Laser-assisted high-energy proton pulse extraction for feasibility study of co-located muon source at the SNS

Liu, Yun; Abudureyimu, Abdurahim Rakhman; Long, Cary D.; Liu, Yuan; Williams, Travis J.

doi:10.1016/j.nima.2020.163706

Laser-assisted high-energy proton pulse extraction for feasibility study of co-located muon source at the SNS

Journal Article · Thu Feb 27 00:00:00 EST 2020 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2020.163706· OSTI ID:1609053

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, we have experimentally demonstrated the first non-intrusive 1-GeV proton beam extraction for the generation of muons with a temporal structure optimized for Muon Spin Relaxation/Rotation/Resonance (μSR) applications. The proton pulses are extracted based on the laser neutralization of 1 GeV hydrogen ion (H^-) beam in the high energy beam transport of the Spallation Neutron Source (SNS) accelerator. The maximum flux of the extracted proton beam based on laser neutralization causes only 0.2% reduction of the total proton beam used for neutron production, a marked difference from the 20% reduction at other co-located muon and neutron facilities, and thus the proposed method will result in negligible impact on the SNS operation. This paper describes the development of a fiber/solid-state hybrid laser system that has high flexibility of pulse structure and output power, initial experiments on laser neutralization of beam and separation of H⁰ beam from the existing SNS accelerator beam line, conversion of H⁰ to proton at the SNS linac dump, and measurement results of 30 ns/50 kHz proton pulses. This system conclusively demonstrates the feasibility of laser-based proton beam extraction to power a world-leading μSR facility at the SNS.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1609053

Alternate ID(s):: OSTI ID: 1703472

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Journal Issue: C Vol. 962; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Nonintrusive measurement of time-resolved emittances of 1-GeV operational hydrogen ion beam using a laser comb Liu, Y.; Long, C.; Aleksandrov, A. Physical Review Accelerators and Beams, Vol. 23, Issue 10 https://doi.org/10.1103/physrevaccelbeams.23.102806	journal	October 2020

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Laser-assisted high-energy proton pulse extraction for feasibility study of co-located muon source at the SNS

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