000642928 001__ 642928 000642928 005__ 20260218131037.0 000642928 037__ $$aPUBDB-2025-05724 000642928 041__ $$aEnglish 000642928 1001_ $$0P:(DE-H253)PIP1089935$$aWood, Jonathan Christopher$$b0$$eCorresponding author$$udesy 000642928 1112_ $$a7th European Advanced Accelerator Conference$$cElba$$d2025-09-21 - 2025-09-27$$gEAAC$$wItaly 000642928 245__ $$aLatest Results from the FLASHForward Experiment 000642928 260__ $$c2025 000642928 3367_ $$033$$2EndNote$$aConference Paper 000642928 3367_ $$2DataCite$$aOther 000642928 3367_ $$2BibTeX$$aINPROCEEDINGS 000642928 3367_ $$2DRIVER$$aconferenceObject 000642928 3367_ $$2ORCID$$aLECTURE_SPEECH 000642928 3367_ $$0PUB:(DE-HGF)6$$2PUB:(DE-HGF)$$aConference Presentation$$bconf$$mconf$$s1770725422_3476910 000642928 502__ $$cDESY 000642928 520__ $$aThe FLASHForward experiment at DESY uses high-quality electron bunches from the FLASH linac to perform fundamental plasma-wakefield-accelerator research. An overview of recent results will be provided in three areas: beam-quality preservation, energy efficient acceleration and repetition-rate limits. By precisely controlling the transverse properties of the witness bunch we demonstrate the preservation of the witness-bunch emittance εn during plasma acceleration for the first time. εn was preserved at 2.8 mm-mrad while maintaining > 20% instantaneous energy-transfer efficiency. To improve the overall energy-transfer efficiency, the acceleration distance must be increased. We will present the design and development of a new discharge plasma source which allowed us to accelerate a 1.2 GeV witness bunch by more than 0.5 GeV with per-cent-level energy spread. To further improve bunch quality, we have incorporated Bayesian optimisation techniques into our workflow and have demonstrated 0.25 GeV energy gain with < 0.2% energy spread. 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