2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/85287Ground motion at the Future JLC detector may affect beam alignment and cause huge luminosity loss. The FEATHER (FEedback AT High Energy Requirements) project addresses this problem by designing a fast intra-pulse feedback system that will correct the observed beam offset.To appear in the Proceedings of the 8th Accelerator and Particle Physics Institute (APPI 2003), Iwate, Japan. FEATHER homepage: http://acfahep.kek.jp/subg/ir/feather/Instrumentation and DetectorsAccelerator Physicstext