A. Blednich, D.Kostin, V.Kaljuzhny, M.Lalayan, O.Milovanov, A.Ponomarenko, N.Sobenin, A.Sulimov, D.Trubin, A.Zavadzev (MEPhI, Russia), M.Dohlus (DESY)
Some modifications of a Rectangular WaveGuide HOM couplers for TESLA superstructure have been investigated. These RWG HOM couplers are installed between the cavities of the superstructure and also at the both ends of this one. We investigated a RWG HOM coupler attached to the beam pipe through the slots orientated along beam pipe axis (longitudinal slots), perpendicular to it (azimuthal slots) and at some angle to this axis. For damping dipole modes of both polarizations two RWG in every design were used. This paper present the results of calculations and RF measurements at two copper cavities of superstructure with a scaled -up model at 3 GHz at room temperature. The advantages of HOM coupler with longitudinal slots for damping dipole modes and compact of HOM coupler with slots at some angle to the axis were shown. Arrangement of HOM coupler in cryostat and heating due to HOM and FM losses are presented. Calculations ant design of the feeding RWG coupler for superstructure are presented too.
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