IPAC2015 - List of Authors (Chu, P.)

Paper	Title	Page
MOPWI025	Phase and Amplitude Tuning Algorithms for the FRIB Superconducting Cavities	1207
	Y. Zhang, P. Chu, Z.Q. He FRIB, East Lansing, Michigan, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 FRIB driver linac will deliver all heavy ion beams up to uranium with energy above 200 MeV/u, and maximum beam power on target 400 kW for nuclear physics research. Phase and amplitude tuning of the FRIB superconducting cavities – totally about 330 of them, are important to the linac beam commissioning at low power and normal operation at high power. Because relatively low beam energy and high acceleration gradient, beam velocity changes significantly in the cavity RF gaps and the beam bunch cannot preserve perfectly in the further downstream beam diagnostics systems, beam longitudinal tuning algorithms are studied for different FRIB cavities and at different beam energy, which include the acceleration cavities as well as the re-buncher cavities.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI025
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MOPWI026	Transverse Matching of Horizontal-Vertical Coupled Beams for the FRIB Linac	1211
	Y. Zhang, P. Chu, Z.Q. He, S.M. Lund, D.G. Maxwell FRIB, East Lansing, Michigan, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 FRIB driver linac will deliver all heavy ion beams up to uranium with energy above 200 MeV/u, and maximum beam power on target 400 kW for nuclear physics research. Strong horizontal-vertical beam coupling exists in the FRIB linac since superconducting solenoids are applied to focus multi charge state beams. Further, the FRIB low beta SRF cavities have raised quadrupole field components. The combined effects make beam transverse matching challenging. In this paper, we study transverse matching of horizontal-vertical coupled beams based on beam profile measurements with multiple wire scanners. There are multiple solutions for the initial linac beams with coupling, and errors of the beam diagnostics and magnet power supplies introduce further complication. Nonetheless, simulation studies show that satisfactory transverse matching can be achieved with proper linac beam tuning.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI026
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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

Phase and Amplitude Tuning Algorithms for the FRIB Superconducting Cavities

1207

Y. Zhang, P. Chu, Z.Q. He
FRIB, East Lansing, Michigan, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
FRIB driver linac will deliver all heavy ion beams up to uranium with energy above 200 MeV/u, and maximum beam power on target 400 kW for nuclear physics research. Phase and amplitude tuning of the FRIB superconducting cavities – totally about 330 of them, are important to the linac beam commissioning at low power and normal operation at high power. Because relatively low beam energy and high acceleration gradient, beam velocity changes significantly in the cavity RF gaps and the beam bunch cannot preserve perfectly in the further downstream beam diagnostics systems, beam longitudinal tuning algorithms are studied for different FRIB cavities and at different beam energy, which include the acceleration cavities as well as the re-buncher cavities.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI025

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

MOPWI026

Transverse Matching of Horizontal-Vertical Coupled Beams for the FRIB Linac

1211

Y. Zhang, P. Chu, Z.Q. He, S.M. Lund, D.G. Maxwell
FRIB, East Lansing, Michigan, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
FRIB driver linac will deliver all heavy ion beams up to uranium with energy above 200 MeV/u, and maximum beam power on target 400 kW for nuclear physics research. Strong horizontal-vertical beam coupling exists in the FRIB linac since superconducting solenoids are applied to focus multi charge state beams. Further, the FRIB low beta SRF cavities have raised quadrupole field components. The combined effects make beam transverse matching challenging. In this paper, we study transverse matching of horizontal-vertical coupled beams based on beam profile measurements with multiple wire scanners. There are multiple solutions for the initial linac beams with coupling, and errors of the beam diagnostics and magnet power supplies introduce further complication. Nonetheless, simulation studies show that satisfactory transverse matching can be achieved with proper linac beam tuning.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI026

Export •

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)