Title:
方向付けされた熱分解グラファイトから作られているグリッドを有するイオンスラスタ
Document Type and Number:
Japanese Patent JP3576979
Kind Code:
B2
Abstract:
An ion thruster (20) includes a source (24) of a plasma of ions and electrons, and an ion-optics system (34) located in sufficient proximity to the source (24) of the plasma to extract ions therefrom. The ion-optics system (34) has at least two domed grids (42, 44, 46) arranged in a facing-but-spaced-apart relationship to each other. Each grid (42, 44, 46) has a local reference vector (58) that is perpendicular to the surface of the grid (42, 44, 46) and a reference plane (60) perpendicular to the reference vector (58). Each of the grids (42, 44, 46) is formed of anisotropic pyrolytic graphite having an "ab" crystallographic plane (64) that lies substantially in the reference plane (60). In one form, the "ab" crystallographic plane (64) lies coplanar with the reference plane (60) at all locations on each domed grid (42, 44, 46) made of pyrolytic graphite. In another form, the "ab" crystallographic plane (64) has a constant orientation at all locations on the domed grid (42, 44, 46). In yet another form, wherein the ion optics system (34) has an axis of thrust (38), the "ab" crystallographic plane (64) of the pyrolytic graphite lies substantially perpendicular to the axis of thrust (38) (Fig. 3A).
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Inventors:
Louis Raymond Fars
John Earl Beatty
John Earl Beatty
Application Number:
JP2001015728A
Publication Date:
October 13, 2004
Filing Date:
January 24, 2001
Export Citation:
Assignee:
The Boeing Company
International Classes:
B64G1/40; F03G7/00; F03H1/00; (IPC1-7): F03H1/00; F03G7/00
Domestic Patent References:
| JP10259782A | ||||
| JP5041168A | ||||
| JP61176029A | ||||
| JP8284804A | ||||
| JP9236076A |
Foreign References:
| US5548953 |
Attorney, Agent or Firm:
Takehiko Suzue
Sadao Muramatsu
Atsushi Tsuboi
Ryo Hashimoto
Toshio Shirane
Sadao Muramatsu
Atsushi Tsuboi
Ryo Hashimoto
Toshio Shirane