Laser wire beam profile monitor in the spallation neutron source (SNS) superconducting linac

Y. Liu; A. Aleksandrov; S. Assadi; W. Blokland; C. Deibele; W. Grice; C. Long; T. Pelaia; A. Webster

doi:10.1016/j.nima.2009.10.061

Laser wire beam profile monitor in the spallation neutron source (SNS) superconducting linac

Y. Liu, A. Aleksandrov, S. Assadi, W. Blokland, C. Deibele, W. Grice, C. Long, T. Pelaia, A. Webster

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

The spallation neutron source (SNS) at Oak Ridge National Laboratory is an accelerator-based, neutron-scattering facility. SNS uses a large-scale, high-energy superconducting linac (SCL) to provide high beam power utilizing hydrogen ion (H^-) beams. For the diagnostics of high-brightness H^- beams in the SCL, nonintrusive methods are preferred. This paper describes design, implementation, theoretical analysis, and experimental demonstration of a nonintrusive profile monitor system based on photodetachment, also known as laser wire, installed in the SNS SCL. The SNS laser wire system is the world's largest of its kind with a capability of measuring horizontal and vertical profiles of an operational H^- beam at each of the 23 cryomodule stations along the SCL beam line by employing a single light source. Presently 9 laser wire stations have been commissioned that measure profiles of the H^- beam at energy levels from 200 MeV to 1 GeV. The laser wire diagnostics has no moving parts inside the beam pipe, causes no contamination on the superconducting cavity, and can be run parasitically on an operational neutron production H^- beam.

Original language	English
Pages (from-to)	241-253
Number of pages	13
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	612
Issue number	2
DOIs	https://doi.org/10.1016/j.nima.2009.10.061
State	Published - Jan 1 2010
Externally published	Yes

Funding

The authors thank members of the Beam Instrumentation, Accelerator Physics, and Operations Groups at the SNS Research Accelerator Division for their discussions and technical support. Ted Hunter is acknowledged for providing the information about the magnet design. We are also grateful to Norbert Holtkamp and Stuart Henderson for their support of this project. Oak Ridge National Laboratory is managed by UT Battelle, LLC for the US Department of Energy under Contract no. DE-AC05-00OR22725 .

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725
UT-Battelle

Keywords

Beam diagnostics
Beam profile monitor
Laser wire
Photodetachment
Spallation neutron source
Superconducting linac

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10.1016/j.nima.2009.10.061

Cite this

Liu, Y., Aleksandrov, A., Assadi, S., Blokland, W., Deibele, C., Grice, W., Long, C., Pelaia, T., & Webster, A. (2010). Laser wire beam profile monitor in the spallation neutron source (SNS) superconducting linac. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 612(2), 241-253. https://doi.org/10.1016/j.nima.2009.10.061

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title = "Laser wire beam profile monitor in the spallation neutron source (SNS) superconducting linac",

abstract = "The spallation neutron source (SNS) at Oak Ridge National Laboratory is an accelerator-based, neutron-scattering facility. SNS uses a large-scale, high-energy superconducting linac (SCL) to provide high beam power utilizing hydrogen ion (H-) beams. For the diagnostics of high-brightness H- beams in the SCL, nonintrusive methods are preferred. This paper describes design, implementation, theoretical analysis, and experimental demonstration of a nonintrusive profile monitor system based on photodetachment, also known as laser wire, installed in the SNS SCL. The SNS laser wire system is the world's largest of its kind with a capability of measuring horizontal and vertical profiles of an operational H- beam at each of the 23 cryomodule stations along the SCL beam line by employing a single light source. Presently 9 laser wire stations have been commissioned that measure profiles of the H- beam at energy levels from 200 MeV to 1 GeV. The laser wire diagnostics has no moving parts inside the beam pipe, causes no contamination on the superconducting cavity, and can be run parasitically on an operational neutron production H- beam.",

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Liu, Y, Aleksandrov, A, Assadi, S, Blokland, W , Deibele, C , Grice, W , Long, C, Pelaia, T & Webster, A 2010, 'Laser wire beam profile monitor in the spallation neutron source (SNS) superconducting linac', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 612, no. 2, pp. 241-253. https://doi.org/10.1016/j.nima.2009.10.061

Laser wire beam profile monitor in the spallation neutron source (SNS) superconducting linac. / Liu, Y.; Aleksandrov, A.; Assadi, S. et al.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 612, No. 2, 01.01.2010, p. 241-253.

Research output: Contribution to journal › Article › peer-review

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T1 - Laser wire beam profile monitor in the spallation neutron source (SNS) superconducting linac

AU - Liu, Y.

AU - Aleksandrov, A.

AU - Assadi, S.

AU - Blokland, W.

AU - Deibele, C.

AU - Grice, W.

AU - Long, C.

AU - Pelaia, T.

AU - Webster, A.

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N2 - The spallation neutron source (SNS) at Oak Ridge National Laboratory is an accelerator-based, neutron-scattering facility. SNS uses a large-scale, high-energy superconducting linac (SCL) to provide high beam power utilizing hydrogen ion (H-) beams. For the diagnostics of high-brightness H- beams in the SCL, nonintrusive methods are preferred. This paper describes design, implementation, theoretical analysis, and experimental demonstration of a nonintrusive profile monitor system based on photodetachment, also known as laser wire, installed in the SNS SCL. The SNS laser wire system is the world's largest of its kind with a capability of measuring horizontal and vertical profiles of an operational H- beam at each of the 23 cryomodule stations along the SCL beam line by employing a single light source. Presently 9 laser wire stations have been commissioned that measure profiles of the H- beam at energy levels from 200 MeV to 1 GeV. The laser wire diagnostics has no moving parts inside the beam pipe, causes no contamination on the superconducting cavity, and can be run parasitically on an operational neutron production H- beam.

AB - The spallation neutron source (SNS) at Oak Ridge National Laboratory is an accelerator-based, neutron-scattering facility. SNS uses a large-scale, high-energy superconducting linac (SCL) to provide high beam power utilizing hydrogen ion (H-) beams. For the diagnostics of high-brightness H- beams in the SCL, nonintrusive methods are preferred. This paper describes design, implementation, theoretical analysis, and experimental demonstration of a nonintrusive profile monitor system based on photodetachment, also known as laser wire, installed in the SNS SCL. The SNS laser wire system is the world's largest of its kind with a capability of measuring horizontal and vertical profiles of an operational H- beam at each of the 23 cryomodule stations along the SCL beam line by employing a single light source. Presently 9 laser wire stations have been commissioned that measure profiles of the H- beam at energy levels from 200 MeV to 1 GeV. The laser wire diagnostics has no moving parts inside the beam pipe, causes no contamination on the superconducting cavity, and can be run parasitically on an operational neutron production H- beam.

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Laser wire beam profile monitor in the spallation neutron source (SNS) superconducting linac

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Keywords

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