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

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1609053
Alternate Identifier(s):
OSTI ID: 1703472
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 962; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; muon source; nonintrusive beam extraction; laser neutralization; photodetachment; laser application; Spallation Neutron Source

Citation Formats

Liu, Yun, Abudureyimu, Abdurahim Rakhman, Long, Cary D., Liu, Yuan, and Williams, Travis J.. Laser-assisted high-energy proton pulse extraction for feasibility study of co-located muon source at the SNS. United States: N. p., 2020. Web. https://doi.org/10.1016/j.nima.2020.163706.
Liu, Yun, Abudureyimu, Abdurahim Rakhman, Long, Cary D., Liu, Yuan, & Williams, Travis J.. Laser-assisted high-energy proton pulse extraction for feasibility study of co-located muon source at the SNS. United States. https://doi.org/10.1016/j.nima.2020.163706
Liu, Yun, Abudureyimu, Abdurahim Rakhman, Long, Cary D., Liu, Yuan, and Williams, Travis J.. Thu . "Laser-assisted high-energy proton pulse extraction for feasibility study of co-located muon source at the SNS". United States. https://doi.org/10.1016/j.nima.2020.163706. https://www.osti.gov/servlets/purl/1609053.
@article{osti_1609053,
title = {Laser-assisted high-energy proton pulse extraction for feasibility study of co-located muon source at the SNS},
author = {Liu, Yun and Abudureyimu, Abdurahim Rakhman and Long, Cary D. and Liu, Yuan and Williams, Travis J.},
abstractNote = {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.},
doi = {10.1016/j.nima.2020.163706},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 962,
place = {United States},
year = {2020},
month = {2}
}

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