IPAC2015 - List of Authors (Pelaia II, T.A.)

Paper	Title	Page
MOPHA013	Superconducting Radio Frequency Cavity Degradation Due to Errant Beam	805
	C.C. Peters, D. Curry, G.D. Johns ORNL RAD, Oak Ridge, Tennessee, USA A.V. Aleksandrov, W. Blokland, M.T. Crofford, C. Deibele, G.W. Dodson, J. Galambos, T.A. Justice, S.-H. Kim, T.A. Pelaia II, M.A. Plum, A.P. Shishlo ORNL, Oak Ridge, Tennessee, USA
	Funding: ORNL is managed by UT-Battelle, LLC, under contract DE-AC05- 00OR22725 for the U.S. Department of Energy. In 2009, the Superconducting Radio Frequency (SRF) cavities at the Spallation Neutron Source (SNS) began to experience significant operational degradation [1]. The source of the degradation was found to be repeated striking of cavity surfaces with errant beam pulses. The Machine Protection System (MPS) was designed to turn the beam off during a fault condition in less than 20 μseconds [2] as these errant beam pulses were not unexpected. Unfortunately an improperly operating MPS was not turning off the beam within the designed 20 μseconds, and the SRF cavities were being damaged. The MPS issues were corrected, and the SRF performance was restored with cavity thermal cycling and RF processing. However, the SRF cavity performance has continued to degrade, though at a reduced rate compared to 2009. This paper will detail further study of errant beam frequency, amount lost per event, causes, and the corrective actions imposed since the initial event.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPHA013
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MOPWI027	Open XAL Control Room Experience	1214
	C.P. Chu, D.G. Maxwell, Y. Zhang FRIB, East Lansing, Michigan, USA C.K. Allen, T.A. Pelaia II, A.P. Shishlo ORNL, Oak Ridge, Tennessee, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy under Cooperative Agreement DE-SC0000661 and DE-AC05-00OR22725, the State of Michigan and Michigan State University. This paper reports the control room experience, lessons learned, and quick deployment approach for the Open XAL application environment. Open XAL is a java-based framework for building high-level accelerator applications, it is a major revision of the XAL framework which was developed at the Spallation Neutron Source (SNS). Open XAL is site neutral and may be deployed at multiple accelerator facilities. Currently, Open XAL is installed at SNS and at the Re-Accelerator facility of Michigan State University. At SNS we are in the final process of replacing the old XAL environment with Open XAL; we describe the upgrade process and our accelerator operations experience using Open XAL. At Michigan State, Open XAL has been tested during a cryomodule commissioning and result will be shown.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI027
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MOPWI047	Architectural Improvements and New Processing Tools for the Open XAL Online Model	1262
	C.K. Allen, T.A. Pelaia II ORNL, Oak Ridge, Tennessee, USA J.M. Freed University of South Carolina, Columbia, USA
	Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725. The Open XAL online model is the component of Open XAL* providing accelerator modeling dynamic synchronization to live hardware. Several significant architectural enhancements and feature additions have been made concerning the handling and processing of simulation data. The major structural change is the creation of a single class Trajectory<> that manages all simulation data. Another significant design change was the development of standard tools for processing simulation results. One may obtain machine parameters such as fixed orbit, phase advance, dispersion, etc., or beam-based calculations such as RMS size and centroid location simply by passing simulation results, i.e. a Trajectory<> object, to these computation tools. Finally, the ability to fully create composite modeling elements was implemented in the online model. Specifically, accelerator hardware can be modeled as a collection of constituent modeling elements. This sub-structure capability is extremely useful for modeling RF cavities consisting of coupled RF gaps coupled and drift spaces. We present an overview of the new architecture and how it is used when building applications. * http://xaldev.sourceforge.net/
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI047
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MOPWI048	Open XAL Build System	1265
	T.A. Pelaia II ORNL, Oak Ridge, Tennessee, USA
	Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725 Open XAL is an accelerator physics software platform developed in collaboration among several facilities around the world. The build system is implemented through Apache Ant build files and features zero configuration simplicity based on directory patterns. These directory patterns allow for correctly building the Open XAL environment including the core and site specific applications, services, extensions, plugins and resources. Options are available for deployment and custom application packaging. This paper describes the Open XAL build rules, options and workflows.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI048
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MOPWI049	Open XAL Services Architecture	1267
	T.A. Pelaia II ORNL, Oak Ridge, Tennessee, USA
	Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725 Open XAL is an accelerator physics software platform developed in collaboration among several facilities around the world. It includes a powerful new services extension that allows for natural remote procedure calls. The high level services interface is based upon custom implementations of modern standard protocols such as JSON-RPC and WebSockets. This choice of modern protocols allows for flexibility such as seamless communication with web clients free of plugins plus rich object type support. The JSON parser was designed for convenient data type transformations with easy extensibility, high performance and low memory overhead. The Open XAL services architecture features a simple application programming interface, high performance, memory efficiency and thread safety.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI049
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MOPWI050	Open XAL Status Report 2015	1270
	T.A. Pelaia II, C.K. Allen, A.P. Shishlo, A.P. Zhukov ORNL, Oak Ridge, Tennessee, USA Y.-C. Chao, C. Gong, F.W. Jones, R. Newhouse TRIUMF, Vancouver, Canada P. Chu, D.G. Maxwell, Y. Zhang FRIB, East Lansing, Michigan, USA R. Fearn, L. Fernández, E. Laface, M. Muñoz ESS, Lund, Sweden J.M. Freed University of South Carolina, Columbia, USA P. Gillette, P. Laurent, G. Normand GANIL, Caen, France H.R. Hale University of Tennessee, Knoxville, USA Y. Li IHEP, Beijing, People's Republic of China I. List, M. Pavleski Cosylab, Ljubljana, Slovenia P. Scruggs East Tennessee State University, Johnson City, USA
	Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725 Open XAL is an accelerator physics software platform developed in collaboration among several facilities around the world. The Open XAL collaboration was formed in 2010 to port, improve and extend the successful XAL platform used at the Spallation Neutron Source for use in the broader accelerator community and to establish it as the standard platform for accelerator physics software. The site-independent core is complete, active applications have been ported, and now we are in the process of verification and transitioning to using Open XAL in production. This paper will present the current status and a roadmap for this project.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI050
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Paper

