (MPD) thrusters. A low-power MPD thruster with an operating power of 10 kW was developed, and its performance characteristics were examined by altering the applied magnetic field. The thrust increased from 92 mN to 310 mN, and specific impulse from 479 s to 1264 s, respectively, within the input power range of 4–10 kW. Spectral analysis of the plume revealed that the increase in performance was significantly affected by the ion current density rather than by the ion energy. Furthermore, the shape and flux density of the magnetic fields inside the discharge channel were altered by adjusting the position of the permanent magnets from z = 0 to −4 cm at 1 cm intervals relative to the alumina insulator inside the discharge channel. Consequently, the thrust increased by approximately 14–40 % at the specific magnetic field configuration with a ratio of <em>B</em><sub><em>r</em></sub>/<em>B</em><sub><em>z</em></sub> = 0.3, despite not being at the maximum magnetic field strength. The ratio of the radial to axial magnetic fields is strongly correlated with thruster performance and should be considered in optimizing design.</div></div>\",\"PeriodicalId\":23559,\"journal\":{\"name\":\"Vacuum\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.8000,\"publicationDate\":\"2024-09-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Vacuum\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0042207X24007206\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Vacuum","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0042207X24007206","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Performance and discharge characteristics of Applied–Field MPD thruster in accordance with ring magnet position
The magnetic field has a significant impact on the performance and discharge characteristics of magnetoplasmadynamic (MPD) thrusters. A low-power MPD thruster with an operating power of 10 kW was developed, and its performance characteristics were examined by altering the applied magnetic field. The thrust increased from 92 mN to 310 mN, and specific impulse from 479 s to 1264 s, respectively, within the input power range of 4–10 kW. Spectral analysis of the plume revealed that the increase in performance was significantly affected by the ion current density rather than by the ion energy. Furthermore, the shape and flux density of the magnetic fields inside the discharge channel were altered by adjusting the position of the permanent magnets from z = 0 to −4 cm at 1 cm intervals relative to the alumina insulator inside the discharge channel. Consequently, the thrust increased by approximately 14–40 % at the specific magnetic field configuration with a ratio of Br/Bz = 0.3, despite not being at the maximum magnetic field strength. The ratio of the radial to axial magnetic fields is strongly correlated with thruster performance and should be considered in optimizing design.
期刊介绍:
Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences.
A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below.
The scope of the journal includes:
1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes).
2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis.
3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification.
4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.