IPAC2017 - List of Authors (Laface, E.)

Paper	Title	Page
WEPIK084	Approximating Nonlinear Forces with Phase-Space Decoupling	3120
	B.T. Folsom, E. Laface ESS, Lund, Sweden
	Beam tracking software for accelerators typically falls into two categories: fast envelope simulations limited to linear beam optics, and slower multiparticle simulations that can model nonlinear effects. To find a middle ground between these approaches, we introduce virtual coordinates in position and momentum which have a cross-dependency (i.e. p=f(x) where x is an initial position and p is a virtual projection of momentum onto the position axis).This technique approximates multiparticle simulations with a significant reduction in calculation cost.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK084
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WEPIK085	Beam Shaping with 4N-order Multipole Magnets	3124
	B.T. Folsom, E. Laface ESS, Lund, Sweden
	A uniformly irradiating beam is beneficial in spallation for preventing irregular wear on the target. For octupoles (n = 4) and higher-order (n = 4N) magnets, passing charged-particle bunches undergo symmetric shaping effects along the x and y axes. Using a Lie-mapping formalism, we illustrate how well Gaussian distributions can be flattened symmetrically in 2D with single, dual-pulse, and RF magnets of 4N order. Incidental shaping effects are also discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK085
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THPAB137	New Approach in Developing Open XAL Applications	4043
	C. Rosati, E. Laface ESS, Lund, Sweden
	Open XAL project is a pure-Java open source development environment used for creating accelerator physics applications, scripts and services. Working with Open XAL requires developing a Java application with a prominent graphical user interface, allowing the final user to interact with the accelerator model, and to graphically view the results such interaction produced. Nevertheless the Open XAL support for specialized components (handling plotting, EPICS connection) and for a document-view application framework, relieving the developer of the burden related with this programming aspects, a lot of boilerplate code has still to be created, making the developer spending more time in UI than in accelerator physics code. In this paper a new approach in developing Open XAL applications is explained. Here the developer is relieved of the UI-related common code code by using software tools, allowing him to visually design the flow of data and events between the various elements of the applications (widgets and models), and automatically generate the application code, where code generation can be customized to use one of the available plugged programming languages (Java, Python, JS, …).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB137
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THPVA019	Self-consistent Space Charge Tracking Method based on Lie Transform	4454
	E. Laface, J.F. Esteban Müller ESS, Lund, Sweden
	In this paper we propose to describe the self-force of a particles beam, known as space charge, as an Hamiltonan term dependent on the distribution of the particles' coordinates: H_sc = H_sc(ρ(x,y,z)). This Hamiltonian is then used, together with the kinetic component H_k in a Lie transform to generate a transport map by e^{-L:H_k +H_sc}: where the Lie operator :H_k + H_sc: is defined according to the Dragt's notation [1]. Then the Lie transform is used to transport directly the distribution function ρ(x, y, z) in a self-consistent iterative algorithm. The result of this proof-of-concept idea is verified on a drift space and on a FODO channel and compared with a traditional multi-particles simulation code.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA019
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THPVA093	Open XAL Status Report 2017	4676
	A.P. Zhukov, C.K. Allen, A.P. Shishlo ORNL, Oak Ridge, Tennessee, USA D.A. Brown NMSU, Las Cruces, New Mexico, USA Y.-C. Chao SLAC, Menlo Park, California, USA C.P. Chu, Y. Li IHEP, Beijing, People's Republic of China J.F. Esteban Müller, B.T. Folsom, E. Laface, Y.I. Levinsen, C. Rosati ESS, Lund, Sweden P. Gillette, P. Laurent, E. Lécorché, G. Normand GANIL, Caen, France I. List, M. Pavleski Cosylab, Ljubljana, Slovenia X.H. Lu CSNS, Guangdong Province, People's Republic of China J.E. Muller CERN, Geneva, Switzerland
	The Open XAL accelerator physics software platform is being developed through an international collaboration among several facilities since 2010 The goal of the collaboration is to establish Open XAL as a multi-purpose software platform supporting a broad range of tool and application development in accelerator physics (Open XAL also ships with a suite of general purpose accelerator applications). This paper discusses progress in beam dynamics simulation, interaction with control system and software organization. We present the current status of the project, a roadmap for continued development and an overview of the project status at each participating facility.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA093
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Paper

Title

Page

Approximating Nonlinear Forces with Phase-Space Decoupling

3120

B.T. Folsom, E. Laface
ESS, Lund, Sweden

Beam tracking software for accelerators typically falls into two categories: fast envelope simulations limited to linear beam optics, and slower multiparticle simulations that can model nonlinear effects. To find a middle ground between these approaches, we introduce virtual coordinates in position and momentum which have a cross-dependency (i.e. p*=f(x) where x is an initial position and p* is a virtual projection of momentum onto the position axis).This technique approximates multiparticle simulations with a significant reduction in calculation cost.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK084

Export •

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

WEPIK085

Beam Shaping with 4N-order Multipole Magnets

3124

B.T. Folsom, E. Laface
ESS, Lund, Sweden

A uniformly irradiating beam is beneficial in spallation for preventing irregular wear on the target. For octupoles (n = 4) and higher-order (n = 4N) magnets, passing charged-particle bunches undergo symmetric shaping effects along the x and y axes. Using a Lie-mapping formalism, we illustrate how well Gaussian distributions can be flattened symmetrically in 2D with single, dual-pulse, and RF magnets of 4N order. Incidental shaping effects are also discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK085

Export •

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

THPAB137

New Approach in Developing Open XAL Applications

4043

C. Rosati, E. Laface
ESS, Lund, Sweden

Open XAL project is a pure-Java open source development environment used for creating accelerator physics applications, scripts and services. Working with Open XAL requires developing a Java application with a prominent graphical user interface, allowing the final user to interact with the accelerator model, and to graphically view the results such interaction produced. Nevertheless the Open XAL support for specialized components (handling plotting, EPICS connection) and for a document-view application framework, relieving the developer of the burden related with this programming aspects, a lot of boilerplate code has still to be created, making the developer spending more time in UI than in accelerator physics code. In this paper a new approach in developing Open XAL applications is explained. Here the developer is relieved of the UI-related common code code by using software tools, allowing him to visually design the flow of data and events between the various elements of the applications (widgets and models), and automatically generate the application code, where code generation can be customized to use one of the available plugged programming languages (Java, Python, JS, …).

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB137

Export •

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

THPVA019

Self-consistent Space Charge Tracking Method based on Lie Transform

4454

E. Laface, J.F. Esteban Müller
ESS, Lund, Sweden

In this paper we propose to describe the self-force of a particles beam, known as space charge, as an Hamiltonan term dependent on the distribution of the particles' coordinates: H_sc = H_sc(ρ(x,y,z)). This Hamiltonian is then used, together with the kinetic component H_k in a Lie transform to generate a transport map by e^{-L:H_k +H_sc}: where the Lie operator :H_k + H_sc: is defined according to the Dragt's notation [1]. Then the Lie transform is used to transport directly the distribution function ρ(x, y, z) in a self-consistent iterative algorithm. The result of this proof-of-concept idea is verified on a drift space and on a FODO channel and compared with a traditional multi-particles simulation code.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA019

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

THPVA093

Open XAL Status Report 2017

4676

A.P. Zhukov, C.K. Allen, A.P. Shishlo
ORNL, Oak Ridge, Tennessee, USA
D.A. Brown
NMSU, Las Cruces, New Mexico, USA
Y.-C. Chao
SLAC, Menlo Park, California, USA
C.P. Chu, Y. Li
IHEP, Beijing, People's Republic of China
J.F. Esteban Müller, B.T. Folsom, E. Laface, Y.I. Levinsen, C. Rosati
ESS, Lund, Sweden
P. Gillette, P. Laurent, E. Lécorché, G. Normand
GANIL, Caen, France
I. List, M. Pavleski
Cosylab, Ljubljana, Slovenia
X.H. Lu
CSNS, Guangdong Province, People's Republic of China
J.E. Muller
CERN, Geneva, Switzerland

The Open XAL accelerator physics software platform is being developed through an international collaboration among several facilities since 2010 The goal of the collaboration is to establish Open XAL as a multi-purpose software platform supporting a broad range of tool and application development in accelerator physics (Open XAL also ships with a suite of general purpose accelerator applications). This paper discusses progress in beam dynamics simulation, interaction with control system and software organization. We present the current status of the project, a roadmap for continued development and an overview of the project status at each participating facility.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA093

Export •

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