A sub-luminal Alcubierre warp bubble can focus or reflect space debris, and a hand-tuned 'deflector shield' modification of the metric is claimed to keep incident particles below 2% of light speed.
Detailed study of null and timelike geodesics in the alcubierre warp spacetime.General Relativity and Gravitation, 44(2):509–533, 2012
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Exploring Particle Geodesics in a Warp Drive Spacetime
A sub-luminal Alcubierre warp bubble can focus or reflect space debris, and a hand-tuned 'deflector shield' modification of the metric is claimed to keep incident particles below 2% of light speed.