Theoretical peak performance and optical constraints for the deflection of an S-type asteroid with a continuous wave laser

详细信息    查看全文

• 作者：Nicolas Thiry ^{nicolas.thiry@strath.ac.uk} ; Massimiliano Vasile ; ^{massimiliano.vasile@strath.ac.uk}
• 关键词：Laser ablation ; Asteroid ; Deflection ; CW laser ; Planetary defense ; Impulse coupling
• 刊名：Advances in Space Research
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：59
• 期：5
• 页码：1353-1367
• 全文大小：2674 K
• 卷排序：59

文摘

This paper presents a theoretical model to evaluate the thrust generated by a continuous wave (CW) laser, operating at moderate intensity (<100 GW/m2), ablating an S-type asteroid made of Forsterite. The key metric to assess the performance of the laser system is the thrust coupling coefficient which is given by the ratio between thrust and associated optical power. Three different models are developed in the paper: a one dimensional steady state model, a full 3D steady state model and a one dimensional model accounting for transient effects resulting from the tumbling motion of the asteroid. The results obtained with these models are used to derive key requirements and constraints on the laser system that allow approaching the ideal performance in a realistic case.