Laser-assisted charge exchange as an atomic yardstick for proton beam energy measurement and phase probe calibration

Jonathan C. Wong; Alexander Aleksandrov; Sarah Cousineau; Timofey Gorlov; Yun Liu; Abdurahim Rakhman; Andrei Shishlo

doi:10.1103/PhysRevAccelBeams.24.032801

Laser-assisted charge exchange as an atomic yardstick for proton beam energy measurement and phase probe calibration

Jonathan C. Wong, Alexander Aleksandrov, Sarah Cousineau, Timofey Gorlov, Yun Liu, Abdurahim Rakhman, Andrei Shishlo

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

2 Scopus citations

Abstract

Laser-assisted charge exchange (LACE) is a novel scheme for injecting H- ions into proton rings. Lorentz stripping of H- ions into bare protons in magnetic dipoles is enabled by laser excitation that reduces the electron binding energy. We show that such atomic transitions impose very precise requirements on ion and laser parameters which can be utilized to measure the ion velocity. At the LACE experimental station at the Spallation Neutron Source (SNS), proton beam energy has been measured via LACE to a precision of <1 MeV for a ≈1 GeV beam. To verify the results against the existing energy measurement method at the SNS which calculates revolution frequency in the accumulator ring, we discuss how knowledge of the beam energy can be employed to synchronize phase probes. Such beam-based calibration using energy measurements via both LACE and the SNS ring show that the two methods produce consistent results.

Original language	English
Article number	032801
Journal	Physical Review Accelerators and Beams
Volume	24
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevAccelBeams.24.032801
State	Published - Mar 11 2021

Funding

We are grateful to Jeffrey Holmes and Willem Blokland from Oak Ridge National Laboratory for their support on calculations of the beam’s path length and revolution frequency in the SNS accumulator ring respectively. We thank Martin Kay from University of Tennessee for providing the errors on the laser angle in the SNS LACE experiment. This research used resources of the Spallation Neutron Source, which is a DOE Office of Science User Facility. This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy (DOE). The U.S. government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for U.S. government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan .

Funders	Funder number
U.S. Department of Energy

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10.1103/PhysRevAccelBeams.24.032801

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abstract = "Laser-assisted charge exchange (LACE) is a novel scheme for injecting H- ions into proton rings. Lorentz stripping of H- ions into bare protons in magnetic dipoles is enabled by laser excitation that reduces the electron binding energy. We show that such atomic transitions impose very precise requirements on ion and laser parameters which can be utilized to measure the ion velocity. At the LACE experimental station at the Spallation Neutron Source (SNS), proton beam energy has been measured via LACE to a precision of <1 MeV for a ≈1 GeV beam. To verify the results against the existing energy measurement method at the SNS which calculates revolution frequency in the accumulator ring, we discuss how knowledge of the beam energy can be employed to synchronize phase probes. Such beam-based calibration using energy measurements via both LACE and the SNS ring show that the two methods produce consistent results.",

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AU - Rakhman, Abdurahim

AU - Shishlo, Andrei

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AB - Laser-assisted charge exchange (LACE) is a novel scheme for injecting H- ions into proton rings. Lorentz stripping of H- ions into bare protons in magnetic dipoles is enabled by laser excitation that reduces the electron binding energy. We show that such atomic transitions impose very precise requirements on ion and laser parameters which can be utilized to measure the ion velocity. At the LACE experimental station at the Spallation Neutron Source (SNS), proton beam energy has been measured via LACE to a precision of <1 MeV for a ≈1 GeV beam. To verify the results against the existing energy measurement method at the SNS which calculates revolution frequency in the accumulator ring, we discuss how knowledge of the beam energy can be employed to synchronize phase probes. Such beam-based calibration using energy measurements via both LACE and the SNS ring show that the two methods produce consistent results.

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Laser-assisted charge exchange as an atomic yardstick for proton beam energy measurement and phase probe calibration

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