Title

Page

Superconducting Radio Frequency Cavity Degradation Due to Errant Beam

805

C.C. Peters, D. Curry, G.D. Johns
ORNL RAD, Oak Ridge, Tennessee, USA
A.V. Aleksandrov, W. Blokland, M.T. Crofford, C. Deibele, G.W. Dodson, J. Galambos, T.A. Justice, S.-H. Kim, T.A. Pelaia II, M.A. Plum, A.P. Shishlo
ORNL, Oak Ridge, Tennessee, USA

Funding: ORNL is managed by UT-Battelle, LLC, under contract DE-AC05- 00OR22725 for the U.S. Department of Energy.
In 2009, the Superconducting Radio Frequency (SRF) cavities at the Spallation Neutron Source (SNS) began to experience significant operational degradation [1]. The source of the degradation was found to be repeated striking of cavity surfaces with errant beam pulses. The Machine Protection System (MPS) was designed to turn the beam off during a fault condition in less than 20 μseconds [2] as these errant beam pulses were not unexpected. Unfortunately an improperly operating MPS was not turning off the beam within the designed 20 μseconds, and the SRF cavities were being damaged. The MPS issues were corrected, and the SRF performance was restored with cavity thermal cycling and RF processing. However, the SRF cavity performance has continued to degrade, though at a reduced rate compared to 2009. This paper will detail further study of errant beam frequency, amount lost per event, causes, and the corrective actions imposed since the initial event.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPHA013

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MOPWI027

Open XAL Control Room Experience

1214

C.P. Chu, D.G. Maxwell, Y. Zhang
FRIB, East Lansing, Michigan, USA
C.K. Allen, T.A. Pelaia II, A.P. Shishlo
ORNL, Oak Ridge, Tennessee, USA

