ICALEPCS2019 - List of Authors (Froehlich, L.)

Paper	Title	Page
MOPHA069	Automation of the Undulator Middle Plane Alignment Relative to the Electron Beam Position Using the K-Monochromator	375
	S. Karabekyan, S. Abeghyan, W. Freund EuXFEL, Schenefeld, Germany L. Fröhlich DESY, Hamburg, Germany
	The correct K value of an undulator is an important parameter to achieve lasing conditions at free electron lasers. The accuracy of the installation of the undulator in the tunnel is limited by the accuracy of the instruments used in surveying. Moreover, the position of the electron beam also varies depending on its alignment. Another source of misalignment is ground movement and the resulting change in the position of the tunnel. All this can lead to misalignment of the electron beam position relative to the center of the undulator gap up to several hundred microns. That, in turn, will lead to a deviation of the ΔK/K parameter several times higher than the tolerance requirement. An automated method of aligning the middle plane of the undulator, using a K-monochromator, was developed and used at European XFEL. Details of the method are described in this article. The results of the K value measurements are discussed.
	Poster MOPHA069 [0.780 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2019-MOPHA069
About •	paper received ※ 30 September 2019 paper accepted ※ 10 October 2019 issue date ※ 30 August 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPHA161	Revisiting the Bunch-Synchronized Data Acquisition System for the European XFEL Accelerator	1460
	T. Wilksen, A. Aghababyan, L. Fröhlich, O. Hensler, R. Kammering, K. Rehlich, V. Rybnikov DESY, Hamburg, Germany
	After about two years in operation the bunch-synchronized data acquisition as used with the accelerator control system at the European XFEL is being revisited and reevaluated. As we have now gained quite some experience with the current system design it was found to have shortfalls specifically with respect to the offered methods for data retrieval and management. In the context of modern data collection and management technologies readily in use by huge internet companies, new frameworks are being evaluated as a control-system independent replacement for data reduction, processing and online analysis. The main focus here is currently put on streaming technologies. Different approaches are being discussed in this paper and reviewed for feasibility and adaptability for control system architectures used at DESY’s accelerator facilities.
	Poster WEPHA161 [2.687 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2019-WEPHA161
About •	paper received ※ 27 September 2019 paper accepted ※ 20 October 2019 issue date ※ 30 August 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRAPP05	Review of Commissioning and First User Operation in Respect to High Level Controls at the European XFEL	1665
	R. Kammering, B. Beutner, W. Decking, L. Fröhlich, O. Hensler, T. Limberg, S.M. Meykopff, M. Scholz, J. Wilgen DESY, Hamburg, Germany
	In September 2017 the European XFEL entered user operation after years of construction and one year of commissioning. To provide a fast and flexible startup of the various sections of the machine, the high-level control software was essential from the beginning. While progressing in commissioning and increasing operation parameter space, the enormous complexity of the European XFEL put hard requirements on the control and operation concepts. Having now the full baseline parameters reached, this paper will review the high-level software concepts and architecture in respect to effectiveness, reliability and ease of operation. Beside a review of the high-level software concepts and design ideas also general operation concepts and the interoperability between the various sub-systems in respect to the overall facility performance will be presented.
	Slides FRAPP05 [12.121 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2019-FRAPP05
About •	paper received ※ 30 September 2019 paper accepted ※ 10 October 2019 issue date ※ 30 August 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Automation of the Undulator Middle Plane Alignment Relative to the Electron Beam Position Using the K-Monochromator

375

S. Karabekyan, S. Abeghyan, W. Freund
EuXFEL, Schenefeld, Germany
L. Fröhlich
DESY, Hamburg, Germany

The correct K value of an undulator is an important parameter to achieve lasing conditions at free electron lasers. The accuracy of the installation of the undulator in the tunnel is limited by the accuracy of the instruments used in surveying. Moreover, the position of the electron beam also varies depending on its alignment. Another source of misalignment is ground movement and the resulting change in the position of the tunnel. All this can lead to misalignment of the electron beam position relative to the center of the undulator gap up to several hundred microns. That, in turn, will lead to a deviation of the ΔK/K parameter several times higher than the tolerance requirement. An automated method of aligning the middle plane of the undulator, using a K-monochromator, was developed and used at European XFEL. Details of the method are described in this article. The results of the K value measurements are discussed.

Poster MOPHA069 [0.780 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2019-MOPHA069

About •

paper received ※ 30 September 2019 paper accepted ※ 10 October 2019 issue date ※ 30 August 2020

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPHA161

Revisiting the Bunch-Synchronized Data Acquisition System for the European XFEL Accelerator

1460

T. Wilksen, A. Aghababyan, L. Fröhlich, O. Hensler, R. Kammering, K. Rehlich, V. Rybnikov
DESY, Hamburg, Germany

After about two years in operation the bunch-synchronized data acquisition as used with the accelerator control system at the European XFEL is being revisited and reevaluated. As we have now gained quite some experience with the current system design it was found to have shortfalls specifically with respect to the offered methods for data retrieval and management. In the context of modern data collection and management technologies readily in use by huge internet companies, new frameworks are being evaluated as a control-system independent replacement for data reduction, processing and online analysis. The main focus here is currently put on streaming technologies. Different approaches are being discussed in this paper and reviewed for feasibility and adaptability for control system architectures used at DESY’s accelerator facilities.

Poster WEPHA161 [2.687 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2019-WEPHA161

About •

paper received ※ 27 September 2019 paper accepted ※ 20 October 2019 issue date ※ 30 August 2020

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRAPP05

Review of Commissioning and First User Operation in Respect to High Level Controls at the European XFEL

1665

R. Kammering, B. Beutner, W. Decking, L. Fröhlich, O. Hensler, T. Limberg, S.M. Meykopff, M. Scholz, J. Wilgen
DESY, Hamburg, Germany

In September 2017 the European XFEL entered user operation after years of construction and one year of commissioning. To provide a fast and flexible startup of the various sections of the machine, the high-level control software was essential from the beginning. While progressing in commissioning and increasing operation parameter space, the enormous complexity of the European XFEL put hard requirements on the control and operation concepts. Having now the full baseline parameters reached, this paper will review the high-level software concepts and architecture in respect to effectiveness, reliability and ease of operation. Beside a review of the high-level software concepts and design ideas also general operation concepts and the interoperability between the various sub-systems in respect to the overall facility performance will be presented.

Slides FRAPP05 [12.121 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2019-FRAPP05

About •

paper received ※ 30 September 2019 paper accepted ※ 10 October 2019 issue date ※ 30 August 2020

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)