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TY - CONF AU - Weih, S. AU - Arnold, M. AU - Bazyl, D.B. AU - De Gersem, H. AU - Enders, J. AU - Müller, W.F.O. AU - Pietralla, N. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Upgrade of the S-DALINAC Injector Capture Section J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - The superconducting injector section of the S-DALINAC (superconducting Darmstadt linear electron accelerator) [1] constists of two cryomodules with three 3-GHz SRF cavities in total. The first cavity of this pre-accelerator is currently a 5-cell structure designed for relativistic particle velocities. Since the gun delivers a 250 keV beam (β=0.74), this cavity is not suited for an efficient capture of the low-energy electron bunches provided by the normal-conducting section of the injector. Beam dynamics simulations and operational experience have shown a large low-energy tail in the phase-space distribution of the bunch downstream of the injector, which arises from the large phase-slippage during the capture in the 5-cell. It is therefore intended to replace the cavity with a beta-adapted 6-cell, re-using most of the cryostat parts. This contribution presents the status of the injector upgrade and the layout and manufacturing status of the new cavity. PB - JACoW Publishing CP - Geneva, Switzerland SP - 227 EP - 229 KW - cavity KW - linac KW - MMI KW - gun KW - target DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-MOP065 UR - http://jacow.org/srf2019/papers/mop065.pdf ER -