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Paper Abstract and Keywords
Presentation 2025-12-12 10:50
Fabrication and Evaluation of High-Density Electrospray Thrusters for Improvement of Operating Voltage Range
Shotaro Shimizu (YNU), Masayoshi Nagao, Katsuhisa Murakami, Hiromasa Murata (AIST), Yoshinori Takao (YNU) ED2025-50
Abstract (in Japanese) (See Japanese page) 
(in English) We have applied the field emitter array fabrication method to the fabrication of electrospray thrusters in order to increase the thrust density. Electrospray thrusters are mainly composed of emitter and extractor electrodes, using ionic liquid as a propellant. The emitter shape of the emitter arrays fabricated in the previous study varied due to the characteristics of the lithography tool used, and some emitters had large aperture diameters. This resulted in leakage of the ionic liquid propellant, and
ion emission was observed only within a narrow voltage range. In this study, we aimed to suppress the leakage of the ionic liquid propellant and improve the current and operating voltage range by enhancing the uniformity of the emitter array. As a result, the operating voltage range was successfully increased by 4.4 times compared to that of the previous design. In addition, an increase in the negative current and a reduction in the beam interception rate were confirmed.
Keyword (in Japanese) (See Japanese page) 
(in English) Electric Propulsion / Electrospray Thruster / Ionic Liquid / Field Emitter Array / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 287, ED2025-50, pp. 29-32, Dec. 2025.
Paper # ED2025-50 
Date of Issue 2025-12-04 (ED) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF ED2025-50

Conference Information
Committee ED  
Conference Date 2025-12-11 - 2025-12-12 
Place (in Japanese) (See Japanese page) 
Place (in English) WINC AICHI 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Applications of electron and ion beam 
Paper Information
Registration To ED 
Conference Code 2025-12-ED 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Fabrication and Evaluation of High-Density Electrospray Thrusters for Improvement of Operating Voltage Range 
Sub Title (in English) * 
Keyword(1) Electric Propulsion  
Keyword(2) Electrospray Thruster  
Keyword(3) Ionic Liquid  
Keyword(4) Field Emitter Array  
Keyword(5)  
Keyword(6)  
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1st Author's Name Shotaro Shimizu  
1st Author's Affiliation Yokohama National University (YNU)
2nd Author's Name Masayoshi Nagao  
2nd Author's Affiliation National Institute of Advanced Industrial Science and Technology (AIST)
3rd Author's Name Katsuhisa Murakami  
3rd Author's Affiliation National Institute of Advanced Industrial Science and Technology (AIST)
4th Author's Name Hiromasa Murata  
4th Author's Affiliation National Institute of Advanced Industrial Science and Technology (AIST)
5th Author's Name Yoshinori Takao  
5th Author's Affiliation Yokohama National University (YNU)
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Speaker Author-1 
Date Time 2025-12-12 10:50:00 
Presentation Time 25 minutes 
Registration for ED 
Paper # ED2025-50 
Volume (vol) vol.125 
Number (no) no.287 
Page pp.29-32 
#Pages 4 
Date of Issue 2025-12-04 (ED) 

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