Author: Bieler, M.
Paper Title Page
TUPOMS015 Proposal of a Girder Realignment Test in PETRA III 1435
 
  • M. Schaumann, I.V. Agapov, R. Bartolini, M. Bieler, R. Böspflug, D. Einfeld, M.G. Hoffmann, J. Keil, L. Liao, G. Priebe, M. Schlösser, R. Wanzenberg
    DESY, Hamburg, Germany
 
  PETRA IV can benefit from the fine control of the girders that carry the storage ring elements to achieve the design beam performance. Based on the corrector magnet strength pattern it is desired to realign girders to stay within the alignment tolerances. In the current PETRA III configuration, the girders in the Max von Laue Hall are equipped for remote alignment, however, those have not been moved since their initial installation and the alignment system is currently not connected to the control system. In preparation for PETRA IV, a movement test of one of the PETRA III girders should confirm the ability to safely and precisely remote control the equipment based on an optics model that describes the effect of the girder movement on the orbit. This paper studies the feasibility of this test and prepares an initial mock-up experiment to be performed on a spare girder.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOMS015  
About • Received ※ 07 June 2022 — Revised ※ 13 June 2022 — Accepted ※ 14 June 2022 — Issue date ※ 15 June 2022
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TUPOMS020 Long-Term Orbit Stability in the PETRA III Storage Ring 1449
 
  • L. Liao, M. Bieler, J. Keil, C. Li, M. Schaumann, R. Wanzenberg
    DESY, Hamburg, Germany
 
  The study of long-term orbit stability in the PETRA III light source plays an important role for the design of its upgrade to PETRA IV. The PETRA III tunnel is made of individual segments that move against each other. Here, the long-term drifts of the tunnel ground that are mostly introduced by temperature variations, are of the highest concern for the PETRA IV alignment tolerances and orbit stability. This paper studies the evolution of the beam orbit and corrector magnet currents over several years and correlates tunnel movement to RMS orbit drifts.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOMS020  
About • Received ※ 16 May 2022 — Revised ※ 12 June 2022 — Accepted ※ 13 June 2022 — Issue date ※ 06 July 2022
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TUPOMS021 PETRA III Operational Performance and Availability 1453
 
  • R. Wanzenberg, M. Bieler, J. Keil, L. Liao, G.K. Sahoo, M. Schaumann
    DESY, Hamburg, Germany
 
  At DESY the Synchrotron Light Source PETRA III offers scientists outstanding opportunities for experiments with hard X-rays of exceptionally high brilliance since 2009. The light source is operated mainly in two operation modes with 480 and 40 bunches at a beam energy of 6 GeV. With the completion of the last milestone of the extension project in summer 2021 that brought the new dipole beamline P66 into operation, 2022 is the first year where almost 5000 hours of user run time could be scheduled. This paper will review the statistics of availability and failures over the years and provides a detailed description of the operation in 2021. Additionally, an outlook for the next runs is given.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOMS021  
About • Received ※ 19 May 2022 — Revised ※ 13 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 17 June 2022
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THPOST001 Temperature Effects on the PETRA III Tunnel Stability 2432
 
  • M. Schaumann, M. Bieler, J. Keil, J. Klute, L. Liao, R. Wanzenberg
    DESY, Hamburg, Germany
 
  The tunnel of the synchrotron light source PETRA III is build from separate segments that are joint together every 24 m. The normal conducting magnets heat up the tunnel when operating, which leads to an expansion of the concrete walls and floor introducing movements between the tunnels segments. Especially during warm-up periods after shutdowns, this results in a drift of the accelerator elements that is transferred on the circulating beam over a duration of days, weeks or months according to the length of the cool-down period. This paper shows that not only inside temperature effects but also seasonal temperature changes are relevant.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOST001  
About • Received ※ 07 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 20 June 2022  
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