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An electron beam entering an accelerator cavity excites higher order modes(HOM). These are radiated to HOM couplers and subsequently damped. They canalso be used to facilitate beam position monitoring. The modes excited byoff-axis beams are the focus of this study. Results are presented on the firstanalysis of HOM dependency on the beam position for the third harmonic cavitiesat FLASH. The analysis is based on the beampipe and cavity dipole modes.Various analysis methods are used and compared to satisfy the needs emergingfrom the characteristics of those modes. The electric center of each mode isobserved by looking for the minima of the HOM signals of different beampositions. A single electron bunch per RF pulse is used.

Beam-based HOM Study in Third Harmonic SC Cavities for Beam Alignment at FLASH