Funding: This material is based upon work supported by the U.S. Department of Energy under Cooperative Agreement DE-SC0000661 and DE-AC05-00OR22725, the State of Michigan and Michigan State University.
This paper reports the control room experience, lessons learned, and quick deployment approach for the Open XAL application environment. Open XAL is a java-based framework for building high-level accelerator applications, it is a major revision of the XAL framework which was developed at the Spallation Neutron Source (SNS). Open XAL is site neutral and may be deployed at multiple accelerator facilities. Currently, Open XAL is installed at SNS and at the Re-Accelerator facility of Michigan State University. At SNS we are in the final process of replacing the old XAL environment with Open XAL; we describe the upgrade process and our accelerator operations experience using Open XAL. At Michigan State, Open XAL has been tested during a cryomodule commissioning and result will be shown.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI027

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MOPWI047

Architectural Improvements and New Processing Tools for the Open XAL Online Model

1262

C.K. Allen, T.A. Pelaia II
ORNL, Oak Ridge, Tennessee, USA
J.M. Freed
University of South Carolina, Columbia, USA

Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725.
The Open XAL online model is the component of Open XAL* providing accelerator modeling dynamic synchronization to live hardware. Several significant architectural enhancements and feature additions have been made concerning the handling and processing of simulation data. The major structural change is the creation of a single class Trajectory<> that manages all simulation data. Another significant design change was the development of standard tools for processing simulation results. One may obtain machine parameters such as fixed orbit, phase advance, dispersion, etc., or beam-based calculations such as RMS size and centroid location simply by passing simulation results, i.e. a Trajectory<> object, to these computation tools. Finally, the ability to fully create composite modeling elements was implemented in the online model. Specifically, accelerator hardware can be modeled as a collection of constituent modeling elements. This sub-structure capability is extremely useful for modeling RF cavities consisting of coupled RF gaps coupled and drift spaces. We present an overview of the new architecture and how it is used when building applications.
* http://xaldev.sourceforge.net/

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI047

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MOPWI048

Open XAL Build System

1265

T.A. Pelaia II
ORNL, Oak Ridge, Tennessee, USA

Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725
Open XAL is an accelerator physics software platform developed in collaboration among several facilities around the world. The build system is implemented through Apache Ant build files and features zero configuration simplicity based on directory patterns. These directory patterns allow for correctly building the Open XAL environment including the core and site specific applications, services, extensions, plugins and resources. Options are available for deployment and custom application packaging. This paper describes the Open XAL build rules, options and workflows.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI048

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MOPWI049

Open XAL Services Architecture

1267

T.A. Pelaia II
ORNL, Oak Ridge, Tennessee, USA

Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725
Open XAL is an accelerator physics software platform developed in collaboration among several facilities around the world. It includes a powerful new services extension that allows for natural remote procedure calls. The high level services interface is based upon custom implementations of modern standard protocols such as JSON-RPC and WebSockets. This choice of modern protocols allows for flexibility such as seamless communication with web clients free of plugins plus rich object type support. The JSON parser was designed for convenient data type transformations with easy extensibility, high performance and low memory overhead. The Open XAL services architecture features a simple application programming interface, high performance, memory efficiency and thread safety.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI049

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

MOPWI050

Open XAL Status Report 2015

1270

T.A. Pelaia II, C.K. Allen, A.P. Shishlo, A.P. Zhukov
ORNL, Oak Ridge, Tennessee, USA
Y.-C. Chao, C. Gong, F.W. Jones, R. Newhouse
TRIUMF, Vancouver, Canada
P. Chu, D.G. Maxwell, Y. Zhang
FRIB, East Lansing, Michigan, USA
R. Fearn, L. Fernández, E. Laface, M. Muñoz
ESS, Lund, Sweden
J.M. Freed
University of South Carolina, Columbia, USA
P. Gillette, P. Laurent, G. Normand
GANIL, Caen, France
H.R. Hale
University of Tennessee, Knoxville, USA
Y. Li
IHEP, Beijing, People's Republic of China
I. List, M. Pavleski
Cosylab, Ljubljana, Slovenia
P. Scruggs
East Tennessee State University, Johnson City, USA

Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725
Open XAL is an accelerator physics software platform developed in collaboration among several facilities around the world. The Open XAL collaboration was formed in 2010 to port, improve and extend the successful XAL platform used at the Spallation Neutron Source for use in the broader accelerator community and to establish it as the standard platform for accelerator physics software. The site-independent core is complete, active applications have been ported, and now we are in the process of verification and transitioning to using Open XAL in production. This paper will present the current status and a roadmap for this project.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI050

Export •

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