Speakers
Description
The MAX IV storage rings use passive Landau cavities to achieve the desired bunch lengthening, and thus the desired performance in terms of beam lifetime and beam stability. It is therefore important to know the magnitude of the fields in these cavities during operation. Since the Landau cavities are passive, the calibration has to be done with beam present and is usually done at low current and at the cavity resonance. These calibrations are only as good as the modelled or measured shunt impedance of the cavity. Here, we will present an alternative off-resonance calibration scheme, which is performed at conditions more similar to standard operation during delivery to beam lines. This method is also less dependent on how accurately the shunt impedance can be determined.
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