Journal of electric propulsion最新文献_第2页

Spatial structures of different particles in helicon plasma 螺旋子等离子体中不同粒子的空间结构

Journal of electric propulsion Pub Date : 2024-04-16 DOI: 10.1007/s44205-024-00068-z

Zun Zhang, Jikun Zhang, Yuzhe Sun

引用次数: 0

Predicting the antenna properties of helicon plasma thrusters using machine learning techniques 利用机器学习技术预测螺旋桨等离子推进器的天线特性

Journal of electric propulsion Pub Date : 2024-03-05 DOI: 10.1007/s44205-023-00063-w

Oscar Malm, N. Souhair, Alessandro Rossi, Mirko Magarotto, F. Ponti

引用次数: 0

Particle-in-Cell simulation of radio-frequency ion thruster RIT-1.0 射频离子推进器 RIT-1.0 的舱内粒子模拟

Journal of electric propulsion Pub Date : 2024-02-22 DOI: 10.1007/s44205-024-00067-0

Ninad Joshi, Christian Heiliger

引用次数: 0

Implementation of direct battery driven discharge in triggerless operation of vacuum arc thrusters 在真空电弧推进器的无触发操作中实现直接电池驱动放电

Journal of electric propulsion Pub Date : 2024-01-15 DOI: 10.1007/s44205-023-00065-8

James Saletes, Kash Saddul, Alexander Wittig, Minkwan Kim

引用次数: 0

3D micro printed capillary electrospray thruster with a fully modular integrated extraction electrode 带有完全模块化集成萃取电极的 3D 微打印毛细管电喷雾推进器

Journal of electric propulsion Pub Date : 2024-01-12 DOI: 10.1007/s44205-023-00066-7

Fynn L. Kunze, Torsten Henning, Peter J. Klar

引用次数: 0

Concerning the ignition of a C12A7 electride plasma-based cathode 关于点燃 C12A7 电化物等离子阴极的问题

Journal of electric propulsion Pub Date : 2024-01-05 DOI: 10.1007/s44205-023-00064-9

C. Drobny, Martin Tajmar

引用次数: 0

Design and testing of a Mini-RF plasma thruster with permanent magnets 设计和测试带永磁体的微型射频等离子推进器

Journal of electric propulsion Pub Date : 2024-01-02 DOI: 10.1007/s44205-023-00062-x

Yuzhe Sun, Jikun Zhang, Zun Zhang

引用次数: 0

Current pathways model for hall thruster plumes in ground-based vacuum test facilities: measurements and observations. 地面真空试验设施中霍尔推力器羽流的电流路径模型：测量和观察。

Journal of electric propulsion Pub Date : 2024-01-01 Epub Date: 2024-12-30 DOI: 10.1007/s44205-024-00097-8

David R Jovel, Janice D Cabrera, Mitchell L R Walker

{"title":"Current pathways model for hall thruster plumes in ground-based vacuum test facilities: measurements and observations.","authors":"David R Jovel, Janice D Cabrera, Mitchell L R Walker","doi":"10.1007/s44205-024-00097-8","DOIUrl":"https://doi.org/10.1007/s44205-024-00097-8","url":null,"abstract":"A previous companion paper introduced a current pathways model that represents the electrical coupling between the Hall effect thruster (HET) and the ground-based vacuum test facility operational environment. In this work, we operated a 7-kW class HET at 4.5 kW, 15 A and 6 kW, 20 A on krypton to quantify aspects of the current pathways model to characterize the role metal vacuum chambers play in the thruster's discharge circuit as a function of discharge current. During HET operation, far-field ion and electron saturation currents at 47 near-facility wall locations were measured using an array of 5.08 cm diameter, stainless-steel planar electrodes. In addition, the plasma properties at three distinct locations within the facility, 25 cm from the facility wall, were obtained using Langmuir probes. Experimental results show that thruster beam ions do not readily neutralize with cathode electrons and instead neutralize with the free electrons provided by the metallic chamber wall. In addition, significant charge-exchange (CEX) ion current was measured in the background plasma environment and constituted about 23% of the total ion current measured by the planar electrode array. Thus, the metallic vacuum chamber surfaces facilitate charge neutralization for both ion populations. Additionally, the plasma environment near the facility walls was characterized to be non-uniform with an estimated plasma sheath capacitance ranging between 0.45 µF and 1.79 µF. Further analysis shows that the plasma sheath at the facility wall behaves like a parallel RC circuit, potentially concealing the thruster's AC characteristics. Inherent plasma oscillations give rise to inductive effects with inductances that varied between 76.5 nH and 101.4 nH. Hence, the dynamic characteristics of the HET's discharge are influenced by the capacitive and inductive effects introduced by the vacuum test facility operational environment.","PeriodicalId":73724,"journal":{"name":"Journal of electric propulsion","volume":"3 1","pages":"35"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11685261/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142916628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hall effect thruster impedance characterization in ground-based vacuum test facilities. 地面真空试验装置中的霍尔效应推力器阻抗特性。

Journal of electric propulsion Pub Date : 2024-01-01 Epub Date: 2024-12-02 DOI: 10.1007/s44205-024-00088-9

David R Jovel, Janice D Cabrera, Mitchell L R Walker

{"title":"Hall effect thruster impedance characterization in ground-based vacuum test facilities.","authors":"David R Jovel, Janice D Cabrera, Mitchell L R Walker","doi":"10.1007/s44205-024-00088-9","DOIUrl":"10.1007/s44205-024-00088-9","url":null,"abstract":"Hall effect thrusters (HETs) are typically regarded as DC electric propulsion devices as they are operated with isolated DC power supplies. However, it is well known that the HET's discharge current possesses oscillations of varying magnitudes and frequencies and is thus a function of time with AC characteristics. The observed oscillations are caused by plasma processes associated with ion, electron, and neutral particle dynamics that occur inside the HET's discharge channel and in the plume as the HET electrically interacts with its local operating environment. The extent to which plasma oscillations impact HET discharge dynamics is difficult to quantify due to the complexity of analyzing AC signals, given that the HET is a nonlinear, time-variant electrical load. In this work, we overcome the challenge of nonlinearity and time-variance of HETs by conducting a small-signal impedance analysis to characterize the effective resistance and reactance of the HET discharge with a novel and versatile impedance measurement diagnostic. The impedance magnitude and phase of a 7-kW class HET were measured from 100 Hz to 300 kHz with an excitation signal of ± 2 V pk for two discharge operating conditions on krypton: 4.5 kW, 15 A and 6 kW, 20 A. The results were used to quantify resistive, capacitive, and inducive characteristics present within the HET discharge signature. For the 4.5 kW, 15 A thruster operating condition, the breathing mode capacitance was estimated to be 12.6 µF with an inductance of 15.3 µH. Furthermore, the impedance characteristics of the breathing mode are within ± 2.4 kHz of the power spectral density plots independently generated by time-resolved oscilloscope traces indicating good agreement in the frequency domain. Thus, the impedance measurement tool is a new diagnostic for characterizing the impedance and associated AC characteristics of HETs.","PeriodicalId":73724,"journal":{"name":"Journal of electric propulsion","volume":"3 1","pages":"31"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11611958/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142782021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization of a C12A7 electride plasma-based cathode using different keeper orifice sizes 使用不同保持器孔径的 C12A7 电解等离子阴极的特性分析

Journal of electric propulsion Pub Date : 2023-12-01 DOI: 10.1007/s44205-023-00061-y

C. Drobny, Martin Tajmar

引用次数: 0