000441178 001__ 441178 000441178 005__ 20211110160705.0 000441178 0247_ $$2INSPIRETeX$$aSchroder:2020ekn 000441178 0247_ $$2inspire$$ainspire:1797720 000441178 0247_ $$2arXiv$$aarXiv:2005.12071 000441178 0247_ $$2datacite_doi$$a10.3204/PUBDB-2020-02356 000441178 037__ $$aPUBDB-2020-02356 000441178 041__ $$aEnglish 000441178 088__ $$2arXiv$$aarXiv:2005.12071 000441178 088__ $$2DESY$$aDESY-20-039 000441178 1001_ $$0P:(DE-H253)PIP1023434$$aSchröder, Sarah$$b0$$eCorresponding author 000441178 245__ $$aTunable and precise two-bunch generation at FLASHForward 000441178 260__ $$c2020 000441178 3367_ $$0PUB:(DE-HGF)25$$2PUB:(DE-HGF)$$aPreprint$$bpreprint$$mpreprint$$s1594107119_32429 000441178 3367_ $$2ORCID$$aWORKING_PAPER 000441178 3367_ $$028$$2EndNote$$aElectronic Article 000441178 3367_ $$2DRIVER$$apreprint 000441178 3367_ $$2BibTeX$$aARTICLE 000441178 3367_ $$2DataCite$$aOutput Types/Working Paper 000441178 500__ $$a7 pages, 5 figures, to be published in the proceedings of the 4th European Advanced Accelerator Concepts Workshop, 15-21 September 2019, La Biodola Bay, Isola d'Elba, Italy 000441178 520__ $$aBeam-driven plasma-wakefield acceleration based on external injection has the potential to significantly reduce the size of future accelerators. Stability and quality of the acceleration process substantially depends on the incoming bunch parameters. Precise control of the current profile is essential for optimising energy-transfer efficiency and preserving energy spread. At the FLASHForward facility, driver--witness bunch pairs of adjustable bunch length and separation are generated by a set of collimators in a dispersive section, which enables fs-level control of the longitudinal bunch profile. The design of the collimator apparatus and its commissioning is presented. 000441178 536__ $$0G:(DE-HGF)POF3-631$$a631 - Accelerator R & D (POF3-631)$$cPOF3-631$$fPOF III$$x0 000441178 536__ $$0G:(DE-H253)PWA-20150304$$aPWA - Research group for plasma-based accelerators (PWA-20150304)$$cPWA-20150304$$x1 000441178 536__ $$0G:(DE-HGF)2018_ZT-0009$$aZT-0009 - Plasma Accelerators (2018_ZT-0009)$$c2018_ZT-0009$$x2 000441178 588__ $$aDataset connected to INSPIRE 000441178 693__ $$0EXP:(DE-H253)FLASHForward-20150101$$1EXP:(DE-H253)FLASH-20150101$$5EXP:(DE-H253)FLASHForward-20150101$$aFLASH$$eFLASHForward$$x0 000441178 7001_ $$0P:(DE-H253)PIP1000204$$aLudwig, Kai$$b1 000441178 7001_ $$0P:(DE-H253)PIP1019742$$aAschikhin, A.$$b2 000441178 7001_ $$0P:(DE-H253)PIP1027904$$aD'Arcy, R.$$b3 000441178 7001_ $$0P:(DE-H253)PIP1030726$$aDinter, M.$$b4 000441178 7001_ $$0P:(DE-H253)PIP1022006$$aGonzalez Caminal, Pau$$b5 000441178 7001_ $$0P:(DE-H253)PIP1002264$$aKarstensen, S.$$b6 000441178 7001_ 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