München 2019 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 14: Radiofrequency 2
AKBP 14.3: Vortrag
Donnerstag, 21. März 2019, 14:30–14:45, HS 7
Nitrogen Infusion R&D for continuous wave operation at DESY — •Christopher Bate1,2, Arti Dangwal Pandey1, Wolfgang Hillert2, Detlef Reschke1, Jörn Schaffran1, Guilherme Della Lana Semione1, Sven Sievers1, Lea Steder1, Andreas Stierle1, Hans Weise1, and Marc Wenskat1 — 1DESY, Hamburg, Deutschland — 2Universität Hamburg, Deutschland
The European XFEL continuous wave upgrade requires cavities with reduced surface resistance (high Q-values) for high duty cycle while maintaining high accelerating gradient for short-pulse operation. A possible way to meet the requirements is the so-called nitrogen infusion procedure. However, a fundamental understanding and a theoretical model of this method are still missing. The approach presented here is based on sample R&D, with the goal to identify all key parameters of the process and establish a stable, reproducible recipe. To understand the underlying processes of the surface evolution, which yield in improved cavity performance, advanced surface analysis techniques (e.g. SEM/EDX, TEM, XPS, TOF-SIMS) are utilized and several kinds of samples - such as in-situ model samples, cavity cut-outs, and samples treated together with cavities, are analyzed. Results of these analyses, their implications for the cavity R&D and next steps are presented.