IBIC2021 - List of Authors (Schmidt-Foehre, F.)

Paper	Title	Page
MOPP30	Tests of the New BPM Long Term Drift Stabilization Scheme Based on External Crossbar Switching at PETRA III	123
	G. Kube, F. Schmidt-Föhre, K. Wittenburg DESY, Hamburg, Germany A. Bardorfer, L. Bogataj, M. Cargnelutti, P. Leban, P. Paglovec, B. Repič I-Tech, Solkan, Slovenia
	The PETRA IV project at DESY aims to upgrade the present synchrotron radiation source PETRA III at DESY into an ultralow-emittance source which will be diffraction limited up to X-rays of about 10 keV. Using a multi bend achromat lattice, the small PETRA beam emittance translates directly into much smaller beam sizes at the insertion device source points, thus imposing stringent requirements on machine stability. In order to measure beam positions and control orbit stability to the requisite level of accuracy, a high resolution BPM system will be installed which consists of about 700 individual monitors with the readout electronics based on MTCA.4 as technical platform. In order to fulfill the requested long-term drift requirement to be less than 1 micron over a period of seven days, due to the PETRA-specific machine geometry the BPM cable paths have to be stabilized in addition. To achieve this demand, the well proven concept of crossbar switching was extended such that the analogue switching part is separated from the read-out electronics and brought as close as possible to the BPM pickup. This contribution summarizes first proof-of-principle measurements which were performed in the lab and at PETRA III using a modified Libera Brilliance⁺ with external switching matrix. These measurements indicate that the concept of external switching works well and that the performance of this modified test setup fulfills the specifications.
	Poster MOPP30 [1.880 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2021-MOPP30
About •	paper received ※ 08 September 2021 paper accepted ※ 15 September 2021 issue date ※ 27 October 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPP36	Comparison of Two Long Term Drift Stabilization Schemes for BPM Systems	145
	F. Schmidt-Föhre, G. Kube, K. Wittenburg DESY, Hamburg, Germany
	For the planned upgrade of synchrotron radiation sources PETRA (called PETRA IV) at DESY a much higher beam brilliance is requested. In order to measure according beam positions and to control orbit stability to the corresponding level of accuracy, a future high-resolution BPM system has to deliver the necessary requirements on machine stability. This needs to enable long-term drift requirements of even less than 1 micron beam position deviation per week. Such a specification goal requires an additional long-term drift stabilization of the beam position monitor (BPM) readout scheme for PETRA IV, which will include a compensation of BPM cable parameter drifts. This paper discusses a comparison of two common compensation schemes using different signal conditioning features, typically needed at machine topologies with long BPM cable paths. Certain critical aspects of the different schemes are discussed in this report, while existing successful measurements are referred in some references.
	Poster MOPP36 [0.314 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2021-MOPP36
About •	paper received ※ 08 September 2021 paper accepted ※ 17 September 2021 issue date ※ 13 October 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Tests of the New BPM Long Term Drift Stabilization Scheme Based on External Crossbar Switching at PETRA III

123

G. Kube, F. Schmidt-Föhre, K. Wittenburg
DESY, Hamburg, Germany
A. Bardorfer, L. Bogataj, M. Cargnelutti, P. Leban, P. Paglovec, B. Repič
I-Tech, Solkan, Slovenia

The PETRA IV project at DESY aims to upgrade the present synchrotron radiation source PETRA III at DESY into an ultralow-emittance source which will be diffraction limited up to X-rays of about 10 keV. Using a multi bend achromat lattice, the small PETRA beam emittance translates directly into much smaller beam sizes at the insertion device source points, thus imposing stringent requirements on machine stability. In order to measure beam positions and control orbit stability to the requisite level of accuracy, a high resolution BPM system will be installed which consists of about 700 individual monitors with the readout electronics based on MTCA.4 as technical platform. In order to fulfill the requested long-term drift requirement to be less than 1 micron over a period of seven days, due to the PETRA-specific machine geometry the BPM cable paths have to be stabilized in addition. To achieve this demand, the well proven concept of crossbar switching was extended such that the analogue switching part is separated from the read-out electronics and brought as close as possible to the BPM pickup. This contribution summarizes first proof-of-principle measurements which were performed in the lab and at PETRA III using a modified Libera Brilliance⁺ with external switching matrix. These measurements indicate that the concept of external switching works well and that the performance of this modified test setup fulfills the specifications.

Poster MOPP30 [1.880 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2021-MOPP30

About •

paper received ※ 08 September 2021 paper accepted ※ 15 September 2021 issue date ※ 27 October 2021

Export •

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

MOPP36

Comparison of Two Long Term Drift Stabilization Schemes for BPM Systems

145

F. Schmidt-Föhre, G. Kube, K. Wittenburg
DESY, Hamburg, Germany

For the planned upgrade of synchrotron radiation sources PETRA (called PETRA IV) at DESY a much higher beam brilliance is requested. In order to measure according beam positions and to control orbit stability to the corresponding level of accuracy, a future high-resolution BPM system has to deliver the necessary requirements on machine stability. This needs to enable long-term drift requirements of even less than 1 micron beam position deviation per week. Such a specification goal requires an additional long-term drift stabilization of the beam position monitor (BPM) readout scheme for PETRA IV, which will include a compensation of BPM cable parameter drifts. This paper discusses a comparison of two common compensation schemes using different signal conditioning features, typically needed at machine topologies with long BPM cable paths. Certain critical aspects of the different schemes are discussed in this report, while existing successful measurements are referred in some references.

Poster MOPP36 [0.314 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2021-MOPP36

About •

paper received ※ 08 September 2021 paper accepted ※ 17 September 2021 issue date ※ 13 October 2021

Export •

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