著者

Kazuma Emoto Yoshinori Takao Hitoshi Kuninaka

出版者

Japanese Society for Biological Sciences in Space

雑誌

Biological Sciences in Space (ISSN:09149201)

巻号頁・発行日

vol.32, pp.1-5, 2018 (Released:2018-04-28)

参考文献数

13

被引用文献数

4

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We propose radiation shielding using Martian magnetic anomalies to protect human crews on the Martian surface. We have simulated the trajectories of energetic protons using the Buneman-Boris method to measure how magnetic anomalies affect the impact rate on the Martian surface. Protons from the west can be completely eliminated, while those from the east are concentrated on the area between the magnetic poles. This would mean crews would need to concern themselves about radiation from the vertex and east only. A Martian magnetic anomaly can therefore be used to realize continuous and efficient radiation shielding.

著者

Akane NISHIMURA Hirohide KATSUTA Yoshinori TAKAO Toshiyuki TSUCHIYA

出版者

International Symposium on Space Technology and Science

雑誌

Journal of Evolving Space Activities (ISSN:27581802)

巻号頁・発行日

vol.1, pp.7, 2023 (Released:2023-03-23)

参考文献数

13

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An ionic liquid electrospray thruster (ILEST) is expected as a propulsion system to control nano-spacecraft attitude and orbit in space. To produce high thrust, we propose a two-stage electrodes thruster which has an accelerator in addition to an extractor. We fabricated emitters on a silicon wafer and the two-stage electrodes on a glass substrate with through holes using microfabrication technologies. We confirmed that the fabricated ILEST emitted ions or droplets from the silicon emitters at near 2.0 kV. The maximum current in single-stage operation was -570 µA at 3.0 kV. With two-stage operation using the accelerator, ion emission happens at high voltage without conduction between the extractor and the accelerator. The results show the advantage of the fabricated two-stage electrodes. Currently, extracted ions were captured mostly at the extractor because of the poor alignment of the emitter silicon chip to the jig.