• Open Access

Simulation studies for upgrading a high-intensity surface muon beamline at Paul Scherrer Institute

Lu-Ping Zhou, Xiao-Jie Ni, Zaher Salman, Andreas Suter, Jing-Yu Tang, Vjeran Vrankovic, and Thomas Prokscha
Phys. Rev. Accel. Beams 25, 051601 – Published 9 May 2022

Abstract

The μE4-LEM beamline at Paul Scherrer Institute (PSI, Switzerland) is a special muon beamline combining the hybrid-type surface muon beamline μE4 with the low-energy muon (LEM) facility and delivers μ+ with tunable energy up to 30 keV for low-energy muon spin rotation (LE-μSR) experiments. We investigate a possible upgrade scenario for the surface muon beamline μE4 by replacing the last set of quadrupole triplets with a special solenoid to obtain 1.4 times the original beam intensity on the LEM muon moderator target. In order to avoid the muon beam intensity loss at the LEM spectrometer due to the stray magnetic field of the solenoid, three kinds of solenoid models have been explored and the stray field of the solenoid at the LEM facility is finally reduced to the magnitude of the geomagnetic field. A more radical design, “Super-μE4,” has also been investigated for further increasing the brightness of the low-energy muon beam, where we make use of the current μE4 channel and all sets of quadrupole triplets are replaced by large aperture solenoids. Together with the new slanted muon target E, at least 2.9 times the original muon beam intensity can be expected in the Super-μE4 beamline. Our work demonstrates the feasibility of upgrading surface muon beamlines by replacing quadrupole magnets with normal-conducting solenoids, resulting in higher muon rates and smaller beam spot sizes.

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  • Received 15 August 2021
  • Accepted 21 March 2022

DOI:https://doi.org/10.1103/PhysRevAccelBeams.25.051601

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Authors & Affiliations

Lu-Ping Zhou1,2,3,4,*, Xiao-Jie Ni4, Zaher Salman4, Andreas Suter4, Jing-Yu Tang1,2,3, Vjeran Vrankovic5, and Thomas Prokscha4,†

  • 1Institute of High Energy Physics, CAS, Beijing 100049, China
  • 2University of Chinese Academy of Sciences, CAS, Beijing 100049, China
  • 3Spallation Neutron Source Science Center, Dongguan 523803, China
  • 4Paul Scherrer Institute, Laboratory for Muon Spin Spectroscopy, CH-5232 Villigen PSI, Switzerland
  • 5Paul Scherrer Institute, Large Research Facilities Division, CH-5232 Villigen PSI, Switzerland

  • *zhoulp@ihep.ac.cn
  • thomas.prokscha@psi.ch

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Vol. 25, Iss. 5 — May 2022

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