TY - RPRT AU - Piot, Philippe AU - , L. Carr. AU - Graves, William AU - Loose, Hannes TI - A Design of a 3rd Harmonic Cavityfor the TTF 2 Photoinjector IS - TESLA FEL 2002-07 M1 - PUBDB-2018-03313 M1 - TESLA FEL 2002-07 SP - 26 PY - 2002 AB - A design of a superconducting 3.9 GHz cavity for the in-jector of the TTF FEL-User Facility is presented. The cav-ity will be located after the first TESLA module with eight1.3 GHz cavities and before the first bunch compressor. Thepurpose of the cavity is to cancel nonlinear distortions in thelongitudinal phase space due to the cosine-like curvature ofthe 1.3 GHz accelerating cavity voltage. The basic cavityrf parameters and the properties of the higher order modescalculated with several computer codes are shown. LB - PUB:(DE-HGF)29 UR - https://bib-pubdb1.desy.de/record/409203 ER -