국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Extensible Thruster Stand to Improve Vacuum Environment for Ion Thruster Operation
저자	Katsuhiro MIYAZAKI, Yukio HAYAKAWA, Shoji KITAMURA
Keyword
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr01198.pdf?id=NALTR0001198
보고서번호	NAL TR-1198
발행년도	1993.4
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	ter in a vacuum.To achieve this,the vacuum facility was furnished with a thruster lock chamber,and a gate valve between the vacuum chamber and the lock chamber.After opening the gate valve,the thruster stand moves the thruster from the lock chamber into the vacuum chamber,where the vacuum is higher than in the lock chamber,and tests can then be conducted on the thruster.Using conventional methods,if the thruster is placed directly in a vacuum chamber,the chamber must be opened to the air and then evacuated again each time it is opened for the thruster access.This can be very time-consuming,particularly in a large vacuum chamber.Although installing the thruster lock chamber and the gate valve can provide easy thruster access,the problem of small gas flow conductance due to their small inner diameters makes it difficult to attain a high vacuum around the thruster.The extensible thruster stand,together with the lock chamber and the gata valve,can provide both easy thruster access and a high vacuum around the thruster.To demonstrate the advantages of this improved method,we measured the pressures in the main chamber and in the thruster lock chamber as the thruster position was changed.Also,we measured the thruster performance as the chamber pressure was changed by feeding extra xenon.Results of these tests revealed that the pressure around the thruster was lowered to 1/2～1/3 by using this thruster stand and that evaluation accuracy was improved during thruster endurance tests.We further found that this vacuum facility is capable of operating two 25 mN thrusters simultaneously or of operating a larger thruster of 150 mN class.