Link do spotkania w aplikacji Microsoft Teams: https://tiny.pl/7rh-3zyz

Abstract

The main objective of the optimized stellarator Wendelstein 7-X (W7-X) is the demonstration of steady-state plasma operation at fusion-relevant plasma parameters, thereby verifying that the stellarator is a viable fusion power plant concept. The first plasma operation started in December 2015 and continued until March 2023. Since then, the Pulse Height Analysis diagnostics (PHA) initiated by IPPLM have been operational, providing a wide range of spectra in the soft X-ray range. Nevertheless, after approximately 10 years of operation, the PHA diagnostics requires modernization. The modernization plan aims to increase the spectrometer measurement capabilities to operate at high counting rates, which improves statistics. The plan also aims to provide new, improved silicon drift detectors (SDD) with low-noise CUBE preamplifiers to minimize signal-to-noise ratio such that we can operate with much shorter peaking times. A special vacuum stand was built equipped with an X-ray tube to perform calibration measurements at high counting rates imitating the experimental conditions during operation at W7-X. Optimisation of the operation of individual measurement channels is ongoing. Several performance improvement results will be discussed. Further modernization is closely related to the new digital signal processor, which will allow for separating pile-up events rather than removing them. The work is carried out as part of collaboration between IPP and IPP Greifswald in terms of EUROfusion project.