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Thesis defense of Stephan-Robert Kötter

Begin: End: Location: ZOOM
Event type:
  • Defense

Orbit Correction and Response Analysis at DELTA

The DELTA facility is a synchrotron light source located in Dortmund, Germany. Here, the TU Dortmund University operates a 1.5 GeV storage ring supplying radiation ranging from the THz to the hard X-ray regime for experiments in chemistry, biochemistry, solid-state physics and materials science. The ring is equipped with a slow orbit feedback (SOFB) that corrects the transverse orbit position using a set of steerer magnets. The orbit correction software acts as the feedback's controller. Until 2021, the ring used a program based on a customized singular value decomposition (SVD) approach for calculating corrections. Its replacement, which is better integrated into the experimental physics and industrial control system (EPICS) and also capable of two methods of energy correction, was implemented and commissioned to routine operation within the scope of this work. Additionally, the closed-orbit bilinear-exponential analysis (COBEA) algorithm was generalized to accept combinations of orbit response matrix columns, so-called response sets, as input. This enables the new response set t algorithm (RSFA) to extract the coupled beta functions and betatron phase advances as well as the scaled dispersion from orbit corrections. If it is integrated with the SOFB in an online tting approach, the RSFA will supply non-invasive measurements of these optical functions. The new orbit correction software and algorithm are described and evaluated in simulations as well as experimental studies.


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Location & approach

The campus of the Technical University of Dortmund is located near the freeway junction Dortmund West, where the Sauerland line A45 crosses the Ruhr expressway B1/A40. The Dortmund-Eichlinghofen exit on the A45 leads to the South Campus, the Dortmund-Dorstfeld exit on the A40 leads to the North Campus. The university is signposted at both exits.

The "Dortmund Universität" S-Bahn station is located directly on the North Campus. From there, the S-Bahn line S1 runs every 20 or 30 minutes to Dortmund main station and in the opposite direction to Düsseldorf main station via Bochum, Essen and Duisburg. In addition, the university can be reached by bus lines 445, 447 and 462. Timetable information can be found on the homepage of the Rhine-Ruhr transport association, and DSW21 also offer an interactive route network map.



One of the landmarks of the TU Dortmund is the H-Bahn. Line 1 runs every 10 minutes between Dortmund Eichlinghofen and the Technology Center via Campus South and Dortmund University S, while Line 2 commutes every 5 minutes between Campus North and Campus South. It covers this distance in two minutes.



From Dortmund Airport, it takes just over 20 minutes to get to Dortmund Central Station by AirportExpress and from there to the university by S-Bahn. A wider range of international flight connections is offered by Düsseldorf Airport, about 60 kilometers away, which can be reached directly by S-Bahn from the university's train station.

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The facilities of TU Dortmund University are spread over two campuses, the larger Campus North and the smaller Campus South. Additionally, some areas of the university are located in the adjacent "Technologiepark".

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