Abstract

The development effort is driven by the need for a new type of x‐ray beam position monitor (XBPM), which will detect the centre of gravity of the undulator beam. XBPMs based on the ionization of a residual gas are considered being the candidate for this future “white” undulator beam XBPMs. A number of residual gas XBPM prototypes for the PETRA III storage ring were developed and tested. Tests were performed at DESY and the ESRF, resolution of beam position up to 5 μm is reported. The further development of the RGXBPMs will be focused on improvements of resolution, readout speed and reliability.

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