FLS2023 - List of Authors (Goslawski, P.)

Paper	Title	Page
TU1B1	A Highly Competitive Non-Standard Lattice for a 4th Generation Light Source With Metrology and Timing Capabilities	58
	P. Goslawski, M. Abo-Bakr, J. Bengtsson, K. Holldack, Z. Hüsges, A. Jankowiak, K. Kiefer, B.C. Kuske, A. Meseck, R. Müller, M.K. Sauerborn, O. Schwarzkopf, J. Viefhaus, J. Völker HZB, Berlin, Germany
	The PTB, Germany’s national institute for standards and metrology, has relied on synchrotron radiation for metrology purposes for over 40 years and the most prominent customers are lithography systems from ASML/ZEIS. HZB is now working on a concept for a BESSY II successor, based on a 4th generation light source with an emittance of 100 pmrad @ 2.5 GeV. It is essential, that this new facility continues to serve the PTB for metrology purposes. This sets clear boundary conditions for the lattice design, in particular, the need for homogeneous bends as metrological radiation sources. Different Higher-Order-Multi-Bend-Achromat lattices have been developed, based on combined function gradient bends and homogeneous bends in a systematic lattice design approach. All lattices are linearly equivalent with the same emittance and maximum field strength. However, they differ significantly in their non-linear behavior. Based on this analysis, the choice of the BESSY III lattice type is motivated. A special focus is set also on TRIBs (Transverse Resonance Island Buckets) to operate with two orbits as a bunch separation scheme in MBAs, for different repetition rates or for the separation of short and long bunches.
	Slides TU1B1 [7.584 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU1B1
About •	Received ※ 23 August 2023 — Revised ※ 28 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WE4P31	Deterministic Approach to the Lattice Design of BESSY III	203
	B.C. Kuske, P. Goslawski HZB, Berlin, Germany
	Funding: Work supported by German Bundesministerium für Bildung und Forschung, Land Berlin, and grants of Helmholtz Association Since 2021 HZB pursues the design of a 2.5 GeV storage ring as a successor of BESSY II in Berlin. The user’s demand for diffraction-limited radiation at 1 keV corresponds to an emittance of 100 pm, making an MBA lattice indispensable. The envisaged location limits the circumference to ~350 m. MBA lattices are composed of smaller substructures that can be analyzed and optimized separately, before combining them into one super period. The prerequisite for this approach is a clear idea of the goal parameters and their prioritization, as the design process is dominated by permanent decisions between different options. The resulting generic baseline lattice for BESSY III is a simple structure with few non-linear elements, already fulfilling all goal parameters and showing a very compatible nonlinear behavior. This is our starting point for further optimizations including swarm or MOGA approaches.
DOI •	reference for this paper ※ doi:10.18429/JACoW-FLS2023-WE4P31
About •	Received ※ 30 August 2023 — Revised ※ 30 August 2023 — Accepted ※ 01 September 2023 — Issued ※ 02 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH3D5	Building Digital Models with thor_scsi: An Evolutionary Approach
	W. Sulaiman Khail, P. Goslawski, P. Schnizer HZB, Berlin, Germany
	Tracy is used as a computing core for digital models for synchrotron light sources since SLS. It inspired the accelerator toolbox, which is using (largely) Tracy’s Hamiltonian propagators. This Tracy code was refactored using modern software paradigms. It started with the Tracy III code base, reorganized its structure, and rebased it on a modern (cx+2a) coding style next to well-tested math libraries: but it is still using the tested Tracy propagators and code. This new code was renamed to thor-scsi, as its API was significantly reworked from the ones that Tracy II has established. Furthermore, a modern Python interfaces is provided, which is is based on pybind11. This new interface allows implementing beam line components using the Python language or tracking state spaces using truncated power series. Digital shadows or twins are essential ingredients for building 4th generation light sources. Based on the modernized thor_scsi code we built an EPICS IOC exporting required thor_scsi externals as EPICS variables. While it focuses on HZB’s current BESSY II and MLS, it is designed flexibly to extend to the BESSY III and MLS II project or similar light sources.
	Slides TH3D5 [1.038 MB]
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

A Highly Competitive Non-Standard Lattice for a 4th Generation Light Source With Metrology and Timing Capabilities

58

P. Goslawski, M. Abo-Bakr, J. Bengtsson, K. Holldack, Z. Hüsges, A. Jankowiak, K. Kiefer, B.C. Kuske, A. Meseck, R. Müller, M.K. Sauerborn, O. Schwarzkopf, J. Viefhaus, J. Völker
HZB, Berlin, Germany

The PTB, Germany’s national institute for standards and metrology, has relied on synchrotron radiation for metrology purposes for over 40 years and the most prominent customers are lithography systems from ASML/ZEIS. HZB is now working on a concept for a BESSY II successor, based on a 4th generation light source with an emittance of 100 pmrad @ 2.5 GeV. It is essential, that this new facility continues to serve the PTB for metrology purposes. This sets clear boundary conditions for the lattice design, in particular, the need for homogeneous bends as metrological radiation sources. Different Higher-Order-Multi-Bend-Achromat lattices have been developed, based on combined function gradient bends and homogeneous bends in a systematic lattice design approach. All lattices are linearly equivalent with the same emittance and maximum field strength. However, they differ significantly in their non-linear behavior. Based on this analysis, the choice of the BESSY III lattice type is motivated. A special focus is set also on TRIBs (Transverse Resonance Island Buckets) to operate with two orbits as a bunch separation scheme in MBAs, for different repetition rates or for the separation of short and long bunches.

Slides TU1B1 [7.584 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU1B1

About •

Received ※ 23 August 2023 — Revised ※ 28 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023

Cite •

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

WE4P31

Deterministic Approach to the Lattice Design of BESSY III

203

B.C. Kuske, P. Goslawski
HZB, Berlin, Germany

Funding: Work supported by German Bundesministerium für Bildung und Forschung, Land Berlin, and grants of Helmholtz Association
Since 2021 HZB pursues the design of a 2.5 GeV storage ring as a successor of BESSY II in Berlin. The user’s demand for diffraction-limited radiation at 1 keV corresponds to an emittance of 100 pm, making an MBA lattice indispensable. The envisaged location limits the circumference to ~350 m. MBA lattices are composed of smaller substructures that can be analyzed and optimized separately, before combining them into one super period. The prerequisite for this approach is a clear idea of the goal parameters and their prioritization, as the design process is dominated by permanent decisions between different options. The resulting generic baseline lattice for BESSY III is a simple structure with few non-linear elements, already fulfilling all goal parameters and showing a very compatible nonlinear behavior. This is our starting point for further optimizations including swarm or MOGA approaches.

DOI •

reference for this paper ※ doi:10.18429/JACoW-FLS2023-WE4P31

About •

Received ※ 30 August 2023 — Revised ※ 30 August 2023 — Accepted ※ 01 September 2023 — Issued ※ 02 December 2023

Cite •

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

TH3D5

Building Digital Models with thor_scsi: An Evolutionary Approach

W. Sulaiman Khail, P. Goslawski, P. Schnizer
HZB, Berlin, Germany

Tracy is used as a computing core for digital models for synchrotron light sources since SLS. It inspired the accelerator toolbox, which is using (largely) Tracy’s Hamiltonian propagators. This Tracy code was refactored using modern software paradigms. It started with the Tracy III code base, reorganized its structure, and rebased it on a modern (cx+2a) coding style next to well-tested math libraries: but it is still using the tested Tracy propagators and code. This new code was renamed to thor-scsi, as its API was significantly reworked from the ones that Tracy II has established. Furthermore, a modern Python interfaces is provided, which is is based on pybind11. This new interface allows implementing beam line components using the Python language or tracking state spaces using truncated power series. Digital shadows or twins are essential ingredients for building 4th generation light sources. Based on the modernized thor_scsi code we built an EPICS IOC exporting required thor_scsi externals as EPICS variables. While it focuses on HZB’s current BESSY II and MLS, it is designed flexibly to extend to the BESSY III and MLS II project or similar light sources.

Slides TH3D5 [1.038 MB]

Cite •

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