HB2023 - List of Authors (Shishlo, A.P.)

Paper	Title	Page
TUC1C1	Effect of Three-Dimensional Quadrupole Magnet Model on Beam Dynamics in the FODO Line at the Spallation Neutron Source Beam Test Facility	65
	T.E. Thompson ORNL RAD, Oak Ridge, Tennessee, USA A.V. Aleksandrov, T.V. Gorlov, K.J. Ruisard, A.P. Shishlo ORNL, Oak Ridge, Tennessee, USA
	Funding: Supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics. Authored by UT- Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The research program at the Spallation Neutron Source (SNS) Beam Test Facility (BTF) focuses on improving accelerator model accuracy. This study explores the effect of two different models of permanent magnet quadrupoles, which comprise a 9.5-cell FODO line in the BTF. The more realistic model includes all higher-order terms, while the simple, in use model, is a perfect quadrupole. Particular attention is paid to high-amplitude particles to understand how the choice of quadrupole model will affect beam halo distributions. In this paper, we compare particle tracking through a FODO line that contains only linear terms - a perfect quadrupole model - to a full 3D model.
	Slides TUC1C1 [1.705 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-TUC1C1
About •	Received ※ 01 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 27 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUC1C2	The Impact of High-Dimensional Phase Space Correlations on the Beam Dynamics in a Linear Accelerator	68
	A.M. Hoover, A.V. Aleksandrov, S.M. Cousineau, K.J. Ruisard, A.P. Shishlo, A.P. Zhukov ORNL, Oak Ridge, TN, USA
	Hadron beams develop intensity-dependent transverse-longitudinal correlations within radio-frequency quadrupole (RFQ) accelerating structures. These correlations are only visible in six-dimensional phase space and are destroyed by reconstructions from low-dimensional projections. In this work, we estimate the effect of artificial decorrelation on the beam dynamics in the Spallation Neutron Source (SNS) linac and Beam Test Facility (BTF). We show that the evolution of a realistic initial distribution and its decorrelated twin converge during the early acceleration stages; thus, low-dimensional projections are probably sufficient for detailed predictions in high-power linacs.
	Slides TUC1C2 [6.573 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-TUC1C2
About •	Received ※ 01 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 13 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUC2I2	SNS Linac Beam Dynamics: What We Understand, and What We Don’t	91
	A.P. Shishlo ORNL, Oak Ridge, Tennessee, USA
	Funding: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. At this moment, the Spallation Neutron Source linac accelerates H⁻ ions to 1.05 GeV before they injected into the ring. The beam power on the target is 1.7 MW. The linac includes three main parts - a front-end with ion source, RFQ, and Medium Energy Beam Transport (MEBT) section; a normal temperature linac with Drift Tube Linac (DTL) and Coupled Cavities Linac (CCL); and superconducting linac (SCL). The linac has been in operation since it was commissioned in 2005. This talk discusses the results of beam dynamics studies, existing diagnostic devices, simulation codes and models used in analysis, development and results of linac tuning procedures, and beam loss reduction efforts performed at the SNS linac for 18 years. Considerations about future beam physics experiments and simulations software improvements are presented.
	Slides TUC2I2 [1.814 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-TUC2I2
About •	Received ※ 29 September 2023 — Revised ※ 06 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 25 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUC2C2	Evaluating PyORBIT as Unified Simulation Tool for Beam-Dynamics Modeling of the ESS Linac	102
	J.F. Esteban Müller, Y. Levinsen, N. Milas, C.Z. Zlatanov ESS, Lund, Sweden A.P. Shishlo, A.P. Zhukov ORNL, Oak Ridge, Tennessee, USA
	The design of the ESS proton linac was supported by the simulation code TraceWin, a closed-source commercial software for accurate multiparticle simulations. Conversely, the high-level physics applications used for beam commissioning and machine tuning rely on the Open XAL framework and its online model for fast envelope simulations. In this paper, we evaluate PyORBIT for both online modeling of the linac for machine commissioning and tuning as well as for more accurate offline simulations for beam-dynamics studies. We present the modifications done to the code to adapt it to this use case, namely porting the code to Python 3, adding an envelope tracker, and integrating with the EPICS control systems. Finally, we show the results of benchmarking PyORBIT against our current modeling tools.
	Slides TUC2C2 [0.886 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-TUC2C2
About •	Received ※ 08 October 2023 — Revised ※ 09 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 14 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Effect of Three-Dimensional Quadrupole Magnet Model on Beam Dynamics in the FODO Line at the Spallation Neutron Source Beam Test Facility

65

T.E. Thompson
ORNL RAD, Oak Ridge, Tennessee, USA
A.V. Aleksandrov, T.V. Gorlov, K.J. Ruisard, A.P. Shishlo
ORNL, Oak Ridge, Tennessee, USA

Funding: Supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics. Authored by UT- Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy.
The research program at the Spallation Neutron Source (SNS) Beam Test Facility (BTF) focuses on improving accelerator model accuracy. This study explores the effect of two different models of permanent magnet quadrupoles, which comprise a 9.5-cell FODO line in the BTF. The more realistic model includes all higher-order terms, while the simple, in use model, is a perfect quadrupole. Particular attention is paid to high-amplitude particles to understand how the choice of quadrupole model will affect beam halo distributions. In this paper, we compare particle tracking through a FODO line that contains only linear terms - a perfect quadrupole model - to a full 3D model.

Slides TUC1C1 [1.705 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-TUC1C1

About •

Received ※ 01 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 27 October 2023

Cite •

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

TUC1C2

The Impact of High-Dimensional Phase Space Correlations on the Beam Dynamics in a Linear Accelerator

68

A.M. Hoover, A.V. Aleksandrov, S.M. Cousineau, K.J. Ruisard, A.P. Shishlo, A.P. Zhukov
ORNL, Oak Ridge, TN, USA

Hadron beams develop intensity-dependent transverse-longitudinal correlations within radio-frequency quadrupole (RFQ) accelerating structures. These correlations are only visible in six-dimensional phase space and are destroyed by reconstructions from low-dimensional projections. In this work, we estimate the effect of artificial decorrelation on the beam dynamics in the Spallation Neutron Source (SNS) linac and Beam Test Facility (BTF). We show that the evolution of a realistic initial distribution and its decorrelated twin converge during the early acceleration stages; thus, low-dimensional projections are probably sufficient for detailed predictions in high-power linacs.

Slides TUC1C2 [6.573 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-TUC1C2

About •

Received ※ 01 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 13 October 2023

Cite •

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

TUC2I2

SNS Linac Beam Dynamics: What We Understand, and What We Don’t

91

A.P. Shishlo
ORNL, Oak Ridge, Tennessee, USA

Funding: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy.
At this moment, the Spallation Neutron Source linac accelerates H⁻ ions to 1.05 GeV before they injected into the ring. The beam power on the target is 1.7 MW. The linac includes three main parts - a front-end with ion source, RFQ, and Medium Energy Beam Transport (MEBT) section; a normal temperature linac with Drift Tube Linac (DTL) and Coupled Cavities Linac (CCL); and superconducting linac (SCL). The linac has been in operation since it was commissioned in 2005. This talk discusses the results of beam dynamics studies, existing diagnostic devices, simulation codes and models used in analysis, development and results of linac tuning procedures, and beam loss reduction efforts performed at the SNS linac for 18 years. Considerations about future beam physics experiments and simulations software improvements are presented.

Slides TUC2I2 [1.814 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-TUC2I2

About •

Received ※ 29 September 2023 — Revised ※ 06 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 25 October 2023

Cite •

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

TUC2C2

Evaluating PyORBIT as Unified Simulation Tool for Beam-Dynamics Modeling of the ESS Linac

102

J.F. Esteban Müller, Y. Levinsen, N. Milas, C.Z. Zlatanov
ESS, Lund, Sweden
A.P. Shishlo, A.P. Zhukov
ORNL, Oak Ridge, Tennessee, USA

The design of the ESS proton linac was supported by the simulation code TraceWin, a closed-source commercial software for accurate multiparticle simulations. Conversely, the high-level physics applications used for beam commissioning and machine tuning rely on the Open XAL framework and its online model for fast envelope simulations. In this paper, we evaluate PyORBIT for both online modeling of the linac for machine commissioning and tuning as well as for more accurate offline simulations for beam-dynamics studies. We present the modifications done to the code to adapt it to this use case, namely porting the code to Python 3, adding an envelope tracker, and integrating with the EPICS control systems. Finally, we show the results of benchmarking PyORBIT against our current modeling tools.

Slides TUC2C2 [0.886 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-TUC2C2

About •

Received ※ 08 October 2023 — Revised ※ 09 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 14 October 2023

Cite •

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