Speaker
Description
The European X-ray Free Electron Laser facility in Germany delivers pulses with femtosecond pulse lengths at repetition rates up to 4.5 MHz. The X-ray photon diagnostics group provides reliable measurement devices and feedback systems for monitoring and controlling the properties of the FEL radiation which is created by the Self Amplified Spontaneous Emission (SASE) process. The stochastic nature of this process gives rise to fluctuations in the pulse energy and spectrum from shot-to-shot. To cover these variations, the HIgh REsolution hard X-ray single shot (HIREX) spectrometer has been installed in the SASE1 and SASE2 undulator beamlines to provide feedback for machine optimization. The spectrometer is an online device, based on a bent diamond crystal as a dispersive element and an MHz-acquisition rate strip detector. The goal is to automate the repetitive setup and alignment tasks without expert involvement. The time saved could then be recuperated by users to collect more, high quality, scientific data. Here, automation involves aligning the crystals and detector in the FEL beam, while minimizing human intervention by continuously monitoring the spectrometer and making or suggesting the necessary adjustments during operation. In this contribution we will discuss the newly developed automatic alignment of the spectrometer.
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