Abstract

During the commissioning phase of the SASE3 soft X-ray beamline, the intensity tuning gas-based device has been operated and its performance has been qualified for different beamline optics configurations by means of the different photon diagnostic components available at the time. The combined used of a X-ray gas monitor (“XGM”) upstream the Gas Attenuator with both, imagers and MCP detectors, downstream the active gas cell, has been shown as a valid method to study the transmission function of the device. By performing relatively simple correlation analysis of the signals for different pressures, it has been found a good agreement between the theoretical model and the experiments, including the evaluation of the contribution of higher harmonic photons to the total transmitted intensity. Since the XGM´s and the MCP-based detectors provide a sufficient time resolution, this combination of devices enables further studies of some found indications regarding higher repetition rates effects on the transfer function of the Gas Attenuator.

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