Abstract
Rectangular-waveguide devices intended for the withdrawal and absorption of high-order modes (HOMs) from the superstructure of the TESLA linear electron–positron collider are investigated. These devices, known as couplers, are set in between the subcavities of the superstructure and at its ends. The HOM couplers investigated are connected to the drift tubes via slots oriented along the tube axis (longitudinal slots), at right angles to the axis (azimuthal slots), and at an angle to the axis. In order to damp the HOMs of both polarizations, two rectangular waveguides are used for each coupler. The results of calculation and experimental investigation of two copper subcavities of the superstructure, each one consisting of seven cells, are presented. The investigations were conducted at room temperature at a frequency of 3 GHz using models.
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