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Shutter-type multi-point optical alignment using a Structured Laser Beam in vacuum / Niewiem, Witold Grzegorz (ETH, Zurich (main) ; CERN) ; Figura, Sebastian Antoni (CERN) ; Dusek, Martin (Liberec Tech. U. ; CERN) ; Mergelkuhl, Dirk (CERN) ; Gayde, Jean-Christophe (CERN) ; Wieser, Andreas (ETH, Zurich (main))
This paper presents an alignment concept employing a Structured Laser Beam (SLB) for offset measurements over a 140 m distance. The prototype consists of an SLB generator and three measurement stations within a vacuum system. [...]
CERN-ACC-2025-0003.- Geneva : CERN, 2025 - 19 p. - Published in : JINST 20 (2025) P07001 Fulltext: PDF;

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First Steps Toward the Development of a Straight-Line Reference Alignment System for Future Accelerators at CERN Using Pseudo-Nondiffracting Layer Beams / Dušek, Martin (CERN ; Liberec Tech. U.) ; Figura, Sebastian (CERN ; Cracow Tech. U.) ; Polak, Jakub Michal (CERN) ; Kamugasa, Solomon William (CERN) ; Mergelkuhl, Dirk (CERN) ; Niewiem, Witold (CERN ; ETH, Zurich (main)) ; Kunc, Štěpán (Liberec Tech. U.) ; Gayde, Jean-Christophe (CERN) ; Šulc, Miroslav (Liberec Tech. U. ; Prague, Inst. Plasma Phys.)
This paper presents experimental results that allow for the performance evaluation of a straight-line reference alignment system based on pseudo-nondiffracting Layer beams. [...]
arXiv:2506.15234. - 2025 - 19.
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Status of geodetic studies and alignment perspectives for the CERN future circular collider / Weyer, Benjamin (CERN) ; Watrelot, Leonard ; Niewiem, Witold Grzegorz (ETH Zurich (CH))
The ongoing feasibility study for the Future Circular Collider (FCC-ee), which is planned to be built at CERN, raises survey and geodetic challenges. [...]
CERN-ACC-NOTE-2024-0031. - 2024 - 7.
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Influence of symmetry breaking on the inner core of a structured laser beam / Niewiem, Witold (CERN ; Zurich, ETH) ; Polak, Krystof (CERN ; Liberec Tech. U.) ; Figura, Sebastian (CERN ; Cracow Tech. U.) ; Mergelkuhl, Dirk (CERN) ; Gayde, Jean-Christophe (CERN) ; Wieser, A (Zurich, ETH)
2025 - 13 p. - Published in : Opt. Express 33 (2025) 19664-19676 External links: Fulltext; Fulltext

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An overview of progress with the study of a structured laser beam for alignment / Niewiem, Witold Grzegorz (ETH Zurich (CH)) ; Mergelkuhl, Dirk (CERN) ; Gayde, Jean-Christophe (CERN)
The Structured Laser Beam (SLB) is a pseudo-non- diffractive optical beam characterized by the low divergence of the Inner Core (IC), down to 10 μrad, and the presence of concentric rings, with the most prominent being the Outer Ring (OR). [...]
CERN-ACC-NOTE-2024-0025. - 2024 - 6.
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Variation of structured laser beam pattern and optimization for an alignment reference line creation / Niewiem, Witold (Zurich, ETH) ; Niewiem, Witold (CERN) ; Polak, Krystof (CERN) ; Polak, Krystof (Liberec Tech. U.) ; Dusek, Martin (CERN) ; Dusek, Martin (Liberec Tech. U.) ; Mergelkuhl, Dirk (CERN) ; Gayde, Jean-Christophe (CERN) ; Wieser, Andreas (Zurich, ETH) ; Sulc, Miroslav (Liberec Tech. U.) et al.
The alignment of particle accelerators demands a dedicated measurement system based on a straight-line reference. This straight line can be provided by a laser beam. [...]
2023 - 16 p. - Published in : Opt. Express 31 (2023) 43307-43322 Fulltext: PDF;

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The potential contribution of a structured laser beam to accelerator alignment technology / Gayde, Jean-Christophe (CERN) ; Dusek, Martin (CERN ; Liberec Tech. U.) ; Mergelkuhl, Dirk (CERN) ; Niewiem, Witold (CERN ; Zurich, ETH) ; Polak, Krystof (CERN ; Liberec Tech. U.) ; Roiková, Eva (Liberec Tech. U.) ; Sulc, Miroslav (Liberec Tech. U. ; Prague, Inst. Plasma Phys.)
The Structured Laser Beam (SLB) is a type of optical beam characterized by an intense, sharply defined, low divergence core at its center, similar in its transverse intensity distribution to a Bessel beam. The SLB can propagate over a theoretically infinite distance, and has recently been tested up to a distance of 900 m. [...]
2023 - Published in : JACoW IPAC 2023 (2023) THPA041 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPA041

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Detection of structured laser beam centroid and its use for alignment / Dusek, Martin (Liberec Technical University (CZ)) ; Polak, Krystof (Liberec Technical University (CZ)) ; Gayde, Jean-Christophe (CERN) ; Sulc, Miroslav (Liberec Technical University (CZ)) ; Mergelkuhl, Dirk (CERN) ; Niewiem, Witold Grzegorz (ETH Zurich (CH))
A Structured Laser Beam (SLB) [1] is a pseudo-non- diffractive optical beam. [...]
CERN-BE-2023-012. - 2022. - 5 p.
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Deformation measurement the ATLAS cavern at CERN / Niewiem, Witold Grzegorz (ETH Zurich (CH)) ; Mergelkuhl, Dirk (CERN) ; Gayde, Jean-Christophe (CERN)
Caverns for large physics detectors as the one for the Large Hadron Collider experiments sit nearly 100 m underground and measure several tens of meters in length, width and height. [...]
CERN-BE-2023-004. - 2022. - 6 p.
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4	Niewiem, W
5	Niewiem, Witold Grzegorz